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712.0379
Antun Milas
Drazen Adamovic and Antun Milas
The N=1 triplet vertex operator superalgebras
53 pages; v2: references added; v3: a few changes; v4: final version, to appear in CMP
Commun.Math.Phys.288:225-270,2009
10.1007/s00220-009-0735-2
null
math.QA hep-th math-ph math.MP math.RT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce a new family of C_2-cofinite N=1 vertex operator superalgebras SW(m), $m \geq 1$, which are natural super analogs of the triplet vertex algebra family W(p), $p \geq 2$, important in logarithmic conformal field theory. We classify irreducible SW(m)-modules and discuss logarithmic modules. We also compute bosonic and fermionic formulas of irreducible SW(m) characters. Finally, we contemplate possible connections between the category of SW(m)-modules and the category of modules for the quantum group U^{small}_q(sl_2), q=e^{\frac{2 \pi i}{2m+1}}, by focusing primarily on properties of characters and the Zhu's algebra A(SW(m)). This paper is a continuation of arXiv:0707.1857.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 20:53:16 GMT" }, { "version": "v2", "created": "Wed, 19 Dec 2007 14:48:08 GMT" }, { "version": "v3", "created": "Thu, 31 Jan 2008 19:10:54 GMT" }, { "version": "v4", "created": "Tue, 11 Nov 2008 19:38:53 GMT" } ]
2009-04-17T00:00:00
[ [ "Adamovic", "Drazen", "" ], [ "Milas", "Antun", "" ] ]
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712.038
Edmund Meyer
Edmund Meyer and John Bohn
Influence of a humidor on the aerodynamics of baseballs
21 pages, 7 figures, modified and re-posted 2/29
null
10.1119/1.2955796
null
physics.pop-ph physics.gen-ph
null
We investigate whether storing baseballs in a controlled humidity environment significantly affects their aerodynamic properties. To do this, we measure the change in diameter and mass of baseballs as a function of relative humidity (RH) in which the balls are stored. We then model trajectories for pitched and batted baseballs to assess the difference between those stored at 30% RH versus 50% RH. The results show that a drier baseball may be expected to curve slightly more than a humidified one for a given pitch velocity. We also find that the aerodynamics alone would add ~2 feet to the distance a moister ball is hit. However, this is compensated by a ~6 foot reduction in batted distance due to the well known change in coefficient of restitution of the ball. We discuss consequences of these results for baseball played at Coors Field in Denver, where baseballs have been stored in a humidor at 50% RH since 2002.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 20:58:57 GMT" }, { "version": "v2", "created": "Fri, 29 Feb 2008 22:46:09 GMT" } ]
2009-11-13T00:00:00
[ [ "Meyer", "Edmund", "" ], [ "Bohn", "John", "" ] ]
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712.0381
Ben Loer
C. Galbiati, R. Purtschert, et. al
Discovery of underground argon with low level of radioactive 39Ar and possible applications to WIMP dark matter detectors
6 pages, 2 figures, 2 tables
J.Phys.Conf.Ser.120:042015,2008
10.1088/1742-6596/120/4/042015
null
astro-ph
null
We report on the first measurement of 39Ar in argon from underground natural gas reservoirs. The gas stored in the US National Helium Reserve was found to contain a low level of 39Ar. The ratio of 39Ar to stable argon was found to be <=4x10-17 (84% C.L.), less than 5% the value in atmospheric argon (39Ar/Ar=8x10-16). The total quantity of argon currently stored in the National Helium Reserve is estimated at 1000 tons. 39Ar represents one of the most important backgrounds in argon detectors for WIMP dark matter searches. The findings reported demonstrate the possibility of constructing large multi-ton argon detectors with low radioactivity suitable for WIMP dark matter searches.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 20:59:47 GMT" } ]
2009-06-23T00:00:00
[ [ "Galbiati", "C.", "" ], [ "Purtschert", "R.", "" ] ]
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712.0382
Johnpierre Paglione
Johnpierre Paglione, P.-C. Ho, M. B. Maple, M. A. Tanatar, Louis Taillefer, Y. Lee, C. Petrovic
Ambient-pressure bulk superconductivity deep in the magnetic state of CeRhIn5
4 pages, 4 figures
Phys. Rev. B 77, 100505(R) (2008)
10.1103/PhysRevB.77.100505
null
cond-mat.supr-con cond-mat.str-el
null
Specific heat, magnetic susceptibility and electrical transport measurements were performed at ambient pressure on high-quality single crystal specimens of CeRhIn5 down to ultra-low temperatures. We report signatures of an anomaly observed in all measured quantities consistent with a bulk phase transition to a superconducting state at T_c=110 mK. Occurring far below the onset of antiferromagnetism at T_N=3.8 K, this transition appears to involve a significant portion of the available low-temperature density of electronic states, exhibiting an entropy change in line with that found in other members of the 115 family of superconductors tuned away from quantum criticality.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 21:00:02 GMT" } ]
2008-03-18T00:00:00
[ [ "Paglione", "Johnpierre", "" ], [ "Ho", "P. -C.", "" ], [ "Maple", "M. B.", "" ], [ "Tanatar", "M. A.", "" ], [ "Taillefer", "Louis", "" ], [ "Lee", "Y.", "" ], [ "Petrovic", "C.", "" ] ]
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712.0383
Cheng Li
Cheng Li, Guinevere Kauffmann, Timothy M. Heckman, Simon D. M. White, Y. P. Jing
Interactions, star formation and AGN activity
v1: 10 pages, 9 figures, submitted for publication in Monthly Notices; v2: accepted, minor changes in summary and reference list updated
null
10.1111/j.1365-2966.2008.13023.x
null
astro-ph
null
It has long been known that galaxy interactions are associated with enhanced star formation. In a companion paper, we explored this connection by applying a variety of statistics to SDSS data. In particular, we showed that specific star formation rates of galaxies are higher if they have close neighbours. Here we apply exactly the same techniques to AGN in the survey, showing that close neighbours are not associated with any similar enhancement of nuclear activity. Star formation is enhanced in AGN with close neighbours in exactly the same way as in inactive galaxies, but the accretion rate onto the black hole, as estimated from the extinction-corrected [O III] luminosity, is not influenced by the presence or absence of companions. Previous work has shown that galaxies with more strongly accreting black holes contain more young stars in their inner regions. This leads us to conclude that star formation induced by a close companion and star formation associated with black hole accretion are distinct events. These events may be part of the same physical process, for example a merger, provided they are separated in time. In this case, accretion onto the black hole and its associated star formation would occur only after the two interacting galaxies have merged. The major caveat in this work is our assumption that the extinction-corrected [O III] luminosity is a robust indicator of the bolometric luminosity of the central black hole. It is thus important to check our results using indicators of AGN activity at other wavelengths.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 09:50:15 GMT" }, { "version": "v2", "created": "Fri, 25 Jan 2008 21:49:28 GMT" } ]
2009-11-13T00:00:00
[ [ "Li", "Cheng", "" ], [ "Kauffmann", "Guinevere", "" ], [ "Heckman", "Timothy M.", "" ], [ "White", "Simon D. M.", "" ], [ "Jing", "Y. P.", "" ] ]
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712.0384
Eduardo Gonz\'alez-Solares Dr
E. A. Gonzalez-Solares, N. A. Walton, R. Greimel, J. E. Drew, M. J. Irwin, S. E. Sale, K. Andrews, A. Aungwerojwit, M. J. Barlow, E. van den Besselaar, R. L. M. Corradi, B. T. Gaensicke, P. J. Groot, A. S. Hales, E. C. Hopewell, H. Hu, J. Irwin, C. Knigge, E. Lagadec, P. Leisy, J. R. Lewis, A. Mampaso, M. Matsuura, B. Moont, L. Morales-Rueda, R. A. H. Morris, T. Naylor, Q. A. Parker, P. Prema, S. Pyrzas, G. T. Rixon, P. Rodriguez-Gil, G. Roelofs, L. Sabin, I. Skillen, J. Suso, R. Tata, K. Viironen, J. S. Vink, A. Witham, N. J. Wright, A. A. Zijlstra, A. Zurita, J. Drake, J. Fabregat, D. J. Lennon, P. W. Lucas, E. L. Martin, D. Steeghs, Y. C. Unruh
Initial Data Release from the INT Photometric H-alpha Survey of the Northern Galactic Plane (IPHAS)
17 pages, 23 figures, MNRAS in press. Version with full-resolution figures can be found at http://casu.ast.cam.ac.uk/surveys-projects/iphas
null
10.1111/j.1365-2966.2008.13399.x
null
astro-ph
null
The INT/WFC Photometric H-alpha Survey of the Northern Galactic Plane (IPHAS) is an imaging survey being carried out in H-alpha, r' and i' filters, with the Wide Field Camera (WFC) on the 2.5-metre Isaac Newton Telescope (INT) to a depth of r'=20 (10 sigma). The survey is aimed at revealing large scale structure in our local galaxy, and also the properties of key early and late populations making up the Milky Way. Mapping emission line objects enables a particular focus on objects in the young and old stages of stellar evolution ranging from early T-Tauri stars to late planetary nebulae. In this paper we present the IPHAS Initial Data Release, primarily a photometric catalogue of about 200 million unique objects, coupled with associated image data covering about 1600 square degrees in three passbands. We note how access to the primary data products has been implemented through use of standard virtual observatory publishing interfaces. Simple traditional web access is provided to the main IPHAS photometric catalogue, in addition to a number of common catalogues (such as 2MASS) which are of immediate relevance. Access through the AstroGrid VO Desktop opens up the full range of analysis options, and allows full integration with the wider range of data and services available through the Virtual Observatory. The IDR represents the largest dataset published primarily through VO interfaces to date, and so stands as an examplar of the future of survey data mining. Examples of data access are given, including a cross-matching of IPHAS photometry with sources in the UKIDSS Galactic Plane Survey that validates the existing calibration of the best data.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 21:00:35 GMT" }, { "version": "v2", "created": "Thu, 8 May 2008 11:18:56 GMT" } ]
2009-11-13T00:00:00
[ [ "Gonzalez-Solares", "E. A.", "" ], [ "Walton", "N. A.", "" ], [ "Greimel", "R.", "" ], [ "Drew", "J. E.", "" ], [ "Irwin", "M. J.", "" ], [ "Sale", "S. E.", "" ], [ "Andrews", "K.", "" ], [ "Aungwerojwit", "A.", "" ], [ "Barlow", "M. J.", "" ], [ "Besselaar", "E. van den", "" ], [ "Corradi", "R. L. M.", "" ], [ "Gaensicke", "B. T.", "" ], [ "Groot", "P. J.", "" ], [ "Hales", "A. S.", "" ], [ "Hopewell", "E. C.", "" ], [ "Hu", "H.", "" ], [ "Irwin", "J.", "" ], [ "Knigge", "C.", "" ], [ "Lagadec", "E.", "" ], [ "Leisy", "P.", "" ], [ "Lewis", "J. R.", "" ], [ "Mampaso", "A.", "" ], [ "Matsuura", "M.", "" ], [ "Moont", "B.", "" ], [ "Morales-Rueda", "L.", "" ], [ "Morris", "R. A. H.", "" ], [ "Naylor", "T.", "" ], [ "Parker", "Q. A.", "" ], [ "Prema", "P.", "" ], [ "Pyrzas", "S.", "" ], [ "Rixon", "G. T.", "" ], [ "Rodriguez-Gil", "P.", "" ], [ "Roelofs", "G.", "" ], [ "Sabin", "L.", "" ], [ "Skillen", "I.", "" ], [ "Suso", "J.", "" ], [ "Tata", "R.", "" ], [ "Viironen", "K.", "" ], [ "Vink", "J. S.", "" ], [ "Witham", "A.", "" ], [ "Wright", "N. J.", "" ], [ "Zijlstra", "A. A.", "" ], [ "Zurita", "A.", "" ], [ "Drake", "J.", "" ], [ "Fabregat", "J.", "" ], [ "Lennon", "D. J.", "" ], [ "Lucas", "P. W.", "" ], [ "Martin", "E. L.", "" ], [ "Steeghs", "D.", "" ], [ "Unruh", "Y. C.", "" ] ]
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712.0385
Kazuya Koyama
Olindo Corradini, Kazuya Koyama and Gianmassimo Tasinato
Induced gravity on intersecting brane-worlds Part I: Maximally symmetric solutions
16 pages, some mistakes in the identification of the higher codimensional singular structure corrected. Main results unchanged
Phys.Rev.D77:084006,2008
10.1103/PhysRevD.77.084006
null
hep-th astro-ph gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We explore models of intersecting brane-worlds with induced gravity terms on codimension one branes and on their intersection. Maximally symmetric solutions for the branes and the intersection are found. We find new self-accelerating solutions. In a 6d spacetime, the solutions realize the see-saw modification of gravity where the UV scale of the modification to 4d gravity is determined by 6d Planck scale given by $M_6 \sim 10^{-3}$eV and the IR scale of the modification is determined by $M_6^2/M_4 \sim H_0 \sim 10^{-42}$ GeV where $H_0$ is present-day Hubble scale. We find that it is increasingly difficult to construct phenomenologically viable models in higher-dimensional spacetime due to the necessity to have the lower value for the fundamental Planck scale to realize the late time acceleration. It is found that the system also admits self-tuning solutions where the tension at the intersection does not change the geometry of the intersection. The induced gravity terms can avoid the necessity to compactify the extra dimensions. Finally, we discuss the possibility to have ordinary matter at the intersection, without introducing any regularisation, using the induced gravity terms.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 21:13:29 GMT" }, { "version": "v2", "created": "Wed, 12 Mar 2008 21:08:10 GMT" }, { "version": "v3", "created": "Tue, 21 Oct 2008 13:42:28 GMT" } ]
2008-11-26T00:00:00
[ [ "Corradini", "Olindo", "" ], [ "Koyama", "Kazuya", "" ], [ "Tasinato", "Gianmassimo", "" ] ]
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712.0386
Luis Anchordoqui
Luis A. Anchordoqui, Haim Goldberg, Satoshi Nawata, Tomasz R. Taylor
Jet signals for low mass strings at the LHC
Matching version to be published in Phys. Rev. Lett
Phys.Rev.Lett.100:171603,2008
10.1103/PhysRevLett.100.171603
MPP-2007-182; NUB-Th-3261
hep-ph hep-th
null
The mass scale M_s of superstring theory is an arbitrary parameter that can be as low as few TeVs if the Universe contains large extra dimensions. We propose a search for the effects of Regge excitations of fundamental strings at LHC, in the process p p \to \gamma jet. The underlying parton process is dominantly the single photon production in gluon fusion, g g \to \gamma g, with open string states propagating in intermediate channels. If the photon mixes with the gauge boson of the baryon number, which is a common feature of D-brane quivers, the amplitude appears already at the string disk level. It is completely determined by the mixing parameter -- and it is otherwise model-(compactification-) independent. Even for relatively small mixing, 100 fb^{-1} of LHC data could probe deviations from standard model physics, at a 5\sigma significance, for M_s as large as 3.3 TeV.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 20:07:44 GMT" }, { "version": "v2", "created": "Wed, 2 Apr 2008 01:22:57 GMT" }, { "version": "v3", "created": "Tue, 22 Apr 2008 15:09:09 GMT" } ]
2008-11-26T00:00:00
[ [ "Anchordoqui", "Luis A.", "" ], [ "Goldberg", "Haim", "" ], [ "Nawata", "Satoshi", "" ], [ "Taylor", "Tomasz R.", "" ] ]
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712.0387
Ivan Ramirez
I. Ramirez, C. Allende Prieto, D. L. Lambert, M. Asplund
Signatures of Granulation in the Spectra of K-Dwarfs
To appear in Proceedings of the Bash Symposium 2007 "New Horizons in Astronomy", 14-16 Oct. 2007; eds. A. Frebel, J. Maund, J. Shen, M. Siegel; ASP conference series
null
null
null
astro-ph
null
Very high resolution (R>150,000) spectra of a small sample of nearby K-dwarfs have been acquired to measure the line asymmetries and central wavelength shifts caused by convective motions present in stellar photospheres. This phenomenon of granulation is modeled by 3D hydrodynamical simulations but they need to be confronted with accurate observations to test their realism before they are used in stellar abundance studies. We find that the line profiles computed with a 3D model agree reasonably well with the observations. The line bisectors and central wavelength shifts on K-dwarf spectra have a maximum amplitude of only about 200 m/s and we have been able to resolve these granulation effects with a very careful observing strategy. By computing a number of iron lines with 1D and 3D models (assuming local thermodynamic equilibrium), we find that the impact of 3D-LTE effects on classical iron abundance determinations is negligible.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 21:15:20 GMT" } ]
2007-12-05T00:00:00
[ [ "Ramirez", "I.", "" ], [ "Prieto", "C. Allende", "" ], [ "Lambert", "D. L.", "" ], [ "Asplund", "M.", "" ] ]
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712.0388
Richard Alexander
Richard Alexander
From discs to planetesimals I: evolution of gas and dust discs
28 pages, 9 figures. Refereed review chapter for proceedings of VLTI summer school on "Circumstellar discs and planets at very high angular resolution", to appear in New Astronomy Reviews. See http://www.vlti.org/ for more details
NewAstron.Rev.52:60-77,2008
10.1016/j.newar.2008.04.004
null
astro-ph
null
I review the processes that shape the evolution of protoplanetary discs around young, solar-mass stars. I first discuss observations of protoplanetary discs, and note in particular the constraints these observations place on models of disc evolution. The processes that affect the evolution of gas discs are then discussed, with the focus in particular on viscous accretion and photoevaporation, and recent models which combine the two. I then discuss the dynamics and growth of dust grains in discs, considering models of grain growth, the gas-grain interaction and planetesimal formation, and review recent research in this area. Lastly, I consider the so-called "transitional" discs, which are thought to be observed during disc dispersal. Recent observations and models of these systems are reviewed, and prospects for using statistical surveys to distinguish between the various proposed models are discussed.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 21:02:08 GMT" } ]
2008-11-26T00:00:00
[ [ "Alexander", "Richard", "" ] ]
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712.0389
Andrea Kunder
Andrea Kunder, Piotr Popowski, Kem H. Cook, Brian Chaboyer
The Extinction Toward the Galactic Bulge from RR Lyrae Stars
4 Figures, accepted to AJ
null
10.1088/0004-6256/135/2/631
null
astro-ph
null
We present mean reddenings toward 3525 RR0 Lyrae stars from the Galactic bulge fields of the MACHO Survey. These reddenings are determined using the color at minimum $V$-band light of the RR0 Lyrae stars themselves and are found to be in general agreement with extinction estimates at the same location obtained from other methods. Using 3256 stars located in the Galactic Bulge, we derive the selective extinction coefficient $R_{V,VR}=A_V/E(V-R) = 4.3 \pm 0.2$. This value is what is expected for a standard extinction law with $R_{V,BV} = 3.1 \pm 0.3$.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 21:08:46 GMT" } ]
2009-11-13T00:00:00
[ [ "Kunder", "Andrea", "" ], [ "Popowski", "Piotr", "" ], [ "Cook", "Kem H.", "" ], [ "Chaboyer", "Brian", "" ] ]
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712.039
Alexios P. Polychronakos
Justo Lopez-Sarrion, Alexios P. Polychronakos
Noncommutative Wess-Zumino-Witten actions and their Seiberg-Witten invariance
Version to appear in Nuclear Physics B
Nucl.Phys.B799:291-305,2008
10.1016/j.nuclphysb.2008.01.011
CCNY-HEP-07/06
hep-th
null
We analyze the noncommutative two-dimensional Wess-Zumino-Witten model and its properties under Seiberg-Witten transformations in the operator formulation. We prove that the model is invariant under such transformations even for the noncritical (non chiral) case, in which the coefficients of the kinetic and Wess-Zumino terms are not related. The pure Wess-Zumino term represents a singular case in which this transformation fails to reach a commutative limit. We also discuss potential implications of this result for bosonization.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 21:16:33 GMT" }, { "version": "v2", "created": "Wed, 20 Feb 2008 15:48:56 GMT" } ]
2008-11-26T00:00:00
[ [ "Lopez-Sarrion", "Justo", "" ], [ "Polychronakos", "Alexios P.", "" ] ]
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712.0391
Jose Albornoz
Jos\'e M. Albornoz, Antonio Parravano
Modeling a simple enzyme reaction with delay and discretization
13 pages, 7 figures. Submitted to Journal of Theoretical Biology
null
null
null
q-bio.MN q-bio.QM
null
A comparison is made between conventional Michaelis-Menten kinetics and two models that take into account the duration of the conformational changes that take place at the molecular level during the catalytic cycle of a monomer. The models consider the time that elapses from the moment an enzyme-substrate complex forms until the moment a product molecule is released, as well as the recovery time needed to reset the conformational change that took place. In the first model the dynamics is described by a set of delayed differential equations, instead of the ordinary differential equations associated to Michaelis-Menten kinetics. In the second model the delay, the discretization inherent to enzyme reactions and the stochastic binding of substrates to enzimes at the molecular level is considered. All three models agree at equilibrium, as expected; however, out-of-equilibrium dynamics can differ substantially. In particular, both delayed models show oscillations at low values of the Michaelis constant which are not reproduced by the Michaelis-Menten model. Additionally, in certain cases, the dynamics shown by the continuous delayed model differs from the dynamics of the discrete delayed model when some reactant become scarce.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 21:15:01 GMT" } ]
2007-12-05T00:00:00
[ [ "Albornoz", "José M.", "" ], [ "Parravano", "Antonio", "" ] ]
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712.0392
Saeed Akhavan Astaneh
Saeed Akhavan-Astaneh, Saeed Gazor
Collaborative Gain in Resource Sharing Communication Networks
This paper has been withdrawn
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper has been withdrawn
[ { "version": "v1", "created": "Tue, 4 Dec 2007 03:48:46 GMT" }, { "version": "v2", "created": "Thu, 15 Jan 2009 14:59:16 GMT" } ]
2009-01-15T00:00:00
[ [ "Akhavan-Astaneh", "Saeed", "" ], [ "Gazor", "Saeed", "" ] ]
[ 0.0692629889, -0.0172588825, 0.0818304121, -0.0150837507, -0.0034528426, -0.0081958361, -0.0351432934, 0.061244864, -0.0483362414, -0.1040082201, 0.0664196834, -0.0877444968, -0.0198605098, 0.0394935533, 0.0553592145, 0.0575201288, 0.0301390681, -0.0986628011, 0.0486490056, -0.0029996904, -0.0218508244, 0.0318450555, 0.0436732173, 0.0686943308, 0.0080821039, -0.0422231294, 0.0615860596, 0.0283620004, -0.0291154776, -0.0523453057, 0.0308498964, -0.067727603, -0.0698885173, -0.0235994589, -0.1853837073, 0.0775085837, -0.0456635319, 0.1208974719, -0.0564965382, -0.0041938797, -0.0475401171, -0.0959332213, -0.0381287672, 0.0976392105, 0.0498431958, 0.0093615931, 0.0508667864, -0.0727318302, 0.1353414804, -0.0111173354, -0.1082163155, -0.0879150927, -0.0005553337, -0.0426211916, -0.1073633209, -0.0691492632, 0.0805224925, -0.0252201445, -0.1324981749, 0.0152685661, -0.0723906308, -0.0563259386, 0.0200879741, -0.0413985699, 0.0256608576, -0.1103203669, -0.0187089685, 0.0033657663, -0.0342618674, 0.0835364014, -0.0963312909, 0.0585721545, 0.0348873921, 0.0628939793, -0.014870503, -0.028134536, -0.0531698652, -0.0052672289, 0.0258172397, 0.0126527222, 0.009965796, 0.064315632, 0.0248647314, 0.0057150498, -0.054420922, -0.0686943308, -0.2223467231, -0.0965587497, -0.0714807734, 0.0315038562, -0.0127877798, 0.0213390291, -0.0202301387, -0.0213532466, 0.0574916974, -0.0541365929, 0.0109183043, 0.0671020746, -0.0015851444, 0.1112302244, 0.0456635319, -0.1172580346, -0.1114008203, -0.0469998866, 0.039834749, -0.0394366868, -0.0095606241, -0.0395504199, -0.0203580875, -0.0233862121, -0.079498902, -0.1166893765, 0.0098094139, -0.0436163507, -0.0275090095, -0.1477383077, -0.0798969641, -0.1010511816, 0.0918957293, 0.014308949, -0.1087849811, -0.0058785402, 0.1017335728, -0.0024328057, 0.0630645826, 0.0370198749, 0.0611311309, -0.0231871791, -0.0733573586, -0.1086143777, 0.0626096502, -0.0228033327, 0.0380434655, -0.032072518, -0.0238980073, -0.0281487536, -0.0376738347, 0.0132356007, -0.0543924905, -0.0816029534, 0.0397210196, 0.0308214631, -0.0166191384, 0.0608467981, -0.0782478452, 0.0801812932, 0.0149700185, -0.0117855128, -0.0681825355, 0.1042356864, 0.0577760264, -0.0529708341, 0.046658691, 0.0418819338, -0.0434173197, -0.0758026019, -0.0480234772, 0.0063121445, -0.0265707169, -0.0205571204, 0.0414270014, 0.0006410772, -0.0756888688, 0.0525443405, 0.0660216212, 0.0707415119, -0.077849783, -0.0388964601, -0.16195485, 0.0091696698, 0.001086677, -0.0957057625, -0.1396633089, 0.0869483724, -0.1064534634, -0.0610173978, -0.0024505765, -0.1052024066, 0.0663628206, -0.074437812, 0.0147852032, 0.0651117638, 0.0351148583, -0.0429339558, -0.0954782963, -0.0628371164, 0.0346599296, 0.0153965149, 0.0425927602, 0.0313901231, 0.0281487536, 0.038100332, 0.0760869309, -0.0312479585, -0.0155813303, 0.0167044364, -0.0218081754, 0.0893936157, -0.0012048519, -0.1245369092, 0.0256892908, -0.0101435026, 0.0352285914, 0.0154675972, -0.0195193123, -0.1045200154, 0.0107832467, -0.0370198749, -0.0218366086, 0.00534542, 0.1408006251, 0.0809205547, 0.0178559758, -0.0483362414, 0.0227606837, -0.0182824731, -0.0298547372, 0.1150971204, -0.0418819338, 0.0151832672, -0.0419672318, 0.0675570071, 0.000943623, 0.0921800584, 0.0837069973, 0.0360531509, -0.0180692244, -0.0357119516, -0.0062943739, -0.1252193004, 0.0166191384, 0.0224479195, -0.0382709317, -0.0557004102, 0.0363090485, 0.0560984761, -0.0296841394, -0.0461468957, -0.0955351591, -0.0510373861, 0.0017592971, -0.0183962043, -0.0175858624, 0.082910873, -0.0640313029, 0.0202443562, -0.0558710098, -0.0261868704, -0.0701159835, 0.0262721702, 0.0011000049, 0.11549519, 0.0075134425, -0.0038917784, 0.0019441121, 0.0186947528 ]
712.0393
Assani
I.Assani and Z. Buczolich
The $(L^{p},L^{1})$ bilinear Hardy-Littlewood function and Furstenberg averages
This paper has been withdrawn
null
null
null
math.DS math.CA
null
More work needs to be done to move from the tail to the averages themselves. So at this time we prefer to withdraw the paper about the averages. However a previous version of the paper which deals with the tail has been checked and we believe it to be complete and correct.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 14:43:07 GMT" }, { "version": "v2", "created": "Thu, 10 Apr 2008 21:43:56 GMT" }, { "version": "v3", "created": "Mon, 28 Apr 2008 20:09:42 GMT" } ]
2008-04-29T00:00:00
[ [ "Assani", "I.", "" ], [ "Buczolich", "Z.", "" ] ]
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712.0394
Teymour Darkhosh
Teymour Darkhosh
Consistency of the Massive Spin 3/2 Particle Coupled to the Electromagnetic Field in the Context of Supergravity
This paper has been withdrawn
null
null
null
hep-th
null
This paper has been withdrawn by the author because similar published work on the topic was overlooked. See S. Deser and A. Waldron, Nucl. Phys. B 631, 369-387 (2002).
[ { "version": "v1", "created": "Mon, 3 Dec 2007 21:28:16 GMT" }, { "version": "v2", "created": "Sat, 15 Dec 2007 15:34:28 GMT" } ]
2007-12-15T00:00:00
[ [ "Darkhosh", "Teymour", "" ] ]
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712.0395
Erin Chambers
Erin W. Chambers, Vin de Silva, Jeff Erickson, and Robert Ghrist
Rips Complexes of Planar Point Sets
16 pages, 8 figures
null
null
null
math.GT math.AT
null
Fix a finite set of points in Euclidean $n$-space $\euc^n$, thought of as a point-cloud sampling of a certain domain $D\subset\euc^n$. The Rips complex is a combinatorial simplicial complex based on proximity of neighbors that serves as an easily-computed but high-dimensional approximation to the homotopy type of $D$. There is a natural ``shadow'' projection map from the Rips complex to $\euc^n$ that has as its image a more accurate $n$-dimensional approximation to the homotopy type of $D$. We demonstrate that this projection map is 1-connected for the planar case $n=2$. That is, for planar domains, the Rips complex accurately captures connectivity and fundamental group data. This implies that the fundamental group of a Rips complex for a planar point set is a free group. We show that, in contrast, introducing even a small amount of uncertainty in proximity detection leads to `quasi'-Rips complexes with nearly arbitrary fundamental groups. This topological noise can be mitigated by examining a pair of quasi-Rips complexes and using ideas from persistent topology. Finally, we show that the projection map does not preserve higher-order topological data for planar sets, nor does it preserve fundamental group data for point sets in dimension larger than three.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 21:33:20 GMT" } ]
2007-12-05T00:00:00
[ [ "Chambers", "Erin W.", "" ], [ "de Silva", "Vin", "" ], [ "Erickson", "Jeff", "" ], [ "Ghrist", "Robert", "" ] ]
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712.0396
Randall Kelley
Jui-yu Chiu, Frank Golf, Randall Kelley, Aneesh V. Manohar
Electroweak Corrections in High Energy Processes using Effective Field Theory
26 pages
Phys.Rev.D77:053004,2008
10.1103/PhysRevD.77.053004
null
hep-ph
null
Electroweak Sudakov logarithms at high energy, of the form alpha/(sin^2theta_W)^n log^m s/M_{Z,W}^2, are summed using effective theory methods. The corrections are computed to processes involving two external particles in the standard model. The results include non-zero particle masses, such as the t-quark mass, electroweak mixing effects which lead to unequal W and Z masses, and radiative Higgs corrections proportional to the Yukawa couplings. We show that the matching at the scale M_{W,Z} has a term at most linear in log s/mu^2 to all orders. The effective theory formalism is compared with, and extends, previous work based on infrared evolution equations.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 21:34:47 GMT" } ]
2008-11-26T00:00:00
[ [ "Chiu", "Jui-yu", "" ], [ "Golf", "Frank", "" ], [ "Kelley", "Randall", "" ], [ "Manohar", "Aneesh V.", "" ] ]
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712.0397
Cesare Tronci
Darryl D. Holm, Vakhtang Putkaradze, Cesare Tronci
Kinetic models of heterogeneous dissipation
28 pages, 2 figures. Submitted to J. Phys. A
null
10.1088/1751-8113/41/34/344010
null
nlin.AO nlin.PS
null
We suggest kinetic models of dissipation for an ensemble of interacting oriented particles, for example, moving magnetized particles. This is achieved by introducing a double bracket dissipation in kinetic equations using an oriented Poisson bracket, and employing the moment method to derive continuum equations for magnetization and density evolution. We show how our continuum equations generalize the Debye-Hueckel equations for attracting round particles, and Landau-Lifshitz-Gilbert equations for spin waves in magnetized media. We also show formation of singular solutions that are clumps of aligned particles (orientons) starting from random initial conditions. Finally, we extend our theory to the dissipative motion of self-interacting curves.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 21:44:43 GMT" } ]
2008-10-29T00:00:00
[ [ "Holm", "Darryl D.", "" ], [ "Putkaradze", "Vakhtang", "" ], [ "Tronci", "Cesare", "" ] ]
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712.0398
Michele Trenti
M. Trenti (1), M. Stiavelli (1,2) ((1) Stsci, (2) Jhu)
Cosmic Variance and Its Effect on the Luminosity Function Determination in Deep High z Surveys
ApJ, 676, 767; Public cosmic variance calculator relocated at https://www.ph.unimelb.edu.au/~mtrenti/cvc/CosmicVariance.html
null
10.1086/528674
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study cosmic variance in deep high redshift surveys and its influence on the determination of the luminosity function for high redshift galaxies. For several survey geometries relevant for HST and JWST instruments, we characterize the distribution of the galaxy number counts. This is obtained by means of analytic estimates via the two point correlation function in extended Press-Schechter theory as well as by using synthetic catalogs extracted from N-body cosmological simulations of structure formation. We adopt a simple luminosity - dark halo mass relation to investigate the environment effects on the fitting of the luminosity function. We show that in addition to variations of the normalization of the luminosity function, a steepening of its slope is also expected in underdense fields, similarly to what is observed within voids in the local universe. Therefore, to avoid introducing artificial biases, caution must be taken when attempting to correct for field underdensity, such as in the case of HST UDF i-dropout sample, which exhibits a deficit of bright counts with respect to the average counts in GOODS. A public version of the cosmic variance calculator based on the two point correlation function integration is made available on the web.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 21:45:36 GMT" }, { "version": "v2", "created": "Mon, 27 Jul 2020 07:23:38 GMT" } ]
2020-07-28T00:00:00
[ [ "Trenti", "M.", "", "Stsci" ], [ "Stiavelli", "M.", "", "Stsci", "Jhu" ] ]
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712.0399
J. S. Langer
J.S. Langer
Shear-transformation-zone theory of plastic deformation near the glass transition
15 pages, four figures
null
10.1103/PhysRevE.77.021502
null
cond-mat.mtrl-sci cond-mat.stat-mech
null
The shear-transformation-zone (STZ) theory of plastic deformation in glass-forming materials is reformulated in light of recent progress in understanding the roles played the effective disorder temperature and entropy flow in nonequilibrium situations. A distinction between fast and slow internal state variables reduces the theory to just two coupled equations of motion, one describing the plastic response to applied stresses, and the other the dynamics of the effective temperature. The analysis leading to these equations contains, as a byproduct, a fundamental reinterpretation of the dynamic yield stress in amorphous materials. In order to put all these concepts together in a realistic context, the paper concludes with a reexamination of the experimentally observed rheological behavior of a bulk metallic glass. That reexamination serves as a test of the STZ dynamics, confirming that system parameters obtained from steady-state properties such as the viscosity can be used to predict transient behaviors.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 21:48:26 GMT" } ]
2009-11-13T00:00:00
[ [ "Langer", "J. S.", "" ] ]
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712.04
William Gibbs
J. P. Dedonder, W. R. Gibbs and Mutazz Nuseirat
Phase Variation of Hadronic Amplitudes
null
Phys.Rev.C77:044003,2008
10.1103/PhysRevC.77.044003
null
nucl-th
null
The phase variation with angle of hadronic amplitudes is studied with a view to understanding the underlying physical quantities which control it and how well it can be determined in free space. We find that unitarity forces a moderately accurate determination of the phase in standard amplitude analyses but that the nucleon-nucleon analyses done to date do not give the phase variation needed to achieve a good representation of the data in multiple scattering calculations. Models are examined which suggest its behavior near forward angles is related to the radii of the real and absorptive parts of the interaction. The dependence of this phase on model parameters is such that if these radii are modified in the nuclear medium (in combination with the change due to the shift in energy of the effective amplitude in the medium) then the larger magnitudes of the phase needed to fit the data might be attainable, but only for negative values of the phase variation parameter.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 21:58:43 GMT" } ]
2008-11-26T00:00:00
[ [ "Dedonder", "J. P.", "" ], [ "Gibbs", "W. R.", "" ], [ "Nuseirat", "Mutazz", "" ] ]
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712.0401
Pedro Lauridsen Ribeiro
Pedro Lauridsen Ribeiro
Structural and Dynamical Aspects of the AdS/CFT Correspondence: a Rigorous Approach
English translation (with corrections) of the author's Ph.D. thesis (University of S. Paulo, Brazil, September 2007), originally written in Portuguese - see comments in page ii for more details. 201 pages, 7 figures. V3: an incorrect and ultimately irrelevant construction in Subsection 2.3.1 replaced by appropriate amendments, 1 extra reference and erratum
null
null
null
math-ph gr-qc hep-th math.DG math.MP math.OA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We elaborate a detailed study of certain aspects of (a version of) the AdS/CFT correspondence, conjectured by Maldacena and Witten, between quantum field theories in a gravitational background given by an asymptotically anti-de Sitter (AAdS) spacetime, and conformally covariant quantum field theories in the latter's conformal infinity (in the sense of Penrose), aspects such that: (a) are independent from (the pair of) specific models in Quantum Field Theory, and (b) susceptible to a recast in a mathematically rigorous mould. We adopt as a starting point the theorem demonstrated by Rehren in the context of Local Quantum Physics (also known as Algebraic Quantum Field Theory) in anti-de Sitter (AdS) spacetimes, called algebraic holography or Rehren duality. The main body of the present work consists in extending Rehren's result to a reasonably general class of d-dimensional AAdS spacetimes (d>3), scrutinizing how the properties of such an extension are weakened and/or modified as compared to AdS spacetime, and probing how non-trivial gravitational effects manifest themselves in the conformal infinity's quantum theory. The language employed for the quantum theories relevant for our generalization of Rehren duality follows the functorial formulation of Local Quantum Physics due to Brunetti, Fredenhagen and Verch, extended afterwards by Sommer in order to incorporate boundary conditions.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 21:59:05 GMT" }, { "version": "v2", "created": "Tue, 4 Dec 2007 21:36:10 GMT" }, { "version": "v3", "created": "Thu, 26 Jun 2008 10:45:18 GMT" } ]
2008-06-26T00:00:00
[ [ "Ribeiro", "Pedro Lauridsen", "" ] ]
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712.0402
Victor T. Kim
Grigorii B. Pivovarov (Institue for Nuclear Research, Moscow) and Victor T. Kim (St. Petersburg Nuclear Physics Institute, Gatchina)
On Naturalness of Scalar Fields and Standard Model
REVTeX, 3 pages
Phys.Rev.D78:016001,2008
10.1103/PhysRevD.78.016001
CERN-PH-TH/2007-250
hep-ph hep-th
null
We discuss how naturalness predicts the scale of new physics. Two conditions on the scale are considered. The first is the more conservative condition due to Veltman (Acta Phys. Polon. B 12, 437 (1981)). It requires that radiative corrections to the electroweak mass scale would be reasonably small. The second is the condition due to Barbieri and Giudice (Nucl. Phys. B 306, 63 (1988)), which is more popular lately. It requires that physical mass scale would not be oversensitive to the values of the input parameters. We show here that the above two conditions behave differently if higher order corrections are taken into account. Veltman's condition is robust (insensitive to higher order corrections), while Barbieri-Giudice condition changes qualitatively. We conclude that higher order perturbative corrections take care of the fine tuning problem, and, in this respect, scalar field is a natural system. We apply the Barbieri-Giudice condition with higher order corrections taken into account to the Standard Model, and obtain new restrictions on the Higgs boson mass.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 19:08:54 GMT" } ]
2008-11-26T00:00:00
[ [ "Pivovarov", "Grigorii B.", "", "Institue for Nuclear Research, Moscow" ], [ "Kim", "Victor T.", "", "St. Petersburg Nuclear Physics Institute, Gatchina" ] ]
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712.0403
H. Casini
H. Casini
Entropy localization and extensivity in the semiclassical black hole evaporation
27 pages, 5 figures
null
10.1103/PhysRevD.79.024015
null
hep-th gr-qc
null
We aim to quantify the distribution of information in the Hawking radiation and inside the black hole in the semiclassical evaporation process. The structure quantum field theory forces to consider a shared information between two different regions of space-time. Using this tool, we show that the entropy of a thermal gas at the Unruh temperature underestimates the actual amount of (shared) information present in a region of the Rindler space. Then, we analyze the mutual information between the black hole and the late time radiation region. We show that in the semiclassical picture it is not possible to recover the eventual purity of the initial state in the final Hawking radiation through correlations established during the whole evaporation period, no matter the interactions present in the theory. We find extensivity of the entropy as a consequence of a reduction to a two dimensional conformal problem in a simple approximation. However, this seems not to be guaranteed in a full four dimensional calculation. We also find that a large amount of information is contained in a small approximately flat region of space-time near the point where the horizon begins. This gives place to large violations of the entropy bounds. This problem is not eased by backscattering effects and we argue that a breaking of conformal invariance is necessary to delocalize the entropy. Finally, we indicate that the mutual information could lead to a way to understand the Bekenstein-Hawking black hole entropy which does not require a reduction in degrees of freedom in order to regulate the entanglement entropy. On the contrary a large number of field degrees of freedom at high energies giving place to a Hagedorn transition implements a distance cutoff in the mutual information, which may in consequence turn out to be bounded.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 22:13:39 GMT" } ]
2013-05-29T00:00:00
[ [ "Casini", "H.", "" ] ]
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712.0404
Wenyu Chen
W. Chen, G. de Loubens, J-M. L. Beaujour, A. D. Kent and J. Z. Sun
Finite size effects on spin-torque driven ferromagnetic resonance in spin-valves with a Co/Ni synthetic free layer
3 pages, 3 figures
J. Appl. Phys. 103, 07A502 (2008)
10.1063/1.2832671
null
cond-mat.mes-hall cond-mat.mtrl-sci
null
Spin-torque driven ferromagnetic resonance (ST-FMR) is used to study magnetic excitations in Co/Ni synthetic layers confined in nanojunctions. Field swept ST-FMR measurements were conducted with a magnetic field applied perpendicular to the layer surface. The resonance lines were measured under low amplitude excitation in a linear response regime. The resulting resonance fields were compared with those obtained using conventional rf field driven FMR on extended films with the same Co/Ni layer structure. A lower resonance field is found in confined structures. The effect of both dipolar fields acting on the Co/Ni layer emanating from other magnetic layers in the device and finite size effects on the spin wave spectrum are discussed.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 23:06:19 GMT" }, { "version": "v2", "created": "Thu, 14 Feb 2008 03:41:14 GMT" } ]
2008-02-14T00:00:00
[ [ "Chen", "W.", "" ], [ "de Loubens", "G.", "" ], [ "Beaujour", "J-M. L.", "" ], [ "Kent", "A. D.", "" ], [ "Sun", "J. Z.", "" ] ]
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712.0405
Gast\'on Andr\'es Garc\'ia
Gaston Andres Garcia and Cristian Vay
Hopf algebras of dimension 16
23 pages
Algebr. Represent. Theory 13, no. 4 (2010), 383--405
null
null
math.QA math.RA
null
We complete the classification of Hopf algebras of dimension 16 over an algebraically closed field of characteristic zero. We show that a non-semisimple Hopf algebra of dimension 16, has either the Chevalley property or its dual is pointed.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 14:28:04 GMT" } ]
2010-07-02T00:00:00
[ [ "Garcia", "Gaston Andres", "" ], [ "Vay", "Cristian", "" ] ]
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712.0406
Elizabeth Jenkins
Elizabeth Jenkins
Model-Independent Bottom Baryon Mass Predictions in the 1/N Expansion
15 pages
Phys.Rev.D77:034012,2008
10.1103/PhysRevD.77.034012
null
hep-ph
null
Recent discoveries of the Xi_b, Sigma_b and Sigma_b^* baryons at the Tevatron are in good agreement with model-independent mass predictions made a decade ago based on a combined expansion in 1/N_c, 1/m_Q and SU(3) flavor symmetry breaking. Using the new experimental data as input, mass predictions for the undiscovered bottom baryons Xi_b^\prime, Xi_b^*, Omega_b and Omega_b^* and for many unmeasured bottom baryon mass splittings are updated. The observed ground state charm baryons exhibit the mass hierarchy previously predicted by the 1/N_c, 1/m_Q and SU(3) flavor breaking expansion.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 22:34:52 GMT" } ]
2008-11-26T00:00:00
[ [ "Jenkins", "Elizabeth", "" ] ]
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712.0407
Stanislav Kupin
A. Borichev, L. Golinskii, S. Kupin
A Blaschke-type condition and its application to complex Jacobi matrices
a detailed preliminary version; a shorter version is available upon request
null
10.1112/blms/bdn109
null
math-ph math.MP
null
We obtain a Blaschke-type necessary conditions on zeros of analytic functions on the unit disk with different types of exponential growth at the boundary. These conditions are used to prove Lieb-Thirring-type inequalities for the eigenvalues of complex Jacobi matrices.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 23:15:02 GMT" }, { "version": "v2", "created": "Thu, 3 Jan 2008 23:23:53 GMT" } ]
2014-02-26T00:00:00
[ [ "Borichev", "A.", "" ], [ "Golinskii", "L.", "" ], [ "Kupin", "S.", "" ] ]
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712.0408
Melvyn B. Nathanson
Melvyn B. Nathanson
Inverse Problems for Representation Functions in Additive Number Theory
23 pages
Surveys in Number Theory, Springer, New York, 2008, pp. 89--117
null
null
math.NT math.CO
null
For every positive integer h, the representation function of order h associated to a subset A of the integers or, more generally, of any group or semigroup X, counts the number of ways an element of X can be written as the sum (or product, if X is nonabelian) of h not necessarily distinct elements of X. The direct problem for representation functions in additive number theory begins with a subset A of X and seeks to understand its representation functions. The inverse problem for representation functions starts with a function f:X ->N_0 U {\infty} and asks if there is a set A whose representation function is f, and, if the answer is yes, to classify all such sets. This paper is a survey of recent progress on the inverse representation problem.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 22:55:53 GMT" } ]
2020-04-22T00:00:00
[ [ "Nathanson", "Melvyn B.", "" ] ]
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712.0409
Giuseppe Tinaglia
Giuseppe Tinaglia
Structure theorems for embedded disks with mean curvature bounded in L^P
null
null
null
null
math.DG
null
After appropriate normalizations an embedded disk whose second fundamental form has large norm contains a multi-valued graph, provided the L^P norm of the mean curvature is sufficiently small. This generalizes to non-minimal surfaces a well known result of Colding and Minicozzi.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 23:13:53 GMT" } ]
2007-12-05T00:00:00
[ [ "Tinaglia", "Giuseppe", "" ] ]
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712.041
Bourgeois Gerald
Bourgeois Gerald
About the logarithm function over the matrices
Minor corrections and a new result
null
null
null
math.RA
null
We prove the following results: let x,y be (n,n) complex matrices such that x,y,xy have no eigenvalue in ]-infinity,0] and log(xy)=log(x)+log(y). If n=2, or if n>2 and x,y are simultaneously triangularizable, then x,y commute. In both cases we reduce the problem to a result in complex analysis.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 18:09:08 GMT" }, { "version": "v2", "created": "Thu, 20 Dec 2007 09:16:10 GMT" } ]
2007-12-20T00:00:00
[ [ "Gerald", "Bourgeois", "" ] ]
[ 0.071632266, -0.028861085, -0.0942480043, -0.0110831298, 0.092118904, 0.0443798341, 0.0660966188, -0.0260459464, -0.0137090152, 0.0511929393, -0.0315579399, -0.0540790483, -0.0477863848, 0.024744831, -0.0444744602, 0.0813787952, 0.0075523783, 0.0293105617, 0.081331484, 0.0186295938, 0.1041837856, -0.0100185815, 0.0629266277, 0.0573436655, 0.0713010728, -0.0451131873, -0.0194457471, -0.0243899822, 0.0625008121, -0.038607616, -0.0040689399, -0.0021660598, 0.0360763557, -0.0366204605, -0.0969921723, 0.0441196077, 0.0311321206, 0.0224974528, 0.0840756521, 0.1375869364, -0.0548360609, 0.0760797113, -0.1570800096, 0.0029570784, 0.0234792028, 0.0064700874, -0.0543629304, 0.0049057929, -0.0120826224, 0.0907941312, -0.01577897, -0.0383473933, -0.0452787839, 0.0283169821, -0.0577221699, -0.0016677922, -0.0341365114, 0.0881445929, 0.0007440749, -0.0293815304, 0.0084217591, -0.067657955, 0.0931597948, 0.0330246501, -0.0208533164, -0.0159445666, -0.0813787952, 0.0235620011, 0.0713010728, -0.0026480637, -0.0790131316, -0.0122896181, 0.0254545305, 0.0730989799, -0.0674213842, -0.0129520036, -0.0227576755, 0.1355051547, 0.0268029589, -0.0492057838, 0.0043942183, 0.000222705, -0.0047963811, 0.1406149864, 0.0060620108, -0.0386785865, -0.0419668555, -0.0045598149, -0.1092936173, 0.0013033323, 0.05076712, 0.0438120738, 0.0718688294, 0.0501047373, 0.0999255925, -0.0666643754, 0.1103345081, 0.0765055344, 0.00634589, -0.0070082759, -0.0964244083, -0.0052458569, 0.0678472072, 0.0894693658, 0.11534971, 0.0144187137, -0.0496316031, -0.0454680361, -0.0015864725, -0.0908414498, -0.0370226204, 0.0654815435, 0.004950149, 0.0036076356, 0.0270631816, -0.0713010728, -0.1248123646, -0.0854950473, -0.0612233505, -0.068888098, -0.0044297036, -0.0439066999, -0.0465798974, 7.104e-7, 0.042179767, -0.0923081562, 0.0170682557, -0.0168316904, 0.0039831847, -0.0461067669, 0.0883338451, -0.0125853252, -0.0554038212, -0.0152112115, -0.1183777601, -0.0366914272, 0.0730989799, 0.0172811653, 0.100871861, 0.0807637274, -0.0153413229, -0.0260932595, 0.0082679912, -0.0528962165, -0.1112807766, 0.1230144575, 0.0579114221, 0.0835078955, 0.0574856028, 0.0073098978, 0.0060501825, 0.0471003428, 0.0371409059, 0.0290503372, 0.0349171832, -0.0763635933, 0.0357215069, -0.0324332342, 0.1034267768, -0.0082620773, 0.059330821, 0.0987900719, -0.0388205238, 0.0201909319, 0.0170209426, 0.0847853497, -0.1062655672, -0.0532274097, -0.0389151499, -0.1086312309, 0.0571544096, -0.0290739946, -0.0324805491, -0.0130466297, -0.0106987096, 0.0179553796, -0.0912672654, -0.2496247292, -0.0657181069, 0.0469110906, -0.04537341, 0.0011702637, 0.0309901815, -0.054930687, -0.0104503147, 0.038323734, -0.0616964847, -0.0390570909, 0.071632266, 0.0026155359, -0.0246028919, 0.0694085434, 0.0183930267, 0.0930178538, 0.0613179766, -0.1851840764, 0.0166187808, -0.0366914272, -0.0528489053, -0.0208178312, -0.0191736966, -0.0264007952, 0.0405001454, -0.0377559774, -0.0377323218, 0.0012271876, 0.0612706654, 0.0339709148, -0.0572017245, -0.044687368, 0.0006006566, -0.0788238794, 0.0763635933, 0.0341365114, -0.0260696039, 0.06075022, -0.1649340093, -0.0043232488, 0.0683676526, 0.0583845563, -0.080243282, 0.0190790705, 0.0765055344, -0.0374484397, -0.0100777233, 0.0251943078, 0.0763635933, -0.0700709298, 0.06075022, 0.0428421497, 0.0792497024, 0.0008656847, -0.0250050556, -0.061838422, 0.0783507451, -0.0682730228, -0.0691246614, -0.0680364594, -0.0688407868, 0.0721527115, -0.0526596531, 0.0936802402, 0.0909360722, -0.1006826013, 0.0299729463, 0.0112250699, 0.0048643937, 0.0434808806, -0.0267793015, -0.0284825787, -0.2006081939, 0.0112960394, 0.0410915613, -0.0634943843, -0.0590942539, -0.0310138389 ]
712.0411
Suresh Thippireddy
Suresh Thippireddy and Sandeep Chalasani
Period of the d-Sequence Based Random Number Generator
8 pages, 4 figures
null
null
null
cs.CR
null
This paper presents an expression to compute the exact period of a recursive random number generator based on d-sequences. Using the multi-recursive version of this generator we can produce large number of pseudorandom sequences.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 23:29:42 GMT" } ]
2007-12-05T00:00:00
[ [ "Thippireddy", "Suresh", "" ], [ "Chalasani", "Sandeep", "" ] ]
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712.0412
Duncan K. Galloway
Duncan Galloway (1), Feryal Ozel (2) and Dimitrios Psaltis (2) ((1) Monash University, Melbourne, Australia, (2) University of Arizona, Tucson, AZ)
Biases for neutron-star mass, radius and distance measurements from Eddington-limited X-ray bursts
6 pages, 4 figures, accepted by the Monthly Notices of the Royal Astronomical Society; minor changes in response to the referee's report, added an assessment on the orbital phase dependence of the f-ratio for two systems, and a discussion of other systematic effects on the neutron-star mass and radii
null
10.1111/j.1365-2966.2008.13219.x
null
astro-ph
null
Eddington-limited X-ray bursts from neutron stars can be used in conjunction with other spectroscopic observations to measure neutron star masses, radii, and distances. In order to quantify some of the uncertainties in the determination of the Eddington limit, we analysed a large sample of photospheric radius-expansion thermonuclear bursts observed with the Rossi X-ray Timing Explorer. We identified the instant at which the expanded photosphere "touches down" back onto the surface of the neutron star and compared the corresponding touchdown flux to the peak flux of each burst. We found that for the majority of sources, the ratio of these fluxes is smaller than 1.6, which is the maximum value expected from the changing gravitational redshift during the radius expansion episodes (for a 2M_sun neutron star). The only sources for which this ratio is larger than 1.6 are high inclination sources that include dippers and Cyg X-2. We discuss two possible geometric interpretations of this effect and show that the inferred masses and radii of neutron stars are not affected by this bias. On the other hand, systematic uncertainties as large as ~50% may be introduced to the distance determination.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 00:04:02 GMT" }, { "version": "v2", "created": "Tue, 18 Mar 2008 03:36:35 GMT" } ]
2009-11-13T00:00:00
[ [ "Galloway", "Duncan", "" ], [ "Ozel", "Feryal", "" ], [ "Psaltis", "Dimitrios", "" ] ]
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712.0413
Erhan Bayraktar
Erhan Bayraktar, Mike Ludkovski
Sequential Tracking of a Hidden Markov Chain Using Point Process Observations
Key words and phrases. Markov Modulated Poisson processes, optimal switching
null
null
null
math.OC math.PR
null
We study finite horizon optimal switching problems for hidden Markov chain models under partially observable Poisson processes. The controller possesses a finite range of strategies and attempts to track the state of the unobserved state variable using Bayesian updates over the discrete observations. Such a model has applications in economic policy making, staffing under variable demand levels and generalized Poisson disorder problems. We show regularity of the value function and explicitly characterize an optimal strategy. We also provide an efficient numerical scheme and illustrate our results with several computational examples.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 00:04:16 GMT" }, { "version": "v2", "created": "Thu, 22 May 2008 03:04:41 GMT" } ]
2008-05-22T00:00:00
[ [ "Bayraktar", "Erhan", "" ], [ "Ludkovski", "Mike", "" ] ]
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712.0414
Sanefumi Moriyama
Hiroaki Kanno, Sanefumi Moriyama
Instanton Calculus and Loop Operator in Supersymmetric Gauge Theory
19 pages, 2 figures, v2: references added
Phys.Rev.D77:126001,2008
10.1103/PhysRevD.77.126001
null
hep-th
null
We compute one-point function of the glueball loop operator in the maximally confining phase of supersymmetric gauge theory using instanton calculus. In the maximally confining phase the residual symmetry is the diagonal U(1) subgroup and the localization formula implies that the chiral correlation functions are the sum of the contributions from each fixed point labeled by the Young diagram. The summation can be performed exactly by operator formalism of free fermions, which also featured in the equivariant Gromov-Witten theory of P^1. By taking the Laplace transformation of the glueball loop operator, we find an exact agreement with the previous results for the generating function (resolvent) of the glueball one-point functions.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 04:17:04 GMT" }, { "version": "v2", "created": "Wed, 9 Apr 2008 04:59:37 GMT" } ]
2008-11-26T00:00:00
[ [ "Kanno", "Hiroaki", "" ], [ "Moriyama", "Sanefumi", "" ] ]
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712.0415
Luciano da Fontoura Costa
Luciano da Fontoura Costa
Random and Longest Paths: Unnoticed Motifs of Complex Networks
13 pages, 8 figures. A working manuscript: comments welcomed
null
null
null
physics.soc-ph cond-mat.dis-nn physics.comp-ph
null
Paths are important structural elements in complex networks because they are finite (unlike walks), related to effective node coverage (minimum spanning trees), and can be understood as being dual to star connectivity. This article introduces the concept of random path applies it for the investigation of structural properties of complex networks and as the means to estimate the longest path. Random paths are obtained by selecting one of the network nodes at random and performing a random self-avoiding walk (here called path-walk) until its termination. It is shown that the distribution of random paths are markedly different for diverse complex network models (i.e. Erdos-Renyi, Barabasi-Albert, Watts-Strogatz, a geographical model, as well as two recently introduced path-based network types), with the BA structures yielding the shortest random walks, while the longest paths are produced by WS networks. Random paths are also explored as the means to estimate the longest paths (i.e. several random paths are obtained and the longest taken). The convergence to the longest path and its properties ire characterized with respect to several networks models. Several results are reported and discussed, including the markedly distinct lengths of the longest paths obtained for the different network models.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 00:19:34 GMT" } ]
2007-12-05T00:00:00
[ [ "Costa", "Luciano da Fontoura", "" ] ]
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712.0416
Russell Ryan Jr.
R. E. Ryan, S. H. Cohen, R. A. Windhorst, J. Silk
Galaxy Mergers at z>1 in the HUDF: Evidence for a Peak in the Major Merger Rate of Massive Galaxies
Accepted to ApJ. 7 pages, 6 figures, 1 table. Uses and includes emulateapj.cls. In the initial submission, Figures 1 and 2 where switched
null
10.1086/527463
null
astro-ph
null
We present a measurement of the galaxy merger fraction and number density from observations in the Hubble Ultra Deep Field for 0.5<z<2.5. We fit the combination of broadband data and slitless spectroscopy of 1308 galaxies with stellar population synthesis models to select merging systems based on a stellar mass of >10^10 M_sol. When correcting for mass incompleteness, the major merger fraction is not simply proportional to (1+z)^m, but appears to peak at z_frac~=1.3+-0.4. From this merger fraction, we infer that ~42% of massive galaxies have undergone a major merger since z~1. We show that the major merger number density peaks at z_dens~1.2, which marks the epoch where major merging of massive galaxies is most prevalent. This critical redshift is comparable to the peak of the cosmic star formation rate density, and occurs roughly 2.6 Gyr earlier in cosmic time than the peak in the number density of X-ray selected active galactic nuclei. These observations support an indirect evolutionary link between merging, starburst, and active galaxies.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 00:46:48 GMT" }, { "version": "v2", "created": "Wed, 5 Dec 2007 20:17:31 GMT" } ]
2009-11-13T00:00:00
[ [ "Ryan", "R. E.", "" ], [ "Cohen", "S. H.", "" ], [ "Windhorst", "R. A.", "" ], [ "Silk", "J.", "" ] ]
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712.0417
Sergei Kopeikin
Sergei Kopeikin (University of Missouri-Columbia) and Valeri Makarov (Michelson Science Center, Caltech)
Gravitational bending of light by planetary multipoles
4 pages, contributed talk submitted to the proceedings of the IAU 248 Symp. "A Giant Step: from Milli- to Micro-arcsecond Astrometry" (Shanghai, October 2007)
null
null
null
gr-qc
null
General relativistic deflection of light by mass, dipole, and quadrupole moments of gravitational field of a moving massive planet in the Solar system is derived in the approximation of the linearized Einstein equations. All terms of order 1 microarcsecond are taken into account, parametrized, and classified in accordance with their physical origin. We discuss the observational capabilities of the near-future optical and radio interferometers for detecting the Doppler modulation of the radial deflection, and the dipolar and quadrupolar light-ray bendings by Jupiter and the Saturn.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 00:49:15 GMT" } ]
2007-12-05T00:00:00
[ [ "Kopeikin", "Sergei", "", "University of Missouri-Columbia" ], [ "Makarov", "Valeri", "", "Michelson Science Center, Caltech" ] ]
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712.0418
Craig Antonio Pastro
Craig Pastro and Ross Street
Closed categories, star-autonomy, and monoidal comonads
25 pages
Journal of Algebra 321 no. 11 (2009) 3494-3520
null
null
math.CT
null
This paper determines what structure is needed for internal homs in a monoidal category C to be liftable to the category C^G of Eilenberg-Moore coalgebras for a monoidal comonad G on C. We apply this to lift star-autonomy with the view to recasting the definition of quantum groupoid.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 01:04:11 GMT" } ]
2010-03-03T00:00:00
[ [ "Pastro", "Craig", "" ], [ "Street", "Ross", "" ] ]
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712.0419
Guo-Qing Zheng
E. Kusano, S. Kawasaki, K. Matano, G. -q. Zheng, R.L. Meng, J. Cmaidalka, C.W. Chu
Pressure dependence of the superconducting transition and electron correlations in Na_xCoO_2 \cdot 1.3H_2O
published on 19, Sept. 2007 on Phys. Rev. B
Phys. Rev. B76, 100506(R) (2007)
10.1103/PhysRevB.76.100506
null
cond-mat.supr-con cond-mat.str-el
null
We report T_c and ^{59}Co nuclear quadrupole resonance (NQR) measurements on the cobalt oxide superconductor Na_{x}CoO_{2}\cdot 1.3H_{2}O (T_c=4.8 K) under hydrostatic pressure (P) up to 2.36 GPa. T_c decreases with increasing pressure at an average rate of -0.49\pm0.09 K/GPa. At low pressures P\leq0.49 GPa, the decrease of T_c is accompanied by a weakening of the spin correlations at a finite wave vector and a reduction of the density of states (DOS) at the Fermi level. At high pressures above 1.93 GPa, however, the decrease of T_c is mainly due to a reduction of the DOS. These results indicate that the electronic/magnetic state of Co is primarily responsible for the superconductivity. The spin-lattice relaxation rate 1/T_1 at P=0.49 GPa shows a T^3 variation below T_c down to T\sim 0.12T_c, which provides compelling evidence for the presence of line nodes in the superconducting gap function.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 01:21:07 GMT" } ]
2007-12-05T00:00:00
[ [ "Kusano", "E.", "" ], [ "Kawasaki", "S.", "" ], [ "Matano", "K.", "" ], [ "Zheng", "G. -q.", "" ], [ "Meng", "R. L.", "" ], [ "Cmaidalka", "J.", "" ], [ "Chu", "C. W.", "" ] ]
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712.042
Yang Jiao
Y. Jiao, F. H. Stillinger, S. Torquato
Dense Packings of Superdisks and the Role of Symmetry
15 pages, 8 figures
null
10.1103/PhysRevLett.100.245504
null
cond-mat.soft
null
We construct the densest known two-dimensional packings of superdisks in the plane whose shapes are defined by |x^(2p) + y^(2p)| <= 1, which contains both convex-shaped particles (p > 0.5, with the circular-disk case p = 1) and concave-shaped particles (0 < p < 0.5). The packings of the convex cases with p 1 generated by a recently developed event-driven molecular dynamics (MD) simulation algorithm [Donev, Torquato and Stillinger, J. Comput. Phys. 202 (2005) 737] suggest exact constructions of the densest known packings. We find that the packing density (covering fraction of the particles) increases dramatically as the particle shape moves away from the "circular-disk" point (p = 1). In particular, we find that the maximal packing densities of superdisks for certain p 6 = 1 are achieved by one of the two families of Bravais lattice packings, which provides additional numerical evidence for Minkowski's conjecture concerning the critical determinant of the region occupied by a superdisk. Moreover, our analysis on the generated packings reveals that the broken rotational symmetry of superdisks influences the packing characteristics in a non-trivial way. We also propose an analytical method to construct dense packings of concave superdisks based on our observations of the structural properties of packings of convex superdisks.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 01:26:19 GMT" } ]
2009-11-13T00:00:00
[ [ "Jiao", "Y.", "" ], [ "Stillinger", "F. H.", "" ], [ "Torquato", "S.", "" ] ]
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712.0421
Yayu Wang
Yayu Wang, R. Yamachika, A. Wachowiak, M. Grobis, K. H. Khoo, D. H. Lee, Steven G. Louie, and M. F. Crommie
Novel Orientational Ordering and Reentrant Metallicity in KxC60 Monolayers for 3 <= x <= 5
16 pages, 4 figures
Phys. Rev. Lett. 99, 086402 (2007)
10.1103/PhysRevLett.99.086402
null
cond-mat.mtrl-sci cond-mat.str-el
null
We have performed local STM studies on potassium-doped C60 (KxC60) monolayers over a wide regime of the phase diagram. As K content increases from x = 3 to 5, KxC60 monolayers undergo metal-insulator-metal reentrant phase transitions and exhibit a variety of novel orientational orderings. The most striking new structure has a pinwheel-like 7-molecule unit cell in insulating K4+dC60. We propose that the driving mechanism for the orientational ordering in KxC60 is the lowering of electron kinetic energy through maximization of the overlap of neighboring molecular orbitals over the entire doping range x = 3 to 5. In the insulating and metallic phases this gives rise to orbital versions of the superexchange and double-exchange interactions respectively.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 01:42:56 GMT" } ]
2009-11-13T00:00:00
[ [ "Wang", "Yayu", "" ], [ "Yamachika", "R.", "" ], [ "Wachowiak", "A.", "" ], [ "Grobis", "M.", "" ], [ "Khoo", "K. H.", "" ], [ "Lee", "D. H.", "" ], [ "Louie", "Steven G.", "" ], [ "Crommie", "M. F.", "" ] ]
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712.0422
Yayu Wang
Yayu Wang, Ryan Yamachika, Andre Wachowiak, Michael Grobis, and Michael F. Crommie
Tuning fulleride electronic structure and molecular ordering via variable layer index
16 pages, 4 figures, to appear in Nature Materials
null
10.1038/nmat2100
null
cond-mat.mtrl-sci cond-mat.str-el
null
C60 fullerides are uniquely flexible molecular materials that exhibit a rich variety of behavior, including superconductivity and magnetism in bulk compounds, novel electronic and orientational phases in thin films, and quantum transport in a single-C60 transistor. The complexity of fulleride properties stems from the existence of many competing interactions, such as electron-electron correlations, electron-vibration coupling, and intermolecular hopping. The exact role of each interaction is controversial due to the difficulty of experimentally isolating the effects of a single interaction in the intricate fulleride materials. Here we report a unique level of control of the material properties of KxC60 ultra-thin films through well-controlled atomic layer indexing and accurate doping concentrations. Using STM techniques, we observe a series of electronic and structural phase transitions as the fullerides evolve from two-dimensional monolayers to quasi-threedimensional multilayers in the early stages of layer-by-layer growth. These results demonstrate the systematic evolution of fulleride electronic structure and molecular ordering with variable KxC60 film layer index, and shed new light on creating novel molecular structures and devices.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 01:48:24 GMT" } ]
2009-11-13T00:00:00
[ [ "Wang", "Yayu", "" ], [ "Yamachika", "Ryan", "" ], [ "Wachowiak", "Andre", "" ], [ "Grobis", "Michael", "" ], [ "Crommie", "Michael F.", "" ] ]
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712.0423
Zigao Dai
Dong Zhang, Z. G. Dai (NJU)
Hyperaccretion Disks around Neutron Stars
44 pages, 10 figures, improved version following the referees' comments, main conclusions unchanged, accepted for publication in ApJ
null
10.1086/589820
null
astro-ph
null
(Abridged) We here study the structure of a hyperaccretion disk around a neutron star. We consider a steady-state hyperaccretion disk around a neutron star, and as a reasonable approximation, divide the disk into two regions, which are called inner and outer disks. The outer disk is similar to that of a black hole and the inner disk has a self-similar structure. In order to study physical properties of the entire disk clearly, we first adopt a simple model, in which some microphysical processes in the disk are simplified, following Popham et al. and Narayan et al. Based on these simplifications, we analytically and numerically investigate the size of the inner disk, the efficiency of neutrino cooling, and the radial distributions of the disk density, temperature and pressure. We see that, compared with the black-hole disk, the neutron star disk can cool more efficiently and produce a much higher neutrino luminosity. Finally, we consider an elaborate model with more physical considerations about the thermodynamics and microphysics in the neutron star disk (as recently developed in studying the neutrino-cooled disk of a black hole), and compare this elaborate model with our simple model. We find that most of the results from these two models are basically consistent with each other.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 02:11:09 GMT" }, { "version": "v2", "created": "Sun, 4 May 2008 03:15:18 GMT" } ]
2009-11-13T00:00:00
[ [ "Zhang", "Dong", "", "NJU" ], [ "Dai", "Z. G.", "", "NJU" ] ]
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712.0424
Al\'an Aspuru-Guzik
Michele Ceotto, Sule Atahan, Sangwoo Shim, Gianfranco Tantardini, Al\'an Aspuru-Guzik
First-Principles Semiclassical Initial Value Representation Molecular Dynamics
5 pages, 2 figures, made stylistic and clarity changes
Phys. Chem. Chem. Phys., 2009, 11, 3861 - 3867
10.1039/b820785b
null
cond-mat.mtrl-sci cond-mat.other
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A method for carrying out semiclassical initial value representation calculations using first-principles molecular dynamics (FP-SC-IVR) is presented. This method can extract the full vibrational power spectrum of carbon dioxide from a single trajectory providing numerical results that agree with experiment even for Fermi resonant states. The computational demands of the method are comparable to those of classical single-trajectory calculations, while describing uniquely quantum features such as the zero-point energy and Fermi resonances. By propagating the nuclear degrees of freedom using first-principles Born-Oppenheimer molecular dynamics, the stability of the method presented is improved considerably when compared to dynamics carried out using fitted potential energy surfaces and numerical derivatives.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 02:28:18 GMT" }, { "version": "v2", "created": "Mon, 17 Dec 2007 16:26:37 GMT" }, { "version": "v3", "created": "Sun, 14 Jun 2009 16:06:35 GMT" } ]
2009-06-14T00:00:00
[ [ "Ceotto", "Michele", "" ], [ "Atahan", "Sule", "" ], [ "Shim", "Sangwoo", "" ], [ "Tantardini", "Gianfranco", "" ], [ "Aspuru-Guzik", "Alán", "" ] ]
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712.0425
Yoshiyasu Ishigami
Yoshiyasu Ishigami
The number of hypergraphs and colored Hypergraphs with hereditary properties
9 pages
null
null
null
math.CO
null
As an application of Szemeredi's regularity lemma, Erdos-Frankl-Rodl (1986) showed that the number of graphs on vertex set {1,2,...n} with a monotone class P is $2^{(1+o(1))ex(n,P)n^2/2}$ where $ex(n,P)$ is the maximum number of edges of an n-vertex graph which has no subgraph in P. Kohayakawa et al. (2003) extended it from monotone to hereditary and from graphs to 3-uniform hypergraphs. We extend it to general hypergraphs. This may be a simple example illustrating how to apply a recent hypergraph regularity lemma by the author.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 03:01:04 GMT" } ]
2007-12-05T00:00:00
[ [ "Ishigami", "Yoshiyasu", "" ] ]
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712.0426
Nikos Kalogeropoulos
Nikos Kalogeropoulos
Rate of parity violation from measure concentration
10 pages, no figures
Int.J.Mod.Phys.A23:509-517,2008
10.1142/S0217751X08039372
null
hep-th cond-mat.stat-mech math-ph math.MP
null
We present a geometric argument determining the kinematic (phase-space) factor contributing to the relative rate at which degrees of freedom of one chirality come to dominate over degrees of freedom of opposite chirality, in models with parity violation. We rely on the measure concentration of a subset of a Euclidean cube which is controlled by an isoperimetric inequality. We provide an interpretation of this result in terms of ideas of Statistical Mechanics.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 03:12:56 GMT" } ]
2008-11-26T00:00:00
[ [ "Kalogeropoulos", "Nikos", "" ] ]
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712.0427
Matt Visser
Matt Visser (Victoria University of Wellington) and Silke Weinfurtner (Victoria University of Wellington)
Analogue spacetimes: Toy models for "quantum gravity''
24 pages; Based on a talk at the conference: From Quantum to Emergent Gravity: Theory and Phenomenology, June 11-15 2007, Trieste, Italy
PoSQG-Ph:042,2007
null
null
gr-qc
null
Why are "analogue spacetimes'' interesting? For the purposes of this workshop the answer is simple: Analogue spacetimes provide one with physically well-defined and physically well-understood concrete models of many of the phenomena that seem to be part of the yet incomplete theory of "quantum gravity'', or more accessibly, "quantum gravity phenomenology''. Indeed "analogue spacetimes'' provide one with concrete models of "emergence'' (whereby the effective low-energy theory can be radically different from the high-energy microphysics). They also provide many concrete and controlled models of "Lorentz symmetry breaking'', and extensions of the usual notions of pseudo-Riemannian geometry such as "rainbow spacetimes'', and pseudo-Finsler geometries, and more. I will provide an overview of the key items of "unusual physics'' that arise in analogue spacetimes, and argue that they provide us with hints of what we should be looking for in any putative theory of "quantum gravity''. For example: The dispersion relations that naturally arise in the known emergent/analogue spacetimes typically violate analogue Lorentz invariance at high energy, but do not do so in completely arbitrary manner. This suggests that a search for arbitrary violations of Lorentz invariance is possibly overkill: There are a number of natural and physically well-motivated restrictions one can put on emergent/ analogue dispersion relations, considerably reducing the plausible parameter space.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 03:35:09 GMT" } ]
2009-04-14T00:00:00
[ [ "Visser", "Matt", "", "Victoria University of Wellington" ], [ "Weinfurtner", "Silke", "", "Victoria University of Wellington" ] ]
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712.0428
Ippei Danshita
Ippei Danshita, Carlos A. R. Sa de Melo, Charles W. Clark
Experimentally accessible reentrant phase transitions in double-well optical lattices
4 pages, 5 figures
Phys. Rev. A 77, 063609 (2008)
null
null
cond-mat.other
null
We study the quantum phases of bosons confined in a combined potential of a one-dimensional double-well optical lattice and a parabolic trap. We apply the time-evolving block decimation method to the corresponding two-legged Bose-Hubbard model. In the absence of a parabolic trap, the system of bosons in the double-well optical lattice exhibits a reentrant quantum phase transition between Mott insulator and superfluid phases at unit filling as the tilt of the double-wells is increased. We show that the reentrant phase transition occurs also in the presence of a parabolic trap and suggest that it can be detected in experiments by measuring the matter-wave interference pattern.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 03:55:29 GMT" } ]
2008-06-21T00:00:00
[ [ "Danshita", "Ippei", "" ], [ "de Melo", "Carlos A. R. Sa", "" ], [ "Clark", "Charles W.", "" ] ]
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712.0429
Zuo-Hong Li
Zuo-Hong Li, Wei Liu, Hai-Yan Liu
Systematic Study on QCD Interactions of Heavy Mesons with $\rho$ Meson
16 pages, 1 eps figure, version to appear in PLB
Phys.Lett.B659:598-606,2008
10.1016/j.physletb.2007.11.074
null
hep-ph
null
The strong interactions of the negative-parity heavy mesons with $\rho$ meson may be described consistently in the context of an effective lagrangian, which is invariant under isospin SU(2) transformation. Four coupling constants $g_{HH\rho}$, $f_{H^*H\rho}$, $g_{H^*H^*\rho}$ and $f_{H^*H^*\rho}$ enter the effective lagrangian, where $H$ $(H^*)$ denotes a pseudoscalar bottom or charm meson (the corresponding vector meson). Using QCD light cone sum rule (LCSR) method and, as inputs, the hadronic parameters updated recently, we give an estimate of $g_{H^*H^*\rho}$ and $f_{H^*H^*\rho}$, about which little was known before, and present an improved result for $g_{HH\rho}$ and $f_{H^*H\rho}$. Also, we examine the heavy quark asymptotic behavior of these nonperturbative quantities and assess the two low energy parameters $\beta$ and $\lambda$ of the corresponding effective chiral lagrangian.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 03:51:25 GMT" } ]
2008-11-26T00:00:00
[ [ "Li", "Zuo-Hong", "" ], [ "Liu", "Wei", "" ], [ "Liu", "Hai-Yan", "" ] ]
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712.043
Patrick Kelly
P. L. Kelly (1 and 2), R. P. Kirshner (2), M. Pahre (2) ((1) Stanford University, (2) CfA)
Long Gamma-Ray Bursts and Type Ic Core Collapse Supernovae Have Similar Locations in Hosts
Accepted by the Astrophysical Journal, 12 pages, 3 tables, 4 figures, SN sample size increases from 263 to 504 in v2, varying host magnitude and distance shown not to introduce systematic error in measurements
Astrophysical Journal, November 10, 2008, Vol. 687, 1201
10.1086/591925
SLAC-PUB-13030
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
When the afterglow fades at the site of a long-duration gamma-ray burst (LGRB), Type Ic supernovae (SN Ic) are the only type of core collapse supernova observed. Recent work found that a sample of LGRB in high-redshift galaxies had different environments from a collection of core-collapse environments, which were identified from their colors and light curves. LGRB were in the brightest regions of their hosts, but the core-collapse sample followed the overall distribution of the galaxy light. Here we examine 504 supernovae with types assigned based on their spectra that are located in nearby (z < 0.06) galaxies for which we have constructed surface photometry from the Sloan Digital Sky Survey (SDSS). The distributions of the thermonuclear supernovae (SN Ia) and some varieties of core-collapse supernovae (SN II and SN Ib) follow the galaxy light, but the SN Ic (like LGRB) are much more likely to erupt in the brightest regions of their hosts. The high-redshift hosts of LGRB are overwhelmingly irregulars, without bulges, while many low redshift SN Ic hosts are spirals with small bulges. When we remove the bulge light from our low-redshift sample, the SN Ic and LGRB distributions agree extremely well. If both LGRB and SN Ic stem from very massive stars, then it seems plausible that the conditions necessary for forming SN Ic are also required for LGRB. Additional factors, including metallicity, may determine whether the stellar evolution of a massive star leads to a LGRB with an underlying broad-lined SN Ic, or simply a SN Ic without a gamma-ray burst.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 05:12:23 GMT" }, { "version": "v2", "created": "Mon, 10 Nov 2008 09:12:40 GMT" } ]
2009-11-13T00:00:00
[ [ "Kelly", "P. L.", "", "1 and 2" ], [ "Kirshner", "R. P.", "" ], [ "Pahre", "M.", "" ] ]
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712.0431
Akiyuki Tokuno
Akiyuki Tokuno, Masahiro Sato
Spontaneous rotation in one-dimensional systems of cold atoms
6 pages, 3 figures, final version
Phys. Rev. A 78, 013623 (2008)
10.1103/PhysRevA.78.013623
null
cond-mat.other cond-mat.str-el
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We theoretically study harmonically trapped one-dimensional Bose gases (e.g., Li, Na, K, Rb, etc.) with multibands occupied, focusing on effects of higher-energy bands. Combining the Ginzburg-Landau theory with the bosonization techniques, we predict that the repulsive interaction between higher-band bosons and the quantum fluctuation can induce the ground state with a finite angular momentum around the trapped axis. In this state, the Z_2 reflection symmetry (clockwise or anticlockwise rotations) is spontaneously broken.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 04:08:02 GMT" }, { "version": "v2", "created": "Tue, 22 Jul 2008 16:14:05 GMT" } ]
2008-07-22T00:00:00
[ [ "Tokuno", "Akiyuki", "" ], [ "Sato", "Masahiro", "" ] ]
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712.0432
Jun Ohkubo
Jun Ohkubo
The stochastic pump current and the non-adiabatic geometrical phase
11 pages
J. Stat. Mech. P02011 (2008)
10.1088/1742-5468/2008/02/P02011
null
physics.bio-ph cond-mat.stat-mech
null
We calculate a pump current in a classical two-state stochastic chemical kinetics by means of the non-adiabatic geometrical phase interpretation. The two-state system is attached to two particle reservoirs, and under a periodic perturbation of the kinetic rates, it gives rise to a pump current between the two-state system and the absorbing states. In order to calculate the pump current, the Floquet theory for the non-adiabatic geometrical phase is extended from a Hermitian case to a non-Hermitian case. The dependence of the pump current on the frequency of the perturbative kinetic rates is explicitly derived, and a stochastic resonance-like behavior is obtained.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 04:20:55 GMT" }, { "version": "v2", "created": "Fri, 29 Feb 2008 13:45:54 GMT" } ]
2009-11-13T00:00:00
[ [ "Ohkubo", "Jun", "" ] ]
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712.0433
Igor I Klebanov
I.Klebanov, N.Ginchitskii, P.Gritsay
State equation for the three-dimentional system of "collapsing" hard spheres
6 pages
null
null
null
cond-mat.stat-mech cond-mat.other
null
By Wertheim method the exact solution of the Percus-Yevick integral equation for a system of particles with the "repulsive step potential",interacting ("collapsing" hard spheres) is obtained. On the basis of this solution the state equation for the "repulsive step potential" is built and determined, that the Percus-Yevick equation does not show the Van der Waalse loop for "collapsing" hard spheres.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 04:50:17 GMT" } ]
2007-12-05T00:00:00
[ [ "Klebanov", "I.", "" ], [ "Ginchitskii", "N.", "" ], [ "Gritsay", "P.", "" ] ]
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712.0434
Sourendu Gupta
Sourendu Gupta
The phase diagram of QCD at small chemical potentials
14 pages
null
null
TIFR/TH/07/34
hep-ph
null
We investigate the phase diagram of QCD at small chemical potentials, ie, when chiral and flavour symmetry breaking involves the pairing of a quark and an antiquark. The phase diagram of two-flavour QCD at small chemical potentials involves chiral symmetry restoration and charged pion condensation. We extend previous studies of the topology of the phase diagram, in sections with high degree of symmetry, to the physical case of fully broken flavour symmetry, using generic thermodynamic arguments. We argue that the extension is unique and present the result. In three flavour QCD the phase diagram for chiral symmetry restoration is less well constrained. However, we argue that present lattice data allows just two different phase diagrams, which we discuss.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 05:15:26 GMT" } ]
2007-12-05T00:00:00
[ [ "Gupta", "Sourendu", "" ] ]
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712.0435
Philipp Kronberg
P. P. Kronberg, M. L. Bernet, F. Miniati, S. J. Lilly, M. B. Short, D. M. Higdon
A Global Probe of Cosmic Magnetic Fields to High Redshifts
10 pages, 8 figures Astrophysical Jounrnal in press, March 2008
Astrophys.J.676:7079,2008
10.1086/527281
null
astro-ph
null
Faraday rotation (RM) probes of magnetic fields in the universe are sensitive to cosmological and evolutionary effects as $z$ increases beyond $\sim $1 because of the scalings of electron density and magnetic fields, and the growth in the number of expected intersections with galaxy-scale intervenors, $d$N/$dz$. In this new global analysis of an unprecedented large sample of RM's of high latitude quasars extending out to $z\sim $3.7 we find that the distribution of RM broadens with redshift in the 20 $-$ 80 rad m$^{-2}$ range range, despite the (1 +$z$)$^{-2}$ wavelength dilution expected in the observed Faraday rotation. Our results indicate that the Universe becomes increasingly ``Faraday-opaque'' to sources beyond $z \sim$ 2, that is, as $z$ increases progressively fewer sources are found with a ``small'' RM in the observer's frame. This is in contrast to sources at $z \la$1. They suggest that the environments of galaxies were significantly magnetized at high redshifts, with magnetic field strengths that were at least as strong within a few Gyr of the Big Bang as at the current epoch. We separately investigate a simple unevolving toy model in which the RM is produced by MgII absorber systems, and find that it can approximately reproduce the observed trend with redshift. An additional possibility is that the intrinsic RM associated with the radio sources was much higher in the past, and we show that this is not a trivial consequence of the higher radio luminosities of the high redshift sources.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 05:18:06 GMT" } ]
2009-11-13T00:00:00
[ [ "Kronberg", "P. P.", "" ], [ "Bernet", "M. L.", "" ], [ "Miniati", "F.", "" ], [ "Lilly", "S. J.", "" ], [ "Short", "M. B.", "" ], [ "Higdon", "D. M.", "" ] ]
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712.0436
Pavel Abumov Mr.
P. Abumov and D. W. L. Sprung
Resonant carrier dynamics in strongly biassed superlattices
18 pages, 10 figures, submitted to Phys. Rev. B. submitted to Journal of Physics
null
null
null
cond-mat.mtrl-sci cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study coherent electron dynamics in a biassed undriven ideal semiconductor superlattice coupled to the continuum, near energy level anticrossings. In particular, we examine the dependence of wavepacket dynamical characteristics on electric field detuning, and investigate mixed regimes involving a superposition of energy level anticrossings showing both Rabi oscillations and resonant tunnelling. In earlier work [Phys. Rev. B 75 165421 (2007)], Rabi and Zener resonances were shown to have a common origin, and a criteria for the occurrence of either was proposed. The present results allow a better understanding of the nature of an interminiband resonance, which can be useful in the areas of microwave radiation generation and matter manipulation on the particle level, as well as demonstrate an alternative approach to examining electron level structure of a finite superlattice.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 05:57:44 GMT" }, { "version": "v2", "created": "Sat, 19 Jan 2008 21:32:16 GMT" }, { "version": "v3", "created": "Fri, 30 Oct 2009 05:55:11 GMT" } ]
2009-10-30T00:00:00
[ [ "Abumov", "P.", "" ], [ "Sprung", "D. W. L.", "" ] ]
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712.0437
Jinwu Ye
Jinwu Ye
Quantum phases and transitions of excitons, metastable excitonic supersolid and its internal photon detection in electron-hole bilayer systems
9+ pages, 4 figures, REVTEX4
Journal of Low Temperature Physics: Volume 158, Issue 5 (2010), 882.
null
null
cond-mat.str-el
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We construct a quantum Ginsburg-Landau theory to study the quantum phases and transitions in electron hole bilayer system. We propose that in the dilute limit as distance is increased, there is a first order transition from the excitonic superfluid (ESF) to the excitonic supersolid (ESS) driven by the collapsing of a roton minimum, then a 2nd order transition from the ESS to excitonic normal solid. We show the latter transition is in the same universality class of superfluid to Mott transition in a rigid lattice. We then study novel elementary low energy excitations inside the ESS. We find that there are two "supersolidon" longitudinal modes (one upper branch and one lower branch) inside the ESS, while the transverse mode in the ESS stays the same as that inside a ENS. We also work out various experimental signatures of these novel elementary excitations by evaluating the Debye-Waller factor, density-density correlation, specific heat and vortex -vertex interactions. For the meta-stable supersolid generated by photon pumping, we show that the angle resolved spectrum is dominated by the macroscopic super-radiance from its superfluid component, even it is just a very small percentage of the the whole system. This fact can be used to detect the metastable ESS state generated by photon pumping by a power spectrum experiment easily and without any ambiguity.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 06:18:18 GMT" }, { "version": "v2", "created": "Mon, 17 Dec 2007 06:09:14 GMT" }, { "version": "v3", "created": "Fri, 22 Feb 2008 20:28:50 GMT" }, { "version": "v4", "created": "Thu, 11 Sep 2008 12:49:14 GMT" } ]
2010-01-31T00:00:00
[ [ "Ye", "Jinwu", "" ] ]
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712.0438
Jin Hong Kim
Jin Hong Kim
Solvable automorphism groups of a compact Kaehler manifold
14 pages; Theorem 1.4 added
null
null
null
math.AG math.SG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let X be a compact Kaehler manifold of complex dimension n. Let G be a connected solvable subgroup of the automorphism group Aut(X), and let N(G) be the normal subgroup of G of elements of null entropy. One of the goals of this paper is to show that G/N(G) is a free abelian group of rank r(G) less than or equal to n-1 and that the rank estimate is optimal. This gives an alternative proof of the conjecture of Tits type. In addition, we show some non-obvious implications on the structure of solvable automorphism groups of compact Kaehler manifolds. Furthermore, we also show that if the rank r(G) of the quotient group G/N(G) is equal to n-1 and the identity component Aut_0(X) of Aut(X) is trivial, then N(G) is a finite set. The main strategy of this paper is to combine the method of Dinh and Sibony and the theorem of Birkhoff-Perron-Frobenius (or Lie-Kolchin type), and one argument of D.-Q. Zhang originated from the paper of Dinh and Sibony plays an important role.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 06:21:36 GMT" }, { "version": "v2", "created": "Sun, 2 Mar 2008 10:40:03 GMT" }, { "version": "v3", "created": "Tue, 11 Mar 2008 08:50:43 GMT" }, { "version": "v4", "created": "Wed, 12 Mar 2008 12:28:13 GMT" }, { "version": "v5", "created": "Thu, 20 Mar 2008 11:08:12 GMT" }, { "version": "v6", "created": "Fri, 21 Mar 2008 09:19:18 GMT" }, { "version": "v7", "created": "Thu, 29 May 2008 08:08:15 GMT" }, { "version": "v8", "created": "Wed, 21 Apr 2010 12:32:31 GMT" }, { "version": "v9", "created": "Sun, 20 Jun 2010 11:47:57 GMT" } ]
2010-06-22T00:00:00
[ [ "Kim", "Jin Hong", "" ] ]
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712.0439
Doron Cohen
Alexander Stotland, Rangga Budoyo, Tal Peer, Tsampikos Kottos, Doron Cohen
The mesoscopic conductance of disordered rings, its random matrix theory, and the generalized variable range hopping picture
11 pages, 3 figures, improved version to be published as JPA/FTC
J. Phys. A 41, 262001 (FTC) (2008)
10.1088/1751-8113/41/26/262001
null
cond-mat.mes-hall quant-ph
null
The calculation of the conductance of disordered rings requires a theory that goes beyond the Kubo-Drude formulation. Assuming "mesoscopic" circumstances the analysis of the electro-driven transitions show similarities with a percolation problem in energy space. We argue that the texture and the sparsity of the perturbation matrix dictate the value of the conductance, and study its dependence on the disorder strength, ranging from the ballistic to the Anderson localization regime. An improved sparse random matrix model is introduced to captures the essential ingredients of the problem, and leads to a generalized variable range hopping picture.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 06:28:56 GMT" }, { "version": "v2", "created": "Wed, 19 Mar 2008 06:47:43 GMT" }, { "version": "v3", "created": "Wed, 14 May 2008 11:40:05 GMT" } ]
2008-06-05T00:00:00
[ [ "Stotland", "Alexander", "" ], [ "Budoyo", "Rangga", "" ], [ "Peer", "Tal", "" ], [ "Kottos", "Tsampikos", "" ], [ "Cohen", "Doron", "" ] ]
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712.044
G. S. Asanov
G. S. Asanov
Finsleroid-regular space: curvature tensor, continuation of gravitational Schwarzschild metric
null
null
null
null
math-ph math.MP
null
The method of simple straightforward calculation of the curvature tensor of the Finsleroid--regular space is indicated. The Schwarzschild metric which underlines the gravitational field produced by static spherical-symmetric body is shown to be uniquely extended to the Finslerian domain upon a consistent treatment of the pseudo-Finsleroid axis vector field $b_i$ to be the field of the time variable. Keywords: Finsler metrics, gravitational equations, curvature tensors.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 06:52:23 GMT" } ]
2007-12-05T00:00:00
[ [ "Asanov", "G. S.", "" ] ]
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712.0441
Mariluz Mart\'in Manj\'on
M.L. Mart\'in Manj\'on, M. Moll\'a, A.I. D\'iaz, R. Terlevich
Chemical and Spectrophotometric Evolutionary Models for Emission Line Star-forming Galaxies
2 pages, 4 figures, proceedings to Formation and Evolution of Galaxy Disks conference, Rome 2007
null
null
null
astro-ph
null
We present a self-consistent model under a star-bursting scenario for H{\sc ii} galaxies, combining different codes of chemical evolution, evolutionary population synthesis and photoionization. The results obtained reproduce simultaneoulsy the observed abundances, diagnostic diagrams and equivalent width-colour relations for local H{\sc ii} galaxies.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 07:13:50 GMT" } ]
2007-12-05T00:00:00
[ [ "Manjón", "M. L. Martín", "" ], [ "Mollá", "M.", "" ], [ "Díaz", "A. I.", "" ], [ "Terlevich", "R.", "" ] ]
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712.0442
Anatolii Mal'shukov
A.G. Mal'shukov and C.S.Chu
Spin orientation and spin-Hall effect induced by tunneling electrons
5 pages
null
10.1103/PhysRevB.76.245326
null
cond-mat.mes-hall
null
It is shown that a flux of unpolarized electrons across a symmetric double barrier quantum well induces a spin polarization inside the well. Besides, the transmitted current acquires a spin polarized component and the spin-Hall current flows in the planar direction. These phenomena are due to a combined effect of Dresselhaus interaction and the spin-orbit interaction induced by gradients of heterostructure material parameters. In contrast to previous studies of the spin filtering effect, we predict that it can be observed in case of an isotropic distribution of incident electrons.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 07:34:12 GMT" } ]
2009-11-13T00:00:00
[ [ "Mal'shukov", "A. G.", "" ], [ "Chu", "C. S.", "" ] ]
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712.0443
Asle Sudbo
Jacob Linder, Takehito Yokoyama, Yukio Tanaka, Yasuhiro Asano, and Asle Sudb\o
Quantum transport in a normal metal/odd-frequency superconductor junction
7 pages, 3 figures. Accepted for publication in Physical Review B
Phys. Rev. B 77, 174505 (2008)
10.1103/PhysRevB.77.174505
null
cond-mat.supr-con
null
Recent experimental results indicate the possible realization of a bulk odd-frequency superconducting state in the compounds CeCu$_2$Si$_2$, and CeRhIn$_5$. Motivated by this, we present a study of the quantum transport properties of a normal metal/odd-frequency superconductor junctions in a search for probes to unveil the odd-frequency symmetry. From the Eliashberg equations, we perform a quasiclassical approximation to account for the transport formalism of an odd-frequency superconductor with the Keldysh formalism. Specifically, we consider the tunneling charge conductance and tunneling thermal conductance. We find qualitatively distinct behaviour in the odd-frequency case as compared to the conventional even-frequency case, in both the electrical and thermal current. This serves as a useful tool to identify the possible existence of a bulk odd-frequency superconducting state.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 08:07:09 GMT" }, { "version": "v2", "created": "Tue, 8 Apr 2008 16:44:46 GMT" } ]
2008-05-07T00:00:00
[ [ "Linder", "Jacob", "" ], [ "Yokoyama", "Takehito", "" ], [ "Tanaka", "Yukio", "" ], [ "Asano", "Yasuhiro", "" ], [ "Sudbø", "Asle", "" ] ]
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712.0444
Shoetsu Ogata
Shoetsu Ogata
Projective normality of nonsingular toric varieties of dimension three
36pages, 17figures
Tohoku Math. J. 64 (2012), 125--140
null
null
math.AG math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that if an ample line bundle L on a nonsingular toric 3-fold satisfies h^0(L+2K)=0, then L is normally generated. As an application, we show that the anti-canonical divisor on a nonsingular toric Fano 4-fold is normally generated.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 09:18:30 GMT" }, { "version": "v2", "created": "Tue, 19 May 2009 01:57:59 GMT" }, { "version": "v3", "created": "Thu, 25 Feb 2010 07:13:30 GMT" } ]
2013-10-25T00:00:00
[ [ "Ogata", "Shoetsu", "" ] ]
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712.0445
F. Saueressig
Pedro F. Machado and Frank Saueressig
On the renormalization group flow of f(R)-gravity
55 pages, 7 figures, typos corrected, references added, version to appear in Phys. Rev. D
Phys.Rev.D77:124045,2008
10.1103/PhysRevD.77.124045
null
hep-th
null
We use the functional renormalization group equation for quantum gravity to construct a non-perturbative flow equation for modified gravity theories of the form $S = \int d^dx \sqrt{g} f(R)$. Based on this equation we show that certain gravitational interactions monomials can be consistently decoupled from the renormalization group (RG) flow and reproduce recent results on the asymptotic safety conjecture. The non-perturbative RG flow of non-local extensions of the Einstein-Hilbert truncation including $\int d^dx \sqrt{g} \ln(R)$ and $\int d^dx \sqrt{g} R^{-n}$ interactions is investigated in detail. The inclusion of such interactions resolves the infrared singularities plaguing the RG trajectories with positive cosmological constant in previous truncations. In particular, in some $R^{-n}$-truncations all physical trajectories emanate from a Non-Gaussian (UV) fixed point and are well-defined on all RG scales. The RG flow of the $\ln(R)$-truncation contains an infrared attractor which drives a positive cosmological constant to zero dynamically.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 09:04:08 GMT" }, { "version": "v2", "created": "Tue, 29 Apr 2008 16:56:35 GMT" } ]
2008-11-26T00:00:00
[ [ "Machado", "Pedro F.", "" ], [ "Saueressig", "Frank", "" ] ]
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712.0446
Re'em Sari
Peter Goldreich and Re'em Sari
Tidal Evolution of Rubble Piles
14 pages including 2 figures
Astrophys.J.691:54-60,2009
10.1088/0004-637X/691/1/54
null
astro-ph
null
Many small bodies in the solar system are believed to be rubble piles, a collection of smaller elements separated by voids. We propose a model for the structure of a self-gravitating rubble pile. Static friction prevents its elements from sliding relative to each other. Stresses are concentrated around points of contact between individual elements. The effective dimensionless rigidity, $\tilde\mu_{rubble}$, is related to that of a monolithic body of similar composition and size, $\tilde\mu$ by $\tilde \mu_{rubble} \sim \tilde \mu^{1/2} \epsilon_Y^{-1/2}$, where $\epsilon_Y \sim 10^{-2}$ is the yield strain. This represents a reduction in effective rigidity below the maximum radius, $R_{max}\sim [\mu\epsilon_Y/(G\rho^2)]^{1/2}\sim 10^3\km$, at which a rubble pile can exist. Densities derived for binary near-Earth asteroids imply that they are rubble piles. As a consequence, their tidal evolution proceeds $10^3$ to $10^4$ times faster than it would if they were monoliths. This accounts for both the sizes of their semimajor axes and their small orbital eccentricities. We show that our model for the rigidity of rubble piles is compatible with laboratory experiment in sand.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 08:31:59 GMT" } ]
2009-02-12T00:00:00
[ [ "Goldreich", "Peter", "" ], [ "Sari", "Re'em", "" ] ]
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712.0447
Pieter C. van der Kruit
P.C. van der Kruit
The stars and gas in outer parts of galaxy disks: Extended or truncated -- flat or warped?
Invited Review at the Vatican Symposium: Formation and Evolution of Galaxy Disks, October 2007, proceeding editors Jose G. Funes, SJ and Enrico M. Corsini
null
null
null
astro-ph
null
I review observations of truncations of stellar disks and models for their origin, compare observations of truncations in moderately inclined galaxies to those in edge-on systems and discuss the relation between truncations and HI-warps and their systematics and origin. Truncations are a common feature in edge-on stellar disks, but the relation of truncations in face-on to those in edge-on galaxies needs further clarification. The origin of truncations is most likely related to a maximum in the specific angular momentum in the material that formed the stellar disks, but this model does probably require some redistribution of angular momentum. HI-warps start just beyond the truncation radius and disks and warps appear distinct components. This suggests that inner disks form initially and settle as rigid, very flat structures, while HI-warps result from later infall of gas with a different orientation of the angular momentum.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 08:35:31 GMT" } ]
2007-12-05T00:00:00
[ [ "van der Kruit", "P. C.", "" ] ]
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712.0448
Rafael Porto
Rafael A. Porto and A. Zee
The Private Higgs
8 pages, no figures. Version published in Phys. Lett. B
Phys.Lett.B666:491-495,2008
10.1016/j.physletb.2008.08.001
null
hep-ph astro-ph hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce Higgs democracy in the Yukawa sector by constructing a model with a private Higgs and a dark scalar for each fermion thus addressing the large hierarchy among fermion masses. The model has interesting implications for the LHC, while the Standard Model phenomenology is recovered at low energies. We discuss some phenomenological implications such as FCNC, new Higgses at the TeV scale and dark matter candidates.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 17:53:40 GMT" }, { "version": "v2", "created": "Mon, 28 Apr 2008 19:48:44 GMT" }, { "version": "v3", "created": "Thu, 18 Sep 2008 16:48:48 GMT" } ]
2008-11-26T00:00:00
[ [ "Porto", "Rafael A.", "" ], [ "Zee", "A.", "" ] ]
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712.0449
Igor Travenec
Igor Travenec
Metal - Insulator Transition in 3D Quantum Percolation
11 pages, 9 figures
null
10.1142/S0217979208049388
null
cond-mat.str-el cond-mat.mes-hall
null
We present the metal - insulator transition study of a quantum site percolation model on simple cubic lattice. Transfer matrix method is used to calculate transport properties - Landauer conductance - for the binary distribution of energies. We calculate the mobility edge in disorder (ratio of insulating sites) - energy plane in detail and we find the extremal critical disorder somewhat closer to the classical percolation threshold, than formerly reported. We calculate the critical exponent $\nu$ along the mobility edge and find it constant and equal to the one of 3D Anderson model, confirming common universality class. Possible exception is the center of the conduction band, where either the single parameter scaling is not valid anymore, or finite size effects are immense. One of the reasons for such statement is the difference between results from arithmetic and geometric averaging of conductance at special energies. Only the geometric mean yields zero critical disorder in band center, which was theoretically predicted.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 08:40:27 GMT" } ]
2009-11-13T00:00:00
[ [ "Travenec", "Igor", "" ] ]
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712.045
Dara Faroughy
Dara Faroughy
Several Action and Action Deformation Proposals in f(R) Variable G Modified Gravities and a Brief Expose on Variable G Ontology
59 pages
null
null
null
gr-qc
null
This note includes five sections. In section 2 a number of aesthetically motivated f(R) Lagrangians is proposed and frivolously explored in the metric formalism with variable Newton constant G(x). In section 3 the idea of deforming the terms in a given f(R) gravity-matter action S, and prior to extremizing it, is promoted with the aim of reducing S via an algebraic mixing between few selected gravity and matter terms without invoking new fields. The result of this is a number of constraint equations among the fields and often eccentric looking field equations derived from the reduced action. Section 4 has a similar upshot as section 3 but the difference is the action term mixing is carried out only after extremizing S and prior to any integration by part. Section 5 pertains to G(x) ontology where various personal views on G(x) gravity are expressed in the context of the Standard Model fermions (SMF). The prospect of mitigating gravity field effects for the SMF is investigated at the end via the variable speed of light (VSL) and new global Lorentz transformations fusing two upper speeds: the light speed c and a proper maximal speed given in the text assigned to all point mass mo and involving the Planck mass. The new LT in combination with VSL also houses a family of special noninertial frames in linear motions. The (spin sensitive) spacetime and momentum dependent VSL is modeled via the Hamiltonian formalism with the aim of canceling the effect of Newtonian gravity felt by a SMF test particle. I also model variable G for yielding finite gravity at all distances, including zero. Excising gravity from the SMF rank (via VSL plus G(x), or by gauging to zero the SMF gravitational masses) has epic brunt on quantum gravity, local SUSY, superstring models, leptoquarks (if any) and cosmology.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 08:41:42 GMT" } ]
2007-12-05T00:00:00
[ [ "Faroughy", "Dara", "" ] ]
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712.0451
Alejandro Chinea Manrique De Lara
Alejandro Chinea Manrique De Lara
A Reactive Tabu Search Algorithm for Stimuli Generation in Psycholinguistics
Artificial Intelligence in Science and Technology AISAT 2004 Conference. 8 pages, 5 figures, 3 tables
Artificial Intelligence in Science and Technology AISAT 2004 Conference
null
null
cs.AI cs.CC cs.DM cs.LG
null
The generation of meaningless "words" matching certain statistical and/or linguistic criteria is frequently needed for experimental purposes in Psycholinguistics. Such stimuli receive the name of pseudowords or nonwords in the Cognitive Neuroscience literatue. The process for building nonwords sometimes has to be based on linguistic units such as syllables or morphemes, resulting in a numerical explosion of combinations when the size of the nonwords is increased. In this paper, a reactive tabu search scheme is proposed to generate nonwords of variables size. The approach builds pseudowords by using a modified Metaheuristic algorithm based on a local search procedure enhanced by a feedback-based scheme. Experimental results show that the new algorithm is a practical and effective tool for nonword generation.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 08:52:46 GMT" } ]
2007-12-05T00:00:00
[ [ "De Lara", "Alejandro Chinea Manrique", "" ] ]
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712.0452
Pascal Baseilhac
Pascal Baseilhac (LMPT)
New results in the XXZ open spin chain
null
Recent Advances in Quantum Integrable Systems, Annecy : France (2007)
null
null
hep-th math-ph math.MP math.QA
null
In this review, I describe a recent approach based on the representation theory of the $q-$Onsager algebra which is used to derive exact results for the XXZ open spin chain. The complete spectrum and eigenstates are obtained as rational functions of a single variable which discrete values correspond to the roots of a certain characteristic polynomial. Comments and open problems are also presented.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 08:54:41 GMT" } ]
2007-12-05T00:00:00
[ [ "Baseilhac", "Pascal", "", "LMPT" ] ]
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712.0453
Mustafa Sabri Kilic
Mustafa Sabri Kilic, Martin Z. Bazant
Induced-charge electrophoresis near an insulating wall
null
null
null
null
cond-mat.mtrl-sci
null
Induced-charge electrophoresis (ICEP) has mostly been analyzed for asymmetric particles in an infinite fluid, but channel walls in real systems further break symmetry and lead to dielectrophoresis (DEP) in local field gradients. Zhao and Bau (Langmuir, \textbf{23}, 2007, pp 4053) recently predicted that a metal (ideally polarizable) cylinder is repelled from an insulating wall in a DC field. We revisit this problem with an AC field and show that attraction to the wall sets in at high frequency and leads to an equilibrium distance, where DEP balances ICEP, although, in three dimensions, a metal sphere is repelled from the wall at all frequencies. This conclusion, however, does not apply to asymmetric particles. Consistent with the recent experiments of Gangwal et al. (arXiv:0708.2417), we show that a metal/insulator Janus particle is always attracted to the wall in an AC field. The Janus particle tends to move toward its insulating end, perpendicular to the field, but ICEP torque rotates this end toward the wall. Under some conditions, the theory predicts steady translation along the wall with an equilibrium tilt angle, as seen in experiments, although more detailed modeling of the contact region of overlapping double layers is required.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 18:08:10 GMT" } ]
2007-12-05T00:00:00
[ [ "Kilic", "Mustafa Sabri", "" ], [ "Bazant", "Martin Z.", "" ] ]
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712.0454
Dorian Kcira
Dorian Kcira
Results from the Commissioning Run of the CMS Silicon Strip Tracker
Proceedings of the 10th ICATPP Conference on Astroparticle, Particle, Space Physics, Detectors and Medical Physics Applications. 6 pages, 5 figures
null
10.1142/9789812819093_0162
CP3-07-32
physics.ins-det
null
Results of the CMS Silicon Strip Tracker performance are presented as obtained in the setups where the tracker is being commissioned.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 08:56:49 GMT" } ]
2017-08-23T00:00:00
[ [ "Kcira", "Dorian", "" ] ]
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712.0455
Jerome Rodriguez
J. Rodriguez, S. E. Shaw, D. C. Hannikainen, T. Belloni, S. Corbel, M. Cadolle Bel, J. Chenevez, L. Prat, P. Kretschmar, H. J. Lehto, I. F. Mirabel, A. Paizis, G. Pooley, M. Tagger, P. Varniere, C. Cabanac, and O. Vilhu
Two Years of INTEGRAL monitoring of GRS 1915+105 Part 2: X-Ray Spectro-Temporal Analysis
13 pages, 8 figures (3 color), accepted for publication in ApJ, scheduled for the March 20, 2008, vol676 issue. Paper 1 is the next astro-ph number
null
10.1086/527372
null
astro-ph
null
(abridged) This is the second paper presenting the results of two years of monitoring of GRS 1915+105 with \integral and \rxte and the Ryle Telescope. We present the X-ray spectral and temporal analysis of four observations which showed strong radio to X-ray correlations. During one observation GRS 1915+105 was in a steady state, while during the three others it showed cycles of X-ray dips and spikes (followed by radio flares). We present the time-resolved spectroscopy of these cyclesand show that in all cases the hard X-ray component (the Comptonized emission from a coronal medium) is suppressed in coincidence with a soft X-ray spike that ends the cycle. We interpret these results as evidence that the soft X-ray spike is the trigger of the ejection, and that the ejected medium is the coronal material. In the steady state observation, the X-ray spectrum is indicative of the hard-intermediate state, with the presence of a relatively strong emission at 15 GHz. The X-ray spectra are the sum of a Comptonized component and an extra power law extending to energies >200 keV without any evidence for a cut-off. We observe a possible correlation of the radio flux with that of the power law component, which may indicate that we see direct emission from the jet at hard X-ray energies. We study the energy dependence of a ~4 Hz QPO during the hard-intermediate state observation. The QPO-``spectrum'' is well modeled by a power law with a cut-off at an energy about 11 keV that clearly differs from the relative contribution of the Comptonized component to the overall flux. This may rule out models of global oscillations of the Compton corona.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 09:22:53 GMT" } ]
2009-11-13T00:00:00
[ [ "Rodriguez", "J.", "" ], [ "Shaw", "S. E.", "" ], [ "Hannikainen", "D. C.", "" ], [ "Belloni", "T.", "" ], [ "Corbel", "S.", "" ], [ "Bel", "M. Cadolle", "" ], [ "Chenevez", "J.", "" ], [ "Prat", "L.", "" ], [ "Kretschmar", "P.", "" ], [ "Lehto", "H. J.", "" ], [ "Mirabel", "I. F.", "" ], [ "Paizis", "A.", "" ], [ "Pooley", "G.", "" ], [ "Tagger", "M.", "" ], [ "Varniere", "P.", "" ], [ "Cabanac", "C.", "" ], [ "Vilhu", "O.", "" ] ]
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712.0456
Jerome Rodriguez
J. Rodriguez, D.C. Hannikainen, S.E. Shaw, G. Pooley, S. Corbel, M. Tagger, I.F. Mirabel, T. Belloni, C. Cabanac, M. Cadolle Bel, J. Chenevez, P. Kretschmar, H.J. Lehto, A. Paizis, P. Varniere, O. Vilhu
Two years of INTEGRAL monitoring of GRS 1915+105 Part 1: multiwavelength coverage with INTEGRAL, RXTE, and the Ryle radio Telescope
17 pages, 14 figures. Accepted for publication in ApJ, scheduled for the March 20, 2008, vol676 issue. Table 3 has been degraded
null
10.1086/527369
null
astro-ph
null
(Abridged) We report the results of monitoring observations of the Galactic microquasar GRS 1915+105 performed simultaneously with INTEGRAL and RXTE Ryle . We present the results of the whole \integral campaign, report the sources that are detected and their fluxes and identify the classes of variability in which GRS 1915+105 is found. The accretion ejection connections are studied in a model independent manner through the source light curves, hardness ratio, and color color diagrams. During a period of steady ``hard'' X-ray state (the so-called class chi) we observe a steady radio flux. We then turn to 3 particular observations during which we observe several types of soft X-ray dips and spikes cycles, followed by radio flares. During these observations GRS 1915+105 is in the so-called nu, lambda, and beta classes of variability. The observation of ejections during class lambda are the first ever reported. We generalize the fact that a (non-major) discrete ejection always occurs, in GRS 1915+105, as a response to an X-ray sequence composed of a spectrally hard X-ray dip terminated by an X-ray spike marking the disappearance of the hard X-ray emission above 18 keV. We also identify the trigger of the ejection as this X-ray spike. A possible correlation between the amplitude of the radio flare and the duration of the X-ray dip is found in our data. In this case the X-ray dips prior to ejections could be seen as the time during which the source accumulates energy and material that is ejected later.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 09:48:51 GMT" } ]
2009-11-13T00:00:00
[ [ "Rodriguez", "J.", "" ], [ "Hannikainen", "D. C.", "" ], [ "Shaw", "S. E.", "" ], [ "Pooley", "G.", "" ], [ "Corbel", "S.", "" ], [ "Tagger", "M.", "" ], [ "Mirabel", "I. F.", "" ], [ "Belloni", "T.", "" ], [ "Cabanac", "C.", "" ], [ "Bel", "M. Cadolle", "" ], [ "Chenevez", "J.", "" ], [ "Kretschmar", "P.", "" ], [ "Lehto", "H. J.", "" ], [ "Paizis", "A.", "" ], [ "Varniere", "P.", "" ], [ "Vilhu", "O.", "" ] ]
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712.0457
William O'Mullane
William O'Mullane, Uwe Lammers, John Hoar, Jose Hernandez
Gaia Science Operations Centre
2 pages no figures
IAU Symposium on Astrometry Shanghai 2007
10.1017/S1743921308019327
null
astro-ph
null
Brief outline of Science Operations Centre activities for Gaia.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 09:09:08 GMT" } ]
2009-11-13T00:00:00
[ [ "O'Mullane", "William", "" ], [ "Lammers", "Uwe", "" ], [ "Hoar", "John", "" ], [ "Hernandez", "Jose", "" ] ]
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712.0458
Wen-Yu Wen
Wen-Yu Wen
Inflation in a refined racetrack
10 pages, 6 figures
Modern Phys. Lett. A 23 (2008) 1589 - 1597
10.1142/S0217732308027989
null
hep-th astro-ph hep-ph
null
In this note, we refine the racetrack inflation model constructed in arXiv:hep-th/0406230 by including the open string modulus. This modulus encodes the embedding of our braneworld inside some Calabi-Yau throat. We argue that in generic this open string modulus dynamically runs with the inflaton field thanks to its nonlinear coupling. A full analysis becomes difficult because the scalar potential changes progressively during the inflation epoch. Nevertheless, by explicit construction we are still able to build a realistic model through appropriate choices of the initial conditions.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 09:13:36 GMT" } ]
2008-08-08T00:00:00
[ [ "Wen", "Wen-Yu", "" ] ]
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712.0459
Jens Svensson
Boualem Djehiche, Jens Svensson
Large Deviations for Heavy-Tailed Factor Models
16 pages
null
null
null
math.PR
null
We study large deviation probabilities for a sum of dependent random variables from a heavy-tailed factor model, assuming that the components are regularly varying. We identify conditions where both the factor and the idiosyncratic terms contribute to the behaviour of the tail-probability of the sum. A simple conditional Monte Carlo algorithm is also provided together with a comparison between the simulations and the large deviation approximation. We also study large deviation probabilities for stochastic processes with factor structure. The processes involved are assumed to be Levy processes with regularly varying jump measures. Based on the results of the first part of the paper, we show that large deviations on a finite time interval are due to one large jump that can come from either the factor or the idiosyncratic part of the process.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 09:24:15 GMT" } ]
2007-12-05T00:00:00
[ [ "Djehiche", "Boualem", "" ], [ "Svensson", "Jens", "" ] ]
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712.046
Vladimir Galkin
D. Ebert, R.N. Faustov, V.O. Galkin
Heavy hadrons in the relativistic quark model
8 pages, Invited talk given at the XII International Conference on Hadron Spectroscopy (Hadron 07), Frascati, October 8-13, 2007
null
null
null
hep-ph
null
Masses of heavy baryons and tetraquarks are calculated in the relativistic quark model using the heavy-quark--light-diquark and diquark-antidiquark approximations, respectively.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 09:14:53 GMT" } ]
2007-12-05T00:00:00
[ [ "Ebert", "D.", "" ], [ "Faustov", "R. N.", "" ], [ "Galkin", "V. O.", "" ] ]
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712.0461
Andrej Gendiar
Roman Krcmar, Andrej Gendiar, Kouji Ueda and Tomotoshi Nishino
Ising model on hyperbolic lattice studied by corner transfer matrix renormalization group method
9 pages, 12 figures
J. Phys. A: Math. Theor. 41 (2008) 125001
10.1088/1751-8113/41/12/125001
null
cond-mat.stat-mech
null
We study two-dimensional ferromagnetic Ising model on a series of regular lattices, which are represented as the tessellation of polygons with p>=5 sides, such as pentagons (p=5), hexagons (p=6), etc. Such lattices are on hyperbolic planes, which have constant negative scalar curvatures. We calculate critical temperatures and scaling exponents by use of the corner transfer matrix renormalization group method. As a result, the mean-field like phase transition is observed for all the cases p>=5. Convergence of the calculated transition temperatures with respect to p is investigated towards the limit p->infinity, where the system coincides with the Ising model on the Bethe lattice.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 09:26:49 GMT" }, { "version": "v2", "created": "Thu, 24 Jan 2008 15:36:25 GMT" } ]
2008-03-31T00:00:00
[ [ "Krcmar", "Roman", "" ], [ "Gendiar", "Andrej", "" ], [ "Ueda", "Kouji", "" ], [ "Nishino", "Tomotoshi", "" ] ]
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712.0462
Simon Fu
Simon Fu
Molecular Labor Division: Its Cause and Consequence
Content changed
null
null
null
q-bio.PE q-bio.BM q-bio.GN
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Both external environmental selection and internal lower-level evolution are essential for an integral picture of evolution. This paper proposes that the division of internal evolution into DNA/RNA pattern formation (genotype) and protein functional action (phenotype) resolves a universal conflict between fitness and evolvability. Specifically, this paper explains how this universal conflict drove the emergence of genotype-phenotype division, why this labor division is responsible for the extraordinary complexity of life, and how the specific ways of genotype-phenotype mapping in the labor division determine the paths and forms of evolution and development.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 09:28:32 GMT" }, { "version": "v10", "created": "Mon, 7 Jul 2008 09:04:13 GMT" }, { "version": "v11", "created": "Fri, 5 Sep 2008 12:16:35 GMT" }, { "version": "v12", "created": "Tue, 14 Oct 2008 10:04:17 GMT" }, { "version": "v13", "created": "Thu, 23 Oct 2008 08:15:41 GMT" }, { "version": "v14", "created": "Thu, 15 Jan 2009 09:56:10 GMT" }, { "version": "v15", "created": "Mon, 6 Apr 2009 08:37:23 GMT" }, { "version": "v16", "created": "Thu, 23 Apr 2009 02:46:45 GMT" }, { "version": "v17", "created": "Thu, 16 Jul 2009 11:54:52 GMT" }, { "version": "v18", "created": "Sun, 27 Sep 2009 01:11:14 GMT" }, { "version": "v19", "created": "Mon, 5 Oct 2009 08:46:46 GMT" }, { "version": "v2", "created": "Thu, 6 Dec 2007 07:44:28 GMT" }, { "version": "v20", "created": "Mon, 14 Dec 2009 01:00:17 GMT" }, { "version": "v21", "created": "Mon, 19 Apr 2010 04:42:05 GMT" }, { "version": "v22", "created": "Wed, 12 May 2010 06:45:14 GMT" }, { "version": "v23", "created": "Tue, 13 Jul 2010 02:45:56 GMT" }, { "version": "v24", "created": "Thu, 20 Jan 2011 06:08:21 GMT" }, { "version": "v25", "created": "Sun, 21 Aug 2011 07:56:29 GMT" }, { "version": "v3", "created": "Wed, 12 Dec 2007 19:52:35 GMT" }, { "version": "v4", "created": "Wed, 2 Jan 2008 08:12:35 GMT" }, { "version": "v5", "created": "Thu, 10 Jan 2008 18:27:33 GMT" }, { "version": "v6", "created": "Mon, 28 Jan 2008 09:24:49 GMT" }, { "version": "v7", "created": "Sat, 10 May 2008 05:31:04 GMT" }, { "version": "v8", "created": "Tue, 20 May 2008 10:13:58 GMT" }, { "version": "v9", "created": "Sun, 15 Jun 2008 11:02:06 GMT" } ]
2011-08-23T00:00:00
[ [ "Fu", "Simon", "" ] ]
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712.0463
Stefan Popescu
Bernhard Rothenstein and Stefan Popescu
Lorentz transformation, time dilation, length contraction and Doppler Effect - all at once
vers. Nov. 2007, 9 pages, 2 figures
null
null
null
physics.gen-ph
null
We present a simple derivation of the Lorentz transformations for the space-time coordinates of the same event. It is based on the relative character of length and time interval as measured by observes in relative motion. We begin by accepting that the relative motion modifies in some particular way the result of these measurements. However we do not postulate the character of this distortion i.e. whatever it is dilation or contraction. The formulas accounting for length contraction, time dilation and Doppler shift are a byproduct of this derivation.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 09:34:38 GMT" } ]
2007-12-05T00:00:00
[ [ "Rothenstein", "Bernhard", "" ], [ "Popescu", "Stefan", "" ] ]
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712.0464
Valentin Kuzmichev
V. E. Kuzmichev, V. V. Kuzmichev (Bogolyubov Institute for Theoretical Physics)
The Big Bang quantum cosmology: The matter-energy production epoch
16 pages, v.2 a few misprints are corrected and small additional explanations are provided
Acta Phys.Polon.B39:979,2008
null
null
gr-qc astro-ph
null
The exactly solvable quantum model of the homogeneous, isotropic and closed universe in the matter-energy production epoch is considered. It is assumed that the universe is originally filled with a uniform scalar field and a perfect fluid which defines a reference frame. The stationary state spectrum and the wave functions of the quantum universe are calculated. In this model the matter-energy in the universe has a component in the form of a condensate of massive zero-momentum excitation quanta of oscillations of primordial scalar field. The mean value of the scale factor of the universe in a given state is connected with the mass of a condensate by a linear relation. The nucleation rate of the universe from the initial cosmological singularity point is calculated. It is demonstrated that the process of nucleation of the universe can have an exponential (explosive) nature. The evolution of the universe is described as transitions with non-zero probabilities between the states of the universe with different masses of a condensate.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 09:36:50 GMT" }, { "version": "v2", "created": "Wed, 30 Apr 2008 08:59:57 GMT" } ]
2011-07-19T00:00:00
[ [ "Kuzmichev", "V. E.", "", "Bogolyubov Institute for Theoretical\n Physics" ], [ "Kuzmichev", "V. V.", "", "Bogolyubov Institute for Theoretical\n Physics" ] ]
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712.0465
Valentin Kuzmichev
V. E. Kuzmichev, V. V. Kuzmichev (Bogolyubov Institute for Theoretical Physics)
Accelerating Quantum Universe
15 pages, v.2 additional explanations and a few corrections are provided
Acta Phys.Polon.B39:2003-2018,2008
null
null
gr-qc astro-ph
null
The origin of negative pressure fluid (the dark energy) is investigated in the quantum model of the homogeneous, isotropic and closed universe filled with a uniform scalar field and a perfect fluid which defines a reference frame. The equations of the model are reduced to the form which allows a direct comparison between them and the equations of the Einsteinian classical theory of gravity. It is shown that quantized scalar field has a form of a condensate which behaves as an antigravitating medium. The theory predicts an accelerating expansion of the universe even if the vacuum energy density vanishes. An antigravitating effect of a condensate has a purely quantum nature. It is shown that the universe with the parameters close to the Planck ones can go through the period of exponential expansion. The conditions under which in semi-classical approximation the universe looks effectively like spatially flat with negative deceleration parameter are determined. The reduction to the standard model of classical cosmology is discussed.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 09:46:01 GMT" }, { "version": "v2", "created": "Wed, 30 Apr 2008 09:09:27 GMT" } ]
2008-12-19T00:00:00
[ [ "Kuzmichev", "V. E.", "", "Bogolyubov Institute for Theoretical\n Physics" ], [ "Kuzmichev", "V. V.", "", "Bogolyubov Institute for Theoretical\n Physics" ] ]
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712.0466
Paolo Giordano
P. Giordano
Semileptonic B decays and the inclusive determination of |V(ub)|
Dec 2007. 4pp. To appear in the proceedings of the 2007 Europhysics Conference on High Energy Physics (EPS-HEP2007), Manchester, England, 19-25 Jul 2007
J.Phys.Conf.Ser.110:052017,2008
10.1088/1742-6596/110/5/052017
null
hep-ph
null
We present a new theoretical framework for the study of $B\to X_u \ell \nu$ decays, which includes all known perturbative and non-perturbative contributions and a description of leading and subleading Fermi motion effects. The perturbative and non-perturbative regimes are separated by a ``hard'' Wilsonian cutoff $\mu \sim 1$ GeV. We bring into focus some problems related to the high $q^2$ region and to Weak Annihilation effects. We provide estimates of the CKM parameter $|V_{ub}|$ using the described framework and discuss the related theoretical uncertainty.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 09:49:54 GMT" } ]
2008-11-26T00:00:00
[ [ "Giordano", "P.", "" ] ]
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712.0467
Cencini Massimo Dr.
Fabio Cecconi, Massimo Cencini, Angelo Vulpiani
Transport properties in chaotic and non-chaotic many particles systems
23 pgs with 8 Figures
J. Stat. Mech. (2007) P12001
10.1088/1742-5468/2007/12/P12001
null
nlin.CD cond-mat.stat-mech
null
Two deterministic models for Brownian motion are investigated by means of numerical simulations and kinetic theory arguments. The first model consists of a heavy hard disk immersed in a rarefied gas of smaller and lighter hard disks acting as a thermal bath. The second is the same except for the shape of the particles, which is now square. The basic difference of these two systems lies in the interaction: hard core elastic collisions make the dynamics of the disks chaotic whereas that of squares is not. Remarkably, this difference is not reflected in the transport properties of the two systems: simulations show that the diffusion coefficients, velocity correlations and response functions of the heavy impurity are in agreement with kinetic theory for both the chaotic and the non-chaotic model. The relaxation to equilibrium, however, is very sensitive to the kind of interaction. These observations are used to reconsider and discuss some issues connected to chaos, statistical mechanics and diffusion.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 09:50:12 GMT" } ]
2009-11-13T00:00:00
[ [ "Cecconi", "Fabio", "" ], [ "Cencini", "Massimo", "" ], [ "Vulpiani", "Angelo", "" ] ]
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712.0468
Julien Lavalle
Julien Lavalle
Indirect detection of Dark Matter with antimatter: Demystifying the clumpiness boost factors
Proceeding of the SciNeGHE07 workshop (Frascati, Italy, June 2007)
null
null
null
astro-ph
null
The hierarchical scenario of structure formation, in the frame of the $\Lambda$-CDM cosmology, predicts the existence of dark matter (DM) sub-halos down to very small scales, of which the minimal size depends on the microscopic properties of the DM. In the context of annihilating DM, such substructures are expected to enhance the primary cosmic ray (CR) fluxes originating from DM annihilation in the Galaxy. This enhancement has long been invoked to allow predictions of imprints of DM annihilation on the antimatter CR spectra. Taking advantage of the method developed by Lavalle et al (2007b), we (Lavalle et al, 2007a) accurately compute the boost factors for positrons and anti-protons, as well as the associated theoretical and statistical errors. To this aim, we use a compilation of the latest results of cosmological N-body simulations and the theoretical insights found in the literature. We find that sub-halos are not likely to significantly boost the exotic production of antimatter CRs.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 09:53:13 GMT" } ]
2007-12-05T00:00:00
[ [ "Lavalle", "Julien", "" ] ]
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712.0469
Laure Ninove
Marianne Akian, Stephane Gaubert, Laure Ninove
Multiple equilibria of nonhomogeneous Markov chains and self-validating web rankings
22 pages, 4 figures
null
null
null
math.PR math.DS
null
PageRank is a ranking of the web pages that measures how often a given web page is visited by a random surfer on the web graph, for a simple model of web surfing. It seems realistic that PageRank may also have an influence on the behavior of web surfers. We propose here a simple model taking into account the mutual influence between web ranking and web surfing. Our ranking, the T-PageRank, is a nonlinear generalization of the PageRank. It is defined as the limit, if it exists, of some nonlinear iterates. A positive parameter T, the temperature, measures the confidence of the web surfer in the web ranking. We prove that, when the temperature is large enough, the T-PageRank is unique and the iterates converge globally on the domain. But when the temperature is small, there may be several T-PageRanks, that may strongly depend on the initial ranking. Our analysis uses results of nonlinear Perron-Frobenius theory, Hilbert projective metric and Birkhoff's coefficient of ergodicity.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 18:28:22 GMT" } ]
2007-12-05T00:00:00
[ [ "Akian", "Marianne", "" ], [ "Gaubert", "Stephane", "" ], [ "Ninove", "Laure", "" ] ]
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712.047
Christoph Winkler
Christoph Winkler
INTEGRAL and New Classes of High-Mass X-ray Binaries
3 pages, 1 figure, submitted; Proceedings "The nature and evolution of X-ray binaries in diverse environments", St Petersburg/FL, USA, 28 Oct - 02 Nov 2007
AIPConf.Proc.1010:272-274,2008
10.1063/1.2945057
null
astro-ph
null
The gamma-ray observatory INTEGRAL, launched in October 2002, produces a wealth of discoveries and new results on compact high energy Galactic objects, nuclear gamma-ray line emission, diffuse line and continuum emission, cosmic background radiation, AGN and high energy transients. Two important serendipitous discoveries made by the INTEGRAL mission are new classes of X-ray binaries, namely the highly-obscured high-mass X-ray binaries, and the super-giant fast transients. In this paper I will review the current status of these discoveries.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 10:02:40 GMT" } ]
2008-11-26T00:00:00
[ [ "Winkler", "Christoph", "" ] ]
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712.0471
Andrea Gregori
Andrea Gregori
About combinatorics, and observables
63 pages, 39 figures. Version 2: added comments and references, corrected typos and errors
null
null
null
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate the most general "phase space" of configurations, consisting of all possible ways of assigning elementary attributes, "energies", to elementary positions, "cells". We discuss how this space possesses structures that can be approximated by a quantum physics scenario. In particular, we discuss how the Heisenberg's "Uncertainty Principle" and a "universe" with a three-dimensional space arise, and what kind of mechanics rules it.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 10:12:14 GMT" }, { "version": "v2", "created": "Mon, 9 Feb 2009 13:33:52 GMT" } ]
2009-02-09T00:00:00
[ [ "Gregori", "Andrea", "" ] ]
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712.0472
Lorenzo Marrucci
A. Rubano, D. Paparo, F. Miletto Granozio, U. Scotti di Uccio, L. Marrucci
Recombination kinetics of a dense electron-hole plasma in strontium titanate
null
Phys. Rev. B 76, 125115 (2007)
10.1103/PhysRevB.76.125115
null
cond-mat.str-el cond-mat.mtrl-sci physics.optics
null
We investigated the nanosecond-scale time decay of the blue-green light emitted by nominally pure SrTiO$_3$ following the absorption of an intense picosecond laser pulse generating a high density of electron-hole pairs. Two independent components are identified in the fluorescence signal that show a different dynamics with varying excitation intensity, and which can be respectively modeled as a bimolecular and unimolecolar process. An interpretation of the observed recombination kinetics in terms of interacting electron and hole polarons is proposed.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 10:05:02 GMT" } ]
2007-12-05T00:00:00
[ [ "Rubano", "A.", "" ], [ "Paparo", "D.", "" ], [ "Granozio", "F. Miletto", "" ], [ "di Uccio", "U. Scotti", "" ], [ "Marrucci", "L.", "" ] ]
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712.0473
C. Hanhart
C. Hanhart, B. Kubis, J. R. Pelaez
The effect of isospin violation on scalar meson production
8 pages; Talk presented at the XII International Conference on Hadron Spectroscpy, (Hadron 07), Frascati (Rome), 8-13 October 2007
Frascati Phys.Ser.46:523-530,2007
null
FZJ-IKP-TH-2007-35
hep-ph
null
We investigate the isospin-violating mixing of the light scalar mesons a0(980) and f0(980) within the unitarized chiral approach. Isospin-violating effects are considered to leading order in the quark mass difference and electromagnetism. In this approach both resonances are generated through meson-meson dynamics. Our results provide a description of the mixing phenomenon within a framework consistent with chiral symmetry and unitarity, where these resonances are not predominantly quark-antiquark states. We discuss in detail the reactions J/Psi to phi S, where S denotes a suitable pair of pseudo--scalar mesons in the scalar channel, namely pi0 eta, K+K-, and K0 \bar K^0. In this work predictions for the cross section in the kaon channels are given for the first time with isospin violating effects included.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 10:05:36 GMT" } ]
2013-01-16T00:00:00
[ [ "Hanhart", "C.", "" ], [ "Kubis", "B.", "" ], [ "Pelaez", "J. R.", "" ] ]
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712.0474
Antonio Ricco
Antonio Ricco
Linearly foliated Calabi-Yau n-folds I. First-order deformations
9 pages
null
null
null
math.AG hep-th
null
We consider classes of noncompact n-folds with trivial canonical bundle, that are linear foliations on nonsingular projective varieties, in general without a projection to the base. We obtain them as first-order deformations of total spaces of vector bundles on those varieties.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 18:41:01 GMT" } ]
2007-12-05T00:00:00
[ [ "Ricco", "Antonio", "" ] ]
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712.0475
Jean-Francois Berret
Ling Qi, Jean-Paul Chapel, Jean-Christophe Castaing, Jerome Fresnais and Jean-Francois Berret
Organic versus Hybrid Coacervate Complexes : Co-Assembly and Adsorption Properties
9 pages in templated form, 9 figures, paper submitted to Soft Matter
null
null
null
cond-mat.mtrl-sci cond-mat.soft
null
We report the co-assembly and adsorption properties of coacervate complexes made from polyelectrolyte-neutral block copolymers and oppositely charged nanocolloids. The nanocolloids put under scrutiny were ionic surfactant micelles and highly charged 7 nm cerium oxide (CeO2) nanoparticles. Static and dynamic light scattering was used to investigate the microstructure and stability of the organic and hybrid complexes. The microstructure of the CeO2-based complexes was resolved using cryogenic transmission electronic microscopy (Cryo-TEM), and it revealed that the cores were clusters made from densely packed nanoparticles. In the concentration range of interest, c = 10-4 - 1 wt. %, the surfactant-based complexes were shown to exhibit a critical association concentration (cac) whereas the nanoparticle-polymer hybrids did not. The adsorption properties of the same complexes were investigated above the cac by stagnation point adsorption reflectometry. The adsorbed amount was measured as a function of time for polymers and complexes using anionically charged silica and hydrophobic poly(styrene) substrates. It was found that all complexes adsorbed readily on both types of substrates up to a level of 1 - 2 mg m-2 at stationary state. Upon rinsing however, the adsorbed layer was removed for the surfactant-based systems, but not for the cerium oxide clusters. As for the solution properties, these finding were interpreted in terms of a critical association concentrations which are very different for organic and hybrid complexes.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 10:08:25 GMT" } ]
2007-12-05T00:00:00
[ [ "Qi", "Ling", "" ], [ "Chapel", "Jean-Paul", "" ], [ "Castaing", "Jean-Christophe", "" ], [ "Fresnais", "Jerome", "" ], [ "Berret", "Jean-Francois", "" ] ]
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712.0476
Manuel Guedel
M. Guedel, K. R. Briggs, T. Montmerle, M. Audard, L. Rebull, and S.L. Skinner
Million-Degree Plasma Pervading the Extended Orion Nebula
accepted by Science, 23 pg, 7 figs, incl. Supplementary Online Material; this version of the work has been posted by permission of the AAAS. The definitive version was published in Science Express on Nov. 29, 2007, at http://www.sciencemag.org/cgi/content/abstract/1149926; see also http://www.astro.phys.ethz.ch/papers/guedel/papers.html for downloads
null
10.1126/science.1149926
null
astro-ph
null
Most stars form as members of large associations within dense, very cold (10-100 K) molecular clouds. The nearby giant molecular cloud in Orion hosts several thousand stars of ages less than a few million years, many of which are located in or around the famous Orion Nebula, a prominent gas structure illuminated and ionized by a small group of massive stars (the Trapezium). We present X-ray observations obtained with the X-ray Multi-Mirror satellite XMM-Newton revealing that a hot plasma with a temperature of 1.7-2.1 million K pervades the southwest extension of the nebula. The plasma, originating in the strong stellar winds from the Trapezium, flows into the adjacent interstellar medium. This X-ray outflow phenomenon must be widespread throughout our Galaxy.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 16:27:51 GMT" } ]
2007-12-05T00:00:00
[ [ "Guedel", "M.", "" ], [ "Briggs", "K. R.", "" ], [ "Montmerle", "T.", "" ], [ "Audard", "M.", "" ], [ "Rebull", "L.", "" ], [ "Skinner", "S. L.", "" ] ]
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712.0477
Juan Esteban Palomar Taranc\'on
J. E. Palomar Tarancon
An Exact Exprsssion of Pi(x)
2 pages
null
null
null
math.GM
null
The author states an exact expression of the distribution of primes.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 10:16:46 GMT" } ]
2007-12-05T00:00:00
[ [ "Tarancon", "J. E. Palomar", "" ] ]
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712.0478
ILki Kim
Ilki Kim, Guenter Mahler
The second law of thermodynamics in the quantum Brownian oscillator at an arbitrary temperature
Accepted for publication in EPJ B
null
10.1140/epjb/e2007-00354-5
null
quant-ph
null
In the classical limit no work is needed to couple a system to a bath with sufficiently weak coupling strength (or with arbitrarily finite coupling strength for a linear system) at the same temperature. In the quantum domain this may be expected to change due to system-bath entanglement. Here we show analytically that the work needed to couple a single linear oscillator with finite strength to a bath cannot be less than the work obtainable from the oscillator when it decouples from the bath. Therefore, the quantum second law holds for an arbitrary temperature. This is a generalization of the previous results for zero temperature [1,2]; in the high temperature limit we recover the classical behavior.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 10:18:56 GMT" } ]
2009-11-13T00:00:00
[ [ "Kim", "Ilki", "" ], [ "Mahler", "Guenter", "" ] ]
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