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801.0773
Chang Qing Sun Dr
Chang Q. Sun
Stimulus dependence of the collective vibration of atoms in an icosahedral cluster
null
null
null
null
cond-mat.mes-hall
null
Molecular dynamics calculations of the vibrational behavior of atoms in a Lennard-Jones 147-atom cluster revealed that the relaxation and the stability of the collective vibration of atoms in the cluster depend on the extent of the mechanical disturbance. A relatively larger-scale perturbation will cause a faster decay of the vibration magnitude, the potential and the kinetic energy compared to the vibration stimulated by a small-scale stimulus.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 02:44:33 GMT" } ]
2008-01-08T00:00:00
[ [ "Sun", "Chang Q.", "" ] ]
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801.0774
Chang Qing Sun Dr
Chang Q. Sun
Shell-resolved melting kinetics of an icosahedral cluster
null
null
null
null
cond-mat.mes-hall
null
Molecular dynamics calculations of the fluctuation of bond vibration revealed the shell-resolved kinetics of surface melting of closed-shelled cluster containing 147atoms with Lennard-Jones type interaction. It is found that the surface melting is imitated by the migrating of the vertex atoms and the melting process can be divided into three major stages, i.e., vertex migrating, surface melting, and general melting. Although the melting process of the LJ147 cluster could be divided into discrete stages of shell-by-shell surface melting, in general, there is still a continuous process of melting from the surface to the core interior.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 02:47:06 GMT" } ]
2008-01-08T00:00:00
[ [ "Sun", "Chang Q.", "" ] ]
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801.0775
Chang Qing Sun Dr
Chang Q. Sun
The kinetics and modes of gold nanowire breaking
null
null
null
null
cond-mat.mes-hall
null
Molecular dynamics calculations revealed that the temperature of operation and the applied tensile force (f) determine not only the kinetics but also the mode and duration of Au nanowire breaking. In the tensile force range of 0.018 and 0.1 nN/atom, structure transformation of the wire occurs prior to breaking at random positions. The gold wire breaks abruptly when the f is stronger than 0.1nN/atom but no rupture occurs at all when the f is weaker than 0.018 nN/atom. At higher temperatures and under stronger tensile forces, the wire breaks even faster.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 02:52:12 GMT" } ]
2008-01-08T00:00:00
[ [ "Sun", "Chang Q.", "" ] ]
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801.0776
R. Jeffrey Wilkes
The Super-Kamiokande Collaboration, K. Abe, et al
Search for Matter-Dependent Atmospheric Neutrino Oscillations in Super-Kamiokande
6 pages, 1 figure
Phys.Rev.D77:052001,2008
10.1103/PhysRevD.77.052001
null
hep-ex
null
We consider muon neutrino to tau neutrino oscillations in the context of the Mass Varying Neutrino (MaVaN) model, where the neutrino mass can vary depending on the electron density along the flight path of the neutrino. Our analysis assumes a mechanism with dependence only upon the electron density, hence ordinary matter density, of the medium through which the neutrino travels. Fully-contained, partially-contained and upward-going muon atmospheric neutrino data from the Super--Kamiokande detector, taken from the entire SK--I period of 1489 live days, are compared to MaVaN model predictions. We find that, for the case of 2-flavor oscillations, and for the specific models tested, oscillation independent of electron density is favored over density dependence. Assuming maximal mixing, the best-fit case and the density-independent case do not differ significantly.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 03:13:24 GMT" } ]
2008-11-26T00:00:00
[ [ "Kamiokande Collaboration", "", "" ], [ "Abe", "K.", "" ] ]
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801.0777
Alexander Katz
Genady Ya. Grabarnik and Alexander A. Katz
A Note on Banach Principle for JW-algebras
5 pages
null
null
null
math.FA math.OA
null
In the sequel we establish the Banach Principle for semifinite JW-algebras without direct summand of type I sub 2, which extends the recent results of Chilin and Litvinov on the Banach Principle for semifinite von Neumann algebras to the case of JW-algebras.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 03:35:34 GMT" } ]
2008-01-08T00:00:00
[ [ "Grabarnik", "Genady Ya.", "" ], [ "Katz", "Alexander A.", "" ] ]
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801.0778
Viacheslav Kuznetsov
V. Kuznetsov, M. V. Polyakov, T. Boiko, J. Jang, A. Kim, W. Kim, A. Ni, G. Yang
Photoproduction off the nucleon revisited: Evidence for a narrow N(1688) resonance?
Contribution to the Workshop on the Physics of the Excited Nucleons NSTAR2007, Bonn, Germany, Sept. 5 - 8 2007. To be published in Eur.Phys.J.A
null
10.1007/978-3-540-85144-8_33
null
hep-ex
null
Revised analysis of $\Sigma$ beam asymmetry for the $\eta$ photoproduction on the free proton reveals a structure at $W\sim 1.69$ GeV. Fit of the experimental data based on the E429 solution of the SAID partial wave analysis suggests a narrow ($\Gamma \leq 25$ MeV) resonance. Possible candidates are $P_{11}, P_{13}$, or $D_{13}$ resonances. The result is considered in conjunction with the recent evidence for a bump-like structure at $W\sim 1.67 - 1.68$ GeV in the quasi-free $\eta$ photoproduction on the neutron.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 04:28:56 GMT" } ]
2015-05-13T00:00:00
[ [ "Kuznetsov", "V.", "" ], [ "Polyakov", "M. V.", "" ], [ "Boiko", "T.", "" ], [ "Jang", "J.", "" ], [ "Kim", "A.", "" ], [ "Kim", "W.", "" ], [ "Ni", "A.", "" ], [ "Yang", "G.", "" ] ]
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801.0779
X. F. Sun
X. F. Sun (USTC), A. A. Taskin (CRIEPI), X. Zhao (USTC), A. N. Lavrov (IIC), Yoichi Ando (Osaka Univ.)
Large magnetothermal conductivity in GdBaCo_{2}O_{5+x} single crystals
5 pages, 5 figures, accepted for publication in Phys. Rev. B
Phys. Rev. B 77, 054436 (2008)
10.1103/PhysRevB.77.054436
null
cond-mat.str-el
null
To study the effects of paramagnetic spins on phonons, both the in-plane and the c-axis heat transport of GdBaCo_{2}O_{5+x} (GBCO) single crystals are measured at low temperature down to 0.36 K and in magnetic field up to 16 T. It is found that the phonon heat transport is very strongly affected by the magnetic field and nearly 5 times increase of the thermal conductivity in several Tesla field is observed at 0.36 K. It appears that phonons are resonantly scattered by paramagnetic spins in zero field and the application of magnetic field removes such strong scattering, but the detailed mechanism is to be elucidated.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 04:29:16 GMT" } ]
2008-02-28T00:00:00
[ [ "Sun", "X. F.", "", "USTC" ], [ "Taskin", "A. A.", "", "CRIEPI" ], [ "Zhao", "X.", "", "USTC" ], [ "Lavrov", "A. N.", "", "IIC" ], [ "Ando", "Yoichi", "", "Osaka Univ." ] ]
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801.078
Fu-Gao Song
Fu-gao Song
The Distance of GRB is Independent from the Redshift
48 pages, 17 figures
null
null
null
physics.gen-ph
null
Although it is acknowledged that GRB redshift is cosmological at present, but it in fact has never been confirmed. However, the fact is still unclear because which may be cosmological redshift (including possibly the host galaxy redshift or the background galaxy redshift) or the redshift results from gravity of neutron star; in other words, GRB redshift may be related to its distance or not. Here, I enumerate a series of evidences, including three methods, to determine whether the GRB distance does depend on the redshift. Firstly, the correlation analysis shows that there is no correlation between the fluence of 131 GRBs (and the 1 s peak photon flux of 111 GRBs) and the redshift although there is a significant correlation between the apparent magnitude of 32 hosts and the redshift. Secondly, from the number-redshift relation of GRBs and the deductive reasoning, one can deduce an absurd conclusion that the probability of a nearby galaxy generating a GRB event would vary inversely as its distance square if GRB indeed comes from an external galaxy and the distance depends on the redshift. Thirdly, if the distance is related to the redshift, then the variables of fluence and peak flux definitely cannot be separated from the variable of redshift in distribution functions of both the fluence-redshift and the peak flux-redshift; while the variables separation tests show that they in effect do, and we then can exactly forecast the values of the fluence and the peak flux for the GRBs with redshift z > 4.5. Other evidences all show that GRB distance is independent from the redshift without exception.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 04:46:13 GMT" }, { "version": "v2", "created": "Wed, 23 Jan 2008 04:43:46 GMT" }, { "version": "v3", "created": "Tue, 20 May 2008 01:47:20 GMT" } ]
2008-06-02T00:00:00
[ [ "Song", "Fu-gao", "" ] ]
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801.0781
Daniel Lacour
J. Briones (LPM), F. Montaigne (LPM), Daniel Lacour (LPM), M. Hehn (LPM), M. J. Carey, J. R. Childress
Magnetic domain wall propagation in a submicron spin-valve stripe: influence of the pinned layer
null
Applied Physics Letters 92 (2008) 032508
10.1063/1.2835201
null
cond-mat.mtrl-sci
null
The propagation of a domain wall in a submicron ferromagnetic spin-valve stripe is investigated using giant magnetoresistance. A notch in the stripe efficiently traps an injected wall stopping the domain propagation. The authors show that the magnetic field at which the wall is depinned displays a stochastic nature. Moreover, the depinning statistics are significantly different for head to head and tail-to-tail domain walls. This is attributed to the dipolar field generated in the vicinity of the notch by the pinned layer of the spin-valve.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 15:47:23 GMT" } ]
2008-04-02T00:00:00
[ [ "Briones", "J.", "", "LPM" ], [ "Montaigne", "F.", "", "LPM" ], [ "Lacour", "Daniel", "", "LPM" ], [ "Hehn", "M.", "", "LPM" ], [ "Carey", "M. J.", "" ], [ "Childress", "J. R.", "" ] ]
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801.0782
Makoto Hashimoto
M. Hashimoto, T. Yoshida, H. Yagi, M. Takizawa, A. Fujimori, M. Kubota, K. Ono, K. Tanaka, D.H. Lu, Z.-X. Shen, S. Ono, Yoichi Ando
Doping evolution of the electronic structure in the single-layer cuprates Bi$_2$Sr$_{2-x}$La$_x$CuO$_{6+\delta}$: Comparison with other single-layer cuprates
null
Phys. Rev. B 77, 094516 (2008)
10.1103/PhysRevB.77.094516
null
cond-mat.supr-con cond-mat.str-el
null
We have performed angle-resolved photoemission and core-level x-ray photoemission studies of the single-layer cuprate Bi$_2$Sr$_{2-x}$La$_x$CuO$_{6+\delta}$ (Bi2201) and revealed the doping evolution of the electronic structure from the lightly-doped to optimally-doped regions. We have observed the formation of the dispersive quasi-particle band, evolution of the Fermi ``arc'' into the Fermi surface and the shift of the chemical potential with hole doping as in other cuprates. The doping evolution in Bi2201 is similar to that in Ca$_{2-x}$Na$_{x}$CuO$_{2}$Cl$_2$ (Na-CCOC), where a rapid chemical potential shift toward the lower Hubbard band of the parent insulator has been observed, but is quite different from that in La$_{2-x}$Sr$_{x}$CuO$_{4}$ (LSCO), where the chemical potential does not shift, yet the dispersive band and the Fermi arc/surface are formed around the Fermi level already in the lightly-doped region. The (underlying) Fermi surface shape and band dispersions are quantitatively analyzed using tight-binding fit, and the deduced next-nearest-neighbor hopping integral $t'$ also confirm the similarity to Na-CCOC and the difference from LSCO.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 05:54:34 GMT" }, { "version": "v2", "created": "Tue, 11 Mar 2008 02:28:07 GMT" } ]
2008-04-19T00:00:00
[ [ "Hashimoto", "M.", "" ], [ "Yoshida", "T.", "" ], [ "Yagi", "H.", "" ], [ "Takizawa", "M.", "" ], [ "Fujimori", "A.", "" ], [ "Kubota", "M.", "" ], [ "Ono", "K.", "" ], [ "Tanaka", "K.", "" ], [ "Lu", "D. H.", "" ], [ "Shen", "Z. -X.", "" ], [ "Ono", "S.", "" ], [ "Ando", "Yoichi", "" ] ]
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801.0783
Guray Erkol
G. Erkol and M. Oka
Finite-width effects on Delta baryons in QCD Sum Rules
16 pages, 1 figure; to be published in Nucl. Phys. A
Nucl.Phys.A801:142-153,2008
10.1016/j.nuclphysa.2008.01.001
null
nucl-th hep-ph
null
The quantum chromodynamics (QCD) sum rules for the Delta baryons are analyzed by taking into account the finite-width effects, through explicit utilization of the Breit-Wigner shape. We apply a Monte-Carlo based analysis to the 'traditional' and the parity-projected sum rules. The first Delta excitation state is also considered as a sub-continuum resonance and the widths are calculated using the mass values as input.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 06:26:29 GMT" } ]
2008-11-26T00:00:00
[ [ "Erkol", "G.", "" ], [ "Oka", "M.", "" ] ]
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801.0784
Carlos Bertulani
C.A. Bertulani, M.S. Hussein, and G. Verde
Blurred femtoscopy in two-proton decay
5 pages. 4 figures, accepted for publication in Phys. Lett. B
Phys.Lett.B666:86-90,2008
10.1016/j.physletb.2008.06.062
null
nucl-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the effects of final state interactions in two-proton emission by nuclei. Our approach is based on the solution the time-dependent Schr\"odinger equation. We show that the final relative energy between the protons is substantially influenced by the final state interactions. We also show that alternative correlation functions can be constructed showing large sensitivity to the spin of the diproton system.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 06:48:22 GMT" }, { "version": "v2", "created": "Tue, 5 Feb 2008 01:57:44 GMT" }, { "version": "v3", "created": "Tue, 17 Jun 2008 03:26:09 GMT" } ]
2008-11-26T00:00:00
[ [ "Bertulani", "C. A.", "" ], [ "Hussein", "M. S.", "" ], [ "Verde", "G.", "" ] ]
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801.0785
EDA Publishing Association
Z. W. Douglas, M. K. Smith, A. Glezer
Acoustically Enhanced Boiling Heat Transfer
Submitted on behalf of TIMA Editions (http://irevues.inist.fr/tima-editions)
Dans 13th International Worshop on THERMal INvestigations of ICs and Systems - THERMINIC 2007, Budapest : Hongrie (2007)
null
null
physics.gen-ph
null
An acoustic field is used to increase the critical heat flux (CHF) of a flat-boiling-heat-transfer surface. The increase is a result of the acoustic effects on the vapor bubbles. Experiments are performed to explore the effects of an acoustic field on vapor bubbles in the vicinity of a rigid-heated wall. Work includes the construction of a novel heater used to produce a single vapor bubble of a prescribed size and at a prescribed location on a flatboiling surface for better study of an individual vapor bubble's reaction to the acoustic field. Work also includes application of the results from the single-bubble heater to a calibrated-copper heater used for quantifying the improvements in CHF.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 16:22:15 GMT" } ]
2008-01-08T00:00:00
[ [ "Douglas", "Z. W.", "" ], [ "Smith", "M. K.", "" ], [ "Glezer", "A.", "" ] ]
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801.0786
Fu-Gao Song
Fu-Gao Song
Sifting Function Partition for the Goldbach Problem
27 pages, 0 figure
null
null
null
math.GM
null
All sieve methods for the Goldbach problem sift out all the composite numbers; even though, strictly speaking, it is not necessary to do so and which is, in general, very difficult. Some new methods introduced in this paper show that the Goldbach problem can be solved under sifting out only some composite numbers. In fact, in order to prove the Goldbach conjecture, it is only necessary to show that there are prime numbers left in the residual integers after the initial sifting! This idea can be implemented by using one of the three methods called sifting function partition by integer sort, sifting function partition by intervals and comparative sieve method, respectively. These are feasible methods for solving both the Goldbach problem and the problem of twin primes. An added bonus of the above methods is the elimination of the indeterminacy of the sifting functions brought about by their upper and lower bounds.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 07:33:08 GMT" } ]
2008-01-08T00:00:00
[ [ "Song", "Fu-Gao", "" ] ]
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801.0787
Koji Fukao
Koji Fukao and Hiroki Koizumi
Aging phenomena in polystyrene thin films
4 pages, 2 figures
Eur. Phys. J. Special Topics 141, 199-202 (2007)
null
null
cond-mat.soft
null
The aging behavior is investigated for thin films of atactic polystyrene through measurements of complex electric capacitance. During isothermal aging process the real part of the electric capacitance increases with aging time, while the imaginary part decreases with aging time. This result suggests that the aging time dependence of the real and imaginary parts are mainly associated with change in thickness and dielectric permittivity, respectively. In thin films, the thickness depends on thermal history of aging even above the glass transition. Memory and `rejuvenation' effects are also observed in the thin films.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 07:55:48 GMT" } ]
2008-01-08T00:00:00
[ [ "Fukao", "Koji", "" ], [ "Koizumi", "Hiroki", "" ] ]
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801.0788
Johann Rafelski
Inga Kuznetsova (Arizona) and Johann Rafelski (Arizona)
Non-Equilibrium Heavy Flavored Hadron Yields from Chemical Equilibrium Strangeness-Rich QGP
Presented at SQM07, to appear in JPG special issue
J.Phys.G35:044043,2008
10.1088/0954-3899/35/4/044043
null
hep-ph
null
The yields of heavy flavored hadrons emitted from strangeness-rich QGP are evaluated within chemical non-equilibrium statistical hadronization model, conserving strangeness, charm, and entropy yields at hadronization.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 08:03:23 GMT" } ]
2008-11-26T00:00:00
[ [ "Kuznetsova", "Inga", "", "Arizona" ], [ "Rafelski", "Johann", "", "Arizona" ] ]
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801.0789
Gongwei Lin
Gong-Wei Lin, Xu-Bo Zou, Ming-Yong Ye, Xiu-Min Lin, Guang-Can Guo
Frequency-up conversion and quantum swap gate in an optical cavity with atomic cloud
5 pages,3 figures
Phys. Rev. A 77, 064301 (2008)
null
null
quant-ph
null
A scheme is presented for realizing frequency-up conversion and a two-qubit quantum swap gate for intracavity fields. In the scheme, a V-type atomic ensemble prepared in their ground states collectively mediates the interaction between the two cavity modes. Under certain conditions, the cavity-field degree of freedom is decoupled from the atomic degrees of freedom, and the effective coupling strength between the two cavity modes scales up with $\sqrt{N}$ ($N$ is the number of atoms). The numerical simulation shows that the quantum swap gate still has a high fidelity under the influence of the atomic spontaneous emission and the decay of the cavity modes.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 08:12:10 GMT" } ]
2008-07-13T00:00:00
[ [ "Lin", "Gong-Wei", "" ], [ "Zou", "Xu-Bo", "" ], [ "Ye", "Ming-Yong", "" ], [ "Lin", "Xiu-Min", "" ], [ "Guo", "Guang-Can", "" ] ]
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801.079
Koji Fukao
Rodney D. Priestley, Linda J. Broadbelt, John M. Torkelson, Koji Fukao
Glass transition and alpha-relaxation dynamics of thin films of labeled polystyrene
10 pages, 11 figures, 2 Tables
Phys. Rev. E75, 061806 (2007) (10 pages)
10.1103/PhysRevE.75.061806
null
cond-mat.soft
null
The glass transition temperature and relaxation dynamics of the segmental motions of thin films of polystyrene labeled with a dye, 4-[N-ethyl-N-(hydroxyethyl)]amino-4-nitraozobenzene (Disperse Red 1, DR1) are investigated using dielectric measurements. The dielectric relaxation strength of the DR1-labeled polystyrene is approximately 65 times larger than that of the unlabeled polystyrene above the glass transition, while there is almost no difference between them below the glass transition. The glass transition temperature of the DR1-labeled polystyrene can be determined as a crossover temperature at which the temperature coefficient of the electric capacitance changes from the value of the glassy state to that of the liquid state. The glass transition temperature of the DR1-labeled polystyrene decreases with decreasing film thickness in a reasonably similar manner to that of the unlabeled polystyrene thin films. The dielectric relaxation spectrum of the DR1-labeled polystyrene is also investigated. As thickness decreases, the $\alpha$-relaxation time becomes smaller and the distribution of the $\alpha$-relaxation times becomes broader. These results show that thin films of DR1-labeled polystyrene are a suitable system for investigating confinement effects of the glass transition dynamics using dielectric relaxation spectroscopy.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 08:25:06 GMT" } ]
2009-11-13T00:00:00
[ [ "Priestley", "Rodney D.", "" ], [ "Broadbelt", "Linda J.", "" ], [ "Torkelson", "John M.", "" ], [ "Fukao", "Koji", "" ] ]
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801.0791
Kedar Damle
Arnab Sen, Prasenjit Dutt, Kedar Damle, R. Moessner
Variational wavefunction study of the triangular lattice supersolid
4 pages, 2-column PRL format; v2: minor typos fixed
Phys. Rev. Lett. 100, 147204 (2008)
10.1103/PhysRevLett.100.147204
null
cond-mat.stat-mech cond-mat.str-el
null
We present a variational wavefunction which explains the behaviour of the supersolid state formed by hard-core bosons on the triangular lattice. The wavefunction is a linear superposition of {\em only and all} configurations minimising the repulsion between the bosons (which it thus implements as a hard constraint). Its properties can be evaluated exactly--in particular, the variational minimisation of the energy yields (i) the surprising and initially controversial spontaneous density deviation from half-filling (ii) a quantitatively accurate estimate of the corresponding density wave (solid) order parameter.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 05:06:14 GMT" }, { "version": "v2", "created": "Wed, 9 Jan 2008 08:35:22 GMT" } ]
2009-11-13T00:00:00
[ [ "Sen", "Arnab", "" ], [ "Dutt", "Prasenjit", "" ], [ "Damle", "Kedar", "" ], [ "Moessner", "R.", "" ] ]
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801.0792
Wei-Xing Zhou
Li-Jun Ji, Wei-Xing Zhou, Hai-feng Liu, Xin Gong, Fu-Chen Wang, Zun-Hong Yu (ECUST)
Long-term temporal dependence of droplets transiting through a fixed spatial point in gas-liquid twophase turbulent jets
16 Elsart pages including 8 eps figures
Physica A 388 (17), 3345-3354 (2009)
10.1016/j.physa.2009.05.006
null
physics.flu-dyn
null
We perform rescaled range analysis upon the signals measured by Dual Particle Dynamical Analyzer in gas-liquid two-phase turbulent jets. A novel rescaled range analysis is proposed to investigate these unevenly sampled signals. The Hurst exponents of velocity and other passive scalars in the bulk of spray are obtained to be 0.59$\pm $0.02 and the fractal dimension is hence 1.41$\pm $ 0.02, which are in remarkable agreement with and much more precise than previous results. These scaling exponents are found to be independent of the configuration and dimensions of the nozzle and the fluid flows. Therefore, such type of systems form a universality class with invariant scaling properties.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 08:26:18 GMT" } ]
2012-10-08T00:00:00
[ [ "Ji", "Li-Jun", "", "ECUST" ], [ "Zhou", "Wei-Xing", "", "ECUST" ], [ "Liu", "Hai-feng", "", "ECUST" ], [ "Gong", "Xin", "", "ECUST" ], [ "Wang", "Fu-Chen", "", "ECUST" ], [ "Yu", "Zun-Hong", "", "ECUST" ] ]
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801.0793
Paul A. Wiegert
Paul A. Wiegert, Martin Houde and Ruisheng Peng
An Upper Limit on Gas Production from 3200 Phaethon
null
null
10.1016/j.icarus.2007.12.013
null
astro-ph
null
Asteroid 3200 Phaethon resembles a comet in some ways, including a highly-eccentric orbit (e=0.89) and a strong associated meteor shower (the Geminids). Yet this object has never been observed to exhibit any cometary activity, i.e., gas production. We observed 3200 Phaethon with the Caltech Submillimeter Observatory on two occasions, once while it was near its closest approach to Earth as it neared perihelion, and another while it was further from Earth post-perihelion. Observations of the J=2-1 and J=3-2 rotational transitions of 12CO, typically strong lines in comets and indicative of gas production, yielded no detection. Upper limits on the 12CO production of 1.8e28 molecules/s and 7.6e28 molecules/s for Phaethon were determined on these two occasions.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 20:53:13 GMT" } ]
2009-11-13T00:00:00
[ [ "Wiegert", "Paul A.", "" ], [ "Houde", "Martin", "" ], [ "Peng", "Ruisheng", "" ] ]
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801.0794
Koji Fukao
Koji Fukao and Sinpei Yamawaki
Crossover of aging dynamics in polymer glass: from cumulative aging to non-cumulative aging
7 pages, 6 figures
Phys. Rev. E76, 021507 (2007) (6 pages)
10.1103/PhysRevE.76.021507
null
cond-mat.soft
null
The aging behavior of polymer glass, poly(methyl methacrylate), has been investigated through the measurement of ac dielectric susceptibility ata fixed frequency after a temperature shift $\Delta T$ ($\le $ 20 K)between two temperatures, $T_1$ and $T_2$. A crossover from cumulative aging to non-cumulative aging could be observed with increasing $\Delta T$ using a twin temperature ($T$-) shift measurement. Based on a growth law of a dynamical coherent length given by activated dynamics, we obtained a unique coherent length for positive and negative $T$-shifts. The possibility of the existence of temperature chaos in polymer glasses is discussed.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 08:34:54 GMT" } ]
2009-11-13T00:00:00
[ [ "Fukao", "Koji", "" ], [ "Yamawaki", "Sinpei", "" ] ]
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801.0795
Koji Fukao
Koji Fukao and Hiroki Koizumi
Glassy dynamics in thin films of polystyrene
7 pages, 7 figures. Phys. Rev. E (in press)
null
10.1103/PhysRevE.77.021503
null
cond-mat.soft
null
Glassy dynamics was investigated for thin films of atactic polystyrene by complex electric capacitance measurements using dielectric relaxation spectroscopy. During the isothermal aging process the real part of the electric capacitance increased with time, whereas the imaginary part decreased with time. It follows that the aging time dependences of real and imaginary parts of the electric capacitance were primarily associated with change in volume (film thickness) and dielectric permittivity, respectively. Further, dielectric permittivity showed memory and rejuvenation effects in a similar manner to those observed for poly(methyl methacrylate) thin films. On the other hand, volume did not show a strong rejuvenation effect.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 08:41:09 GMT" } ]
2009-11-13T00:00:00
[ [ "Fukao", "Koji", "" ], [ "Koizumi", "Hiroki", "" ] ]
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801.0796
Wang Weiming
Weiming Wang, Lei Zhang, Hailing Wang, Zhenqing Li
Pattern formation of a predator-prey system with Ivlev-type functional response
null
null
null
null
q-bio.PE
null
In this paper, we investigate the emergence of a predator-prey system with Ivlev-type functional response and reaction-diffusion. We study how diffusion affects the stability of predator-prey coexistence equilibrium and derive the conditions for Hopf and Turing bifurcation in the spatial domain. Based on the bifurcation analysis, we give the spatial pattern formation, the evolution process of the system near the coexistence equilibrium point, via numerical simulation. We find that pure Hopf instability leads to the formation of spiral patterns and pure Turing instability destroys the spiral pattern and leads to the formation of chaotic spatial pattern. Furthermore, we perform three categories of initial perturbations which predators are introduced in a small domain to the coexistence equilibrium point to illustrate the emergence of spatiotemporal patterns, we also find that in the beginning of evolution of the spatial pattern, the special initial conditions have an effect on the formation of spatial patterns, though the effect is less and less with the more and more iterations. This indicates that for prey-dependent type predator-prey model, pattern formations do depend on the initial conditions, while for predator-dependent type they do not. Our results show that modeling by reaction-diffusion equations is an appropriate tool for investigating fundamental mechanisms of complex spatiotemporal dynamics.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 09:08:50 GMT" } ]
2008-01-08T00:00:00
[ [ "Wang", "Weiming", "" ], [ "Zhang", "Lei", "" ], [ "Wang", "Hailing", "" ], [ "Li", "Zhenqing", "" ] ]
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801.0797
Wang Weiming
Weiming Wang, Lei Zhang, Yakui Xue, Zhen Jin
Spatiotemporal pattern formation of Beddington-DeAngelis-type predator-prey model
null
null
null
null
q-bio.PE
null
In this paper, we investigate the emergence of a predator-prey model with Beddington-DeAngelis-type functional response and reaction-diffusion. We derive the conditions for Hopf and Turing bifurcation on the spatial domain. Based on the stability and bifurcation analysis, we give the spatial pattern formation via numerical simulation, i.e., the evolution process of the model near the coexistence equilibrium point. We find that for the model we consider, pure Turing instability gives birth to the spotted pattern, pure Hopf instability gives birth to the spiral wave pattern, and both Hopf and Turing instability give birth to stripe-like pattern. Our results show that reaction-diffusion model is an appropriate tool for investigating fundamental mechanism of complex spatiotemporal dynamics. It will be useful for studying the dynamic complexity of ecosystems.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 09:36:45 GMT" } ]
2008-01-08T00:00:00
[ [ "Wang", "Weiming", "" ], [ "Zhang", "Lei", "" ], [ "Xue", "Yakui", "" ], [ "Jin", "Zhen", "" ] ]
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801.0798
Thotsaporn Thanatipanonda
Thotsaporn "Aek" Thanatipanonda
On the monochromatic Schur Triples type problem
10 pages, 3 fugures
null
null
null
math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We discuss a problem posed by Ronald Graham about the minimum number, over all 2-colorings of $[1,n]$, of monochromatic $\{x,y,x+ay\}$ triples for $a \geq 1$. We give a new proof of the original case of $a=1$. We show that the minimum number of such triples is at most $\frac{n^2}{2a(a^2+2a+3)} + O(n)$ when $a \geq 2$. We also find a new upper bound for the minimum number, over all $r$-colorings of $[1,n]$, of monochromatic Schur triples, for $r \geq 3$.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 10:10:59 GMT" }, { "version": "v2", "created": "Wed, 28 Sep 2016 01:08:53 GMT" } ]
2016-09-29T00:00:00
[ [ "Thanatipanonda", "Thotsaporn \"Aek\"", "" ] ]
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801.0799
Gerhard C. Hegerfeldt
G. C. Hegerfeldt and J.T. Neumann
The Aharonov-Bohm effect: the role of tunneling and associated forces
13 pages, 3 figures; minor changes, references added, typo corrected in eq. (16). Accepted for publication in Journal of Physics A
J. Phys. A: Math. Theor. 41 (2008) 155305
10.1088/1751-8113/41/15/155305
null
quant-ph
null
Through tunneling, or barrier penetration, small wavefunction tails can enter a finitely shielded cylinder with a magnetic field inside. When the shielding increases to infinity the Lorentz force goes to zero together with these tails. However, it is shown, by considering the radial derivative of the wavefunction on the cylinder surface, that a flux dependent force remains. This force explains in a natural way the Aharonov-Bohm effect in the idealized case of infinite shielding.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 10:56:37 GMT" }, { "version": "v2", "created": "Wed, 27 Feb 2008 18:20:31 GMT" } ]
2009-11-13T00:00:00
[ [ "Hegerfeldt", "G. C.", "" ], [ "Neumann", "J. T.", "" ] ]
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801.08
M\'at\'e Csan\'ad
M. Csanad and T. Csorgo
Kaon HBT radii from perfect fluid dynamics using the Buda-Lund model
4 pages, 1 figure, presented at the 37th International Symposium on Multiparticle Dynamics in Berkeley
Acta Phys.Polon.Supp.1:521-524,2008
null
null
nucl-th
null
In this paper we summarize the ellipsoidally symmetric Buda-Lund model's results on HBT radii. We calculate the Bose-Einstein correlation function from the model and derive formulas for the transverse momentum dependence of the correlation radii in the Bertsch-Pratt system of out, side and longitudinal directions. We show a comparison to $\sqrt{s_{\rm NN}}=200 GeV$ RHIC PHENIX two-pion correlation data and make prediction on the same observable for different particles.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 12:00:57 GMT" } ]
2009-01-16T00:00:00
[ [ "Csanad", "M.", "" ], [ "Csorgo", "T.", "" ] ]
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801.0801
Mirjam Cvetic
Mirjam Cvetic, Marko Robnik
Gravity Trapping on a Finite Thickness Domain Wall: An Analytic Study
12 pages, 3 figures
Phys.Rev.D77:124003,2008
10.1103/PhysRevD.77.124003
UPR-1191-T
hep-th hep-ph
null
We construct an explicit model of gravity trapping domain wall potential where for the first time we can study explicitly the graviton wave function fluctuations for any thickness of the domain wall. A concrete form of the potential depends on one parameter 0 <= x <= pi/2, which effectively parameterizes the thickness of the domain wall with specific limits x -> 0 and x -> pi/2 corresponding to the thin and the thick wall, respectively. The analysis of the continuum Kaluza Klein fluctuations yields explicit expressions for both the small and large Kaluza Klein energy. We also derive specific explicit conditions in the regime x > 1, for which the fluctuation modes exhibit a resonance behaviour, and which could sizably affect the modifications of the four-dimensional Newton's law at distances, which typically are by four orders of magnitude larger than those relevant for Newton's law modifications of thin walls.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 21:00:00 GMT" } ]
2008-11-26T00:00:00
[ [ "Cvetic", "Mirjam", "" ], [ "Robnik", "Marko", "" ] ]
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801.0802
Mehdi Saeedi
Mehdi Saeedi, Mehdi Sedighi, Morteza Saheb Zamani
A Novel Synthesis Algorithm for Reversible Circuits
4 pages, 4 figures, 1 table Proceedings of the 2007 IEEE/ACM international conference on Computer-aided design
null
10.1109/ICCAD.2007.4397245
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, a new non-search based synthesis algorithm for reversible circuits is proposed. Compared with the widely used search-based methods, our algorithm is guarantied to produce a result and can lead to a solution with much fewer steps. To evaluate the proposed method, several circuits taken from the literature are used. The experimental results corroborate the expected findings.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 12:12:55 GMT" }, { "version": "v2", "created": "Fri, 9 Apr 2010 08:45:51 GMT" } ]
2010-04-12T00:00:00
[ [ "Saeedi", "Mehdi", "" ], [ "Sedighi", "Mehdi", "" ], [ "Zamani", "Morteza Saheb", "" ] ]
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801.0803
Jonathan Dinkelbach
Jonathan Dinkelbach, Bernhard Leeb
Equivariant Ricci flow with surgery and applications to finite group actions on geometric 3-manifolds
36 pages. Final version, to appear in Geometry & Topology. Main Theorem extended to actions on hyperbolic 3-manifolds with cusps
null
null
null
math.GT math.DG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We apply an equivariant version of Perelman's Ricci flow with surgery to study smooth actions by finite groups on closed 3-manifolds. Our main result is that such actions on elliptic and hyperbolic 3-manifolds are conjugate to isometric actions. Combining our results with results by Meeks and Scott [17], it follows that such actions on geometric 3-manifolds (in the sense of Thurston) are always geometric, i.e. there exist invariant locally homogeneous Riemannian metrics. This answers a question posed by Thurston in [32].
[ { "version": "v1", "created": "Sat, 5 Jan 2008 15:40:20 GMT" }, { "version": "v2", "created": "Mon, 7 Jul 2008 12:50:53 GMT" }, { "version": "v3", "created": "Fri, 9 Jan 2009 15:03:07 GMT" } ]
2009-01-09T00:00:00
[ [ "Dinkelbach", "Jonathan", "" ], [ "Leeb", "Bernhard", "" ] ]
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801.0804
Mihai L. Ion
D. B. Ion (1 and 2) and M. L. Ion (3) ((1) National Institute for Physics and Nuclear Engineering Horia Hulubei, Bucharest, Magurele Romania, (2) TH-Division, CERN, (3) Bucharest University, Bucharest, Romania)
From Cherenkov Radiation to Generalized Super-Cherenkov Exotic Decays
14 pages, 15 figures
null
null
null
hep-ph
null
Generalized Super-Cherenkov Radiations (SCR), as well as their SCR-signatures are investigated. Two general SCR-coherence conditions are found as two natural extremes of the same spontaneous particles decays in (dielectric, nuclear or hadronic) media. The main results on the experimental test of the super-coherence conditions, obtained by using the experimental data from BNL, are presented. The interpretation of the observed anomalous Cherenkov rings as experimental evidence for the HE-component of the SCR is discussed.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 12:36:14 GMT" } ]
2008-01-08T00:00:00
[ [ "Ion", "D. B.", "", "1 and 2" ], [ "Ion", "M. L.", "" ] ]
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801.0805
Giedrius Alkauskas
Giedrius Alkauskas
One curious proof of Fermat's little theorem
3 pages. To appear in American Mathematical Monthly
Amer. Math. Monthly, 116 (4), (April 2009), 362-364.
null
null
math.NT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We give a proof of Fermat's little theorem which does not use nor arithmetic(Euclidean algorithm) neither algebra (group theory), but it rather employs the field of the formal power series Q((x)). The note is an example of a mathematical joke, though it contains a rigorous proof. (The paper will appear in print exactly as in the version v3).
[ { "version": "v1", "created": "Sat, 5 Jan 2008 13:33:23 GMT" }, { "version": "v2", "created": "Thu, 24 Apr 2008 15:07:13 GMT" }, { "version": "v3", "created": "Wed, 11 Jun 2008 11:26:05 GMT" } ]
2009-11-03T00:00:00
[ [ "Alkauskas", "Giedrius", "" ] ]
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801.0806
Jarmo Hietarinta
James Atkinson, Jarmo Hietarinta and Frank Nijhoff
Soliton solutions for Q3
11 pages
J. Phys. A: Math. Theor. 41 (2008) 142001
10.1088/1751-8113/41/14/142001
null
nlin.SI
null
We construct N-soliton solutions to the equation called Q3 in the recent Adler-Bobenko-Suris classification. An essential ingredient in the construction is the relationship of $(Q3)_{\delta=0}$ to the equation proposed by Nijhoff, Quispel and Capel in 1983 (the NQC equation). This latter equation has two extra parameters, and depending on their sign choices we get a 4-to-1 relationship from NQC to $(Q3)_{\delta=0}$. This leads to a four-term background solution, and then to a 1-soliton solution using a Backlund transformation. Using the 1SS as a guide allows us to get the N-soliton solution in terms of the tau-function of the Hirota-Miwa equation.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 13:21:19 GMT" } ]
2011-05-27T00:00:00
[ [ "Atkinson", "James", "" ], [ "Hietarinta", "Jarmo", "" ], [ "Nijhoff", "Frank", "" ] ]
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801.0807
Evgeny Korotyaev
Maria Evgenievna Korotyaeva
The parametrization of the Marchenko-Ostrovsky mapping in terms of the Dirichlet eigenvalues
null
null
null
null
math.SP math-ph math.MP
null
We consider the inverse spectral problem for periodic Jacobi matrices in terms of the vertical slits on the quasi-momentum domain plus the Dirichlet eigenvalues, i.e., the Marchenko-Ostrovsky mapping. Moreover, we show that the gradients of the Dirichlet eigenvalues and of the so-called norming constants are linear independent.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 13:32:52 GMT" } ]
2008-01-08T00:00:00
[ [ "Korotyaeva", "Maria Evgenievna", "" ] ]
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801.0808
Alexander Popov
Alexander D. Popov
Non-Abelian Vortices on Riemann Surfaces: an Integrable Case
8 pages; v2: typos fixed
Lett.Math.Phys.84:139-148,2008
10.1007/s11005-008-0243-x
null
hep-th
null
We consider U(n+1) Yang-Mills instantons on the space \Sigma\times S^2, where \Sigma is a compact Riemann surface of genus g. Using an SU(2)-equivariant dimensional reduction, we show that the U(n+1) instanton equations on \Sigma\times S^2 are equivalent to non-Abelian vortex equations on \Sigma. Solutions to these equations are given by pairs (A,\phi), where A is a gauge potential of the group U(n) and \phi is a Higgs field in the fundamental representation of the group U(n). We briefly compare this model with other non-Abelian Higgs models considered recently. Afterwards we show that for g>1, when \Sigma\times S^2 becomes a gravitational instanton, the non-Abelian vortex equations are the compatibility conditions of two linear equations (Lax pair) and therefore the standard methods of integrable systems can be applied for constructing their solutions.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 14:59:51 GMT" }, { "version": "v2", "created": "Sat, 2 Feb 2008 12:05:00 GMT" } ]
2008-11-07T00:00:00
[ [ "Popov", "Alexander D.", "" ] ]
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801.0809
Alexander Konovalov
A.B. Konovalov, A.G. Krivokhata
Symmetric subgroups in modular group algebras
5 pages, translated from original journal publication in Russian
Nauk. Visn. Uzhgorod. Univ., Ser. Mat., 9 (2004), 20-24
null
null
math.RA math.GR
null
Let V(KG) be a normalised unit group of the modular group algebra of a finite p-group G over the field K of p elements. We introduce a notion of symmetric subgroups in V(KG) as subgroups invariant under the action of the classical involution of the group algebra KG. We study properties of symmetric subgroups and construct a counterexample to the conjecture by V.Bovdi, which states that V(KG)=<G,S*>, where S* is a set of symmetric units of V(KG).
[ { "version": "v1", "created": "Sat, 5 Jan 2008 14:00:53 GMT" } ]
2008-01-08T00:00:00
[ [ "Konovalov", "A. B.", "" ], [ "Krivokhata", "A. G.", "" ] ]
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801.081
Amilcar Queiroz Mr
Luciano Barosi, Francisco A. Brito and Amilcar R. Queiroz
Noncommutative field gas driven inflation
Reference added. Version to appear in Journal of Cosmology and Astroparticle Physics - JCAP
JCAP0804:005,2008
10.1088/1475-7516/2008/04/005
null
hep-th astro-ph gr-qc hep-ph
null
We investigate early time inflationary scenarios in an Universe filled with a dilute noncommutative bosonic gas at high temperature. A noncommutative bosonic gas is a gas composed of bosonic scalar field with noncommutative field space on a commutative spacetime. Such noncommutative field theories was recently introduced as a generalization of quantum mechanics on a noncommutative spacetime. As key features of these theories are Lorentz invariance violation and CPT violation. In the present study we use a noncommutative bosonic field theory that besides the noncommutative parameter $\theta$ shows up a further parameter $\sigma$. This parameter $\sigma$ controls the range of the noncommutativity and acts as a regulator for the theory. Both parameters play a key role in the modified dispersion relations of the noncommutative bosonic field, leading to possible striking consequences for phenomenology. In this work we obtain an equation of state $p=\omega(\sigma,\theta;\beta)\rho$ for the noncommutative bosonic gas relating pressure $p$ and energy density $\rho$, in the limit of high temperature. We analyse possible behaviours for this gas parameters $\sigma$, $\theta$ and $\beta$, so that $-1\leq\omega<-1/3$, which is the region where the Universe enters an accelerated phase.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 14:35:54 GMT" }, { "version": "v2", "created": "Thu, 10 Jan 2008 02:17:29 GMT" }, { "version": "v3", "created": "Fri, 14 Mar 2008 21:17:26 GMT" } ]
2008-11-26T00:00:00
[ [ "Barosi", "Luciano", "" ], [ "Brito", "Francisco A.", "" ], [ "Queiroz", "Amilcar R.", "" ] ]
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801.0811
Matthew Colless
Matthew Colless, Heath Jones, Rob Proctor, Craig Harrison, Lachlan Campbel, Philip Lah
The 6dF Galaxy Survey: a low-redshift benchmark for bulge-dominated galaxies
4 pages, to appear in "Formation and Evolution of Galaxy Bulges", Proceedings of IAU Symposium No. 245 (Oxford, 16-20 July 2007), eds Martin Bureau, Lia Athanassoula, Beatriz Barbuy
null
null
null
astro-ph
null
The 6dF Galaxy Survey provides a very large sample of galaxies with reliable measurements of Lick line indices and velocity dispersions. This sample can be used to explore the correlations between mass and stellar population parameters such as age, metallicity and [alpha/Fe]. Preliminary results from such an analysis are presented here, and show that age and metallicity are significantly anti-correlated for both passive and star-forming galaxies. Passive galaxies have strong correlations between mass and metallicity and between age and alpha-element over-abundance, which combine to produce a downsizing relation between age and mass. For old passive galaxies, the different trends of M/L with mass and luminosity in different passbands result from the differential effect of the mass-metallicity relation on the luminosities in each passband. Future work with this sample will examine the Fundamental Plane of bulge-dominated galaxies and the influence of environment on relations between stellar population parameters and mass.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 14:50:02 GMT" } ]
2008-01-08T00:00:00
[ [ "Colless", "Matthew", "" ], [ "Jones", "Heath", "" ], [ "Proctor", "Rob", "" ], [ "Harrison", "Craig", "" ], [ "Campbel", "Lachlan", "" ], [ "Lah", "Philip", "" ] ]
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801.0812
Andreas Weber
Andreas Weber
Analysis of the physical Laplacian and the heat flow on a locally finite graph
null
null
null
null
math.SP math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the physical Laplacian and the corresponding heat flow on an infinite, locally finite graph with possibly unbounded valence.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 15:06:41 GMT" }, { "version": "v2", "created": "Thu, 31 Jan 2008 10:09:33 GMT" }, { "version": "v3", "created": "Sat, 4 Oct 2008 14:04:34 GMT" }, { "version": "v4", "created": "Fri, 1 Jan 2010 17:25:14 GMT" } ]
2010-01-01T00:00:00
[ [ "Weber", "Andreas", "" ] ]
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801.0813
Beno\^it Valiron
Peter Selinger (1), Beno\^it Valiron (2) ((1) Dalhousie University, (2) University of Ottawa)
A linear-non-linear model for a computational call-by-value lambda calculus (extended abstract)
15 pages. Preprint, to appear in the proceedings of FOSSACS'08
null
null
null
cs.LO
null
We give a categorical semantics for a call-by-value linear lambda calculus. Such a lambda calculus was used by Selinger and Valiron as the backbone of a functional programming language for quantum computation. One feature of this lambda calculus is its linear type system, which includes a duplicability operator "!" as in linear logic. Another main feature is its call-by-value reduction strategy, together with a side-effect to model probabilistic measurements. The "!" operator gives rise to a comonad, as in the linear logic models of Seely, Bierman, and Benton. The side-effects give rise to a monad, as in Moggi's computational lambda calculus. It is this combination of a monad and a comonad that makes the present paper interesting. We show that our categorical semantics is sound and complete.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 15:21:17 GMT" } ]
2008-01-08T00:00:00
[ [ "Selinger", "Peter", "" ], [ "Valiron", "Benoît", "" ] ]
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801.0814
Markus Wagner
Markus Wagner, Stefan Leupold
Information on the structure of the a1 from tau decay
null
Phys.Rev.D78:053001,2008
10.1103/PhysRevD.78.053001
null
hep-ph nucl-th
null
The decay $\tau\to \pi\pi\pi\nu$ is analysed using different methods to account for the resonance structure, which is usually ascribed to the a1. One scenario is based on the recently developed techniques to generate axial-vector resonances dynamically, whereas in a second calculation the a1 is introduced as an explicit resonance. We investigate the influence of different assumptions on the result. In the molecule scenario the spectral function is described surprisingly well by adjusting only one free parameter. This result can be systematically improved by adding higher order corrections to the iterated Weinberg-Tomozawa interaction. Treating the a1 as an explicit resonance on the other hand leads to peculiar properties.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 15:32:44 GMT" } ]
2009-01-09T00:00:00
[ [ "Wagner", "Markus", "" ], [ "Leupold", "Stefan", "" ] ]
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801.0815
Yuval Kochman
Yuval Kochman and Ram Zamir
Joint Wyner-Ziv/Dirty Paper coding by modulo-lattice modulation
Submitted to IEEE Transactions on Information Theory. Presented in part in ISIT-2006, Seattle. New version after review
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The combination of source coding with decoder side-information (Wyner-Ziv problem) and channel coding with encoder side-information (Gel'fand-Pinsker problem) can be optimally solved using the separation principle. In this work we show an alternative scheme for the quadratic-Gaussian case, which merges source and channel coding. This scheme achieves the optimal performance by a applying modulo-lattice modulation to the analog source. Thus it saves the complexity of quantization and channel decoding, and remains with the task of "shaping" only. Furthermore, for high signal-to-noise ratio (SNR), the scheme approaches the optimal performance using an SNR-independent encoder, thus it is robust to unknown SNR at the encoder.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 15:40:57 GMT" }, { "version": "v2", "created": "Mon, 21 Jan 2008 09:10:35 GMT" }, { "version": "v3", "created": "Wed, 17 Dec 2008 13:01:40 GMT" } ]
2008-12-17T00:00:00
[ [ "Kochman", "Yuval", "" ], [ "Zamir", "Ram", "" ] ]
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801.0816
Matthew Colless
Matthew Colless
The context of the Local Volume: structures and motions in the nearby universe
4 pages, to appear in "Galaxies in the Local Volume", 2008, eds B. Koribalski and H. Jerjen, Springer Astrophysics and Space Science Series (proceedings of conference held in Sydney on 8-13 July 2007)
null
10.1007/978-1-4020-6933-8_3
null
astro-ph
null
The 6dF Galaxy Survey (6dFGS) and the 2MASS Redshift Survey (2MRS) provide the most complete maps of the large-scale structures and motions in the nearby universe. These maps have been used to reconstruct the density field in the local volume, and to predict the corresponding velocity field and the dipole of the Local Group motion.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 15:42:52 GMT" } ]
2015-05-13T00:00:00
[ [ "Colless", "Matthew", "" ] ]
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801.0817
EDA Publishing Association
Y.C. Gerstenmaier, W. Kiffe, G. Wachutka
Combination of Thermal Subsystems Modelled by Rapid Circuit Transformation
Submitted on behalf of TIMA Editions (http://irevues.inist.fr/tima-editions)
Dans 13th International Worshop on THERMal INvestigations of ICs and Systems - THERMINIC 2007, Budapest : Hongrie (2007)
null
null
physics.gen-ph
null
This paper will deal with the modeling-problem of combining thermal subsystems (e.g. a semiconductor module or package with a cooling radiator) making use of reduced models. The subsystem models consist of a set of Foster-type thermal equivalent circuits, which are only behavioral models. A fast al-gorithm is presented for transforming the Foster-type circuits in Cauer-circuits which have physical behavior and therefore allow for the construction of the thermal model of the complete system. Then the set of Cauer-circuits for the complete system is transformed back into Foster-circuits to give a simple mathematical representation and applicability. The transfor-mation algorithms are derived in concise form by use of recur-sive relations. The method is exemplified by modeling and measurements on a single chip IGBT package mounted on a closed water cooled radiator. The thermal impedance of the complete system is constructed from the impedances of the sub-systems, IGBT-package and radiator, and also the impedance of the package can be inferred from the measured impedance of the complete system.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 16:27:35 GMT" } ]
2008-01-08T00:00:00
[ [ "Gerstenmaier", "Y. C.", "" ], [ "Kiffe", "W.", "" ], [ "Wachutka", "G.", "" ] ]
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801.0818
Daniel Carman
Daniel S. Carman
The Strangeness Physics Program at CLAS
12 pages, 3 figures, HADRON2007 Conference, Frascati, Italy, Oct. 8-13, 2007
null
null
null
hep-ex
null
An extensive program of strange particle production off the nucleon is currently underway with the CEBAF Large Acceptance Spectrometer (CLAS) in Hall B at Jefferson Laboratory. This talk will emphasize strangeness electroproduction in the baryon resonance region between W=1.6 and 2.4 GeV, where indications of s-channel structure are suggestive of high-mass baryon resonances coupling to kaons and hyperons in the final state. Precision measurements of cross sections and polarization observables are being carried out with highly polarized electron and real photon beams at energies up to 6 GeV. The near-term and longer-term future of this program will also be discussed.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 16:17:07 GMT" } ]
2008-01-08T00:00:00
[ [ "Carman", "Daniel S.", "" ] ]
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801.0819
Anthony Minter
Anthony H. Minter
Detection of OH absorption against PSR B1718-35
25 pages, 6 figures (1 color), 6 tables Submitted to ApJ
null
10.1086/529136
null
astro-ph
null
OH absorption against PSR B1718-35 at (l,b) =351.688,+0.671 has been discovered at 1665 and 1667 MHz using the Green Bank Telescope. The absorption appears to arise at the interface of an HII region and a molecular cloud which are likely associated with the high mass star forming region NGC 6334. Beam dilution is found to be the cause of differences in the opacity of the OH against the Galactic background continuum emission and against the pulsar. The OH cloud is approximately 3 by 1.3 pc and is located behind the HII region.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 17:01:23 GMT" } ]
2009-11-13T00:00:00
[ [ "Minter", "Anthony H.", "" ] ]
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801.082
Duiliu-Emanuel Diaconescu
Duiliu-Emanuel Diaconescu
Moduli of ADHM Sheaves and Local Donaldson-Thomas Theory
61 pages AMS Latex; v2: minor corrections, reference added; v3: some proofs corrected using the GIT construction of the moduli space due to A. Schmitt; main results unchanged; final version to appear in J. Geom. Phys
J. Geom. Phys. 62 (2012) 763
10.1016/j.geomphys.2011.12.018
null
math.AG hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The ADHM construction establishes a one-to-one correspondence between framed torsion free sheaves on the projective plane and stable framed representations of a quiver with relations in the category of complex vector spaces. This paper studies the geometry of moduli spaces of representations of the same quiver with relations in the abelian category of coherent sheaves on a smooth complex projective curve $X$. In particular it is proven that this moduli space is virtually smooth and related byrelative Beilinson spectral sequence to the curve counting construction via stable pairs of Pandharipande and Thomas. This yields a new conjectural construction for the local Donaldson-Thomas theory of curves as well as a natural higher rank generalization.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 17:26:21 GMT" }, { "version": "v2", "created": "Mon, 25 Feb 2008 13:55:16 GMT" }, { "version": "v3", "created": "Tue, 3 Jan 2012 14:11:47 GMT" } ]
2015-05-13T00:00:00
[ [ "Diaconescu", "Duiliu-Emanuel", "" ] ]
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801.0821
Mark Wilde
Mark M. Wilde and Todd A. Brun
Unified Quantum Convolutional Coding
5 pages, 1 figure, Accepted for publication in the Proceedings of the 2008 IEEE International Symposium on Information Theory (ISIT 2008)
Proceedings of the 2008 International Symposium on Information Theory, pp. 359-363, Toronto, Ontario, Canada, July 2008.
10.1109/ISIT.2008.4595008
CSI-08-01-01
quant-ph cs.IT math.IT
null
We outline a quantum convolutional coding technique for protecting a stream of classical bits and qubits. Our goal is to provide a framework for designing codes that approach the ``grandfather'' capacity of an entanglement-assisted quantum channel for sending classical and quantum information simultaneously. Our method incorporates several resources for quantum redundancy: fresh ancilla qubits, entangled bits, and gauge qubits. The use of these diverse resources gives our technique the benefits of both active and passive quantum error correction. We can encode a classical-quantum bit stream with periodic quantum gates because our codes possess a convolutional structure. We end with an example of a ``grandfather'' quantum convolutional code that protects one qubit and one classical bit per frame by encoding them with one fresh ancilla qubit, one entangled bit, and one gauge qubit per frame. We explicitly provide the encoding and decoding circuits for this example.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 16:22:33 GMT" }, { "version": "v2", "created": "Tue, 29 Apr 2008 19:50:13 GMT" } ]
2008-10-20T00:00:00
[ [ "Wilde", "Mark M.", "" ], [ "Brun", "Todd A.", "" ] ]
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801.0822
Anatoliy U. Klimyk
Anatoliy U. Klimyk and Jiri Patera
E-Orbit Functions
Published in SIGMA (Symmetry, Integrability and Geometry: Methods and Applications) at http://www.emis.de/journals/SIGMA/
SIGMA 4 (2008), 002, 57 pages
10.3842/SIGMA.2008.002
null
math-ph math.CA math.MP
null
We review and further develop the theory of $E$-orbit functions. They are functions on the Euclidean space $E_n$ obtained from the multivariate exponential function by symmetrization by means of an even part $W_{e}$ of a Weyl group $W$, corresponding to a Coxeter-Dynkin diagram. Properties of such functions are described. They are closely related to symmetric and antisymmetric orbit functions which are received from exponential functions by symmetrization and antisymmetrization procedure by means of a Weyl group $W$. The $E$-orbit functions, determined by integral parameters, are invariant with respect to even part $W^{\rm aff}_{e}$ of the affine Weyl group corresponding to $W$. The $E$-orbit functions determine a symmetrized Fourier transform, where these functions serve as a kernel of the transform. They also determine a transform on a finite set of points of the fundamental domain $F^{e}$ of the group $W^{\rm aff}_{e}$ (the discrete $E$-orbit function transform).
[ { "version": "v1", "created": "Sat, 5 Jan 2008 18:53:48 GMT" } ]
2008-04-25T00:00:00
[ [ "Klimyk", "Anatoliy U.", "" ], [ "Patera", "Jiri", "" ] ]
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801.0823
Vladimir Sergeichuk
Vladimir V. Sergeichuk
Classification problems for system of forms and linear mappings
46 pages
Math. USSR-Izv. 31 (no. 3) (1988) 481-501
10.1070/IM1988v031n03ABEH001086
null
math.RT
null
We devise a method that reduces the problem of classifying systems of forms and linear mappings to the problem of classifying systems of linear mappings. Canonical matrices of (i) bilinear or sesquilinear forms, (ii) pairs of symmetric, skew-symmetric, or Hermitian forms, (iii) isometric or selfadjoint operators on a space with nonsingular symmetric, or skew-symmetric, or Hermitian form are obtained over any field of characteristic not 2 up to classification of Hermitian forms over its finite extensions.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 20:25:15 GMT" } ]
2008-01-08T00:00:00
[ [ "Sergeichuk", "Vladimir V.", "" ] ]
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801.0824
EDA Publishing Association
V. Kosel, R. Sleik, M. Glavanovics
Transient Non-linear Thermal FEM Simulation of Smart Power Switches and Verification by Measurements
Submitted on behalf of TIMA Editions (http://irevues.inist.fr/tima-editions)
Dans 13th International Worshop on THERMal INvestigations of ICs and Systems - THERMINIC 2007, Budapest : Hongrie (2007)
null
null
physics.gen-ph
null
Thermal FEM (Finite Element Method) simulations can be used to predict the thermal behavior of power semiconductors in application. Most power semiconductors are made of silicon. Silicon thermal material properties are significantly temperature dependent. In this paper, validity of a common non-linear silicon material model is verified by transient non-linear thermal FEM simulations of Smart Power Switches and measurements. For verification, over-temperature protection behavior of Smart Power Switches is employed. This protection turns off the switch at a pre-defined temperature which is used as a temperature reference in the investigation. Power dissipation generated during a thermal overload event of two Smart Power devices is measured and used as an input stimulus to transient thermal FEM simulations. The duration time of the event together with the temperature reference is confronted with simulation results and thus the validity of the silicon model is proved. In addition, the impact of non-linear thermal properties of silicon on the thermal impedance of power semiconductors is shown.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 16:28:27 GMT" } ]
2008-01-08T00:00:00
[ [ "Kosel", "V.", "" ], [ "Sleik", "R.", "" ], [ "Glavanovics", "M.", "" ] ]
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801.0825
Weihua Li
Don Hadwin, Weihua Li
A Modified Version of Free Orbit-Dimension of von Neumann Algebras
null
null
null
null
math.OA
null
Based on the notion of free orbit-dimension introduced by D. Hadwin and J. Shen [4], we introduce a new invariant on finite von Neumann algebras that do not necessarily act on separable Hilbert space. We show that this invariant is independent on the generating set, and we extend some results in [4] to von Neumann algebras that are not finitely generated.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 19:40:32 GMT" } ]
2008-01-08T00:00:00
[ [ "Hadwin", "Don", "" ], [ "Li", "Weihua", "" ] ]
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801.0826
Jared Wunsch
Andras Vasy and Jared Wunsch
Semiclassical second microlocal propagation of regularity and integrable systems
Updated with an erratum, detailing an error in the proof of Corollary 6.2 and substituting a weaker result. The erratum now precedes the bulk of the manuscript in the pdf file
J. Anal. Math. 108 (2009), 119--157
null
null
math.AP math.SP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We develop a second-microlocal calculus of pseudodifferential operators in the semiclassical setting. These operators test for Lagrangian regularity of semiclassical families of distributions on a manifold $X$ with respect to a Lagrangian submanifold of $T^*X.$ The construction of the calculus, closely analogous to one performed by Bony in the setting of homogeneous Lagrangians, proceeds via the consideration of a model case, that of the zero section of $T^*\mathbb{R}^n,$ and conjugation by appropriate Fourier integral operators. We prove a propagation theorem for the associated wavefront set analogous to H\"ormander's theorem for operators of real principal type. As an application, we consider the propagation of Lagrangian regularity on invariant tori for quasimodes (e.g. eigenfunctions) of an operator with completely integrable classical hamiltonian. We prove a secondary propagation result for second wavefront set which implies that even in the (extreme) case of Lagrangian tori with all frequencies rational, provided a nondegeneracy assumption holds, Lagrangian regularity either spreads to fill out a whole torus or holds nowhere locally on it.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 01:50:52 GMT" }, { "version": "v2", "created": "Fri, 25 Mar 2011 20:18:35 GMT" } ]
2011-03-29T00:00:00
[ [ "Vasy", "Andras", "" ], [ "Wunsch", "Jared", "" ] ]
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801.0827
Ichiro Oda
Masahiro Maeno and Ichiro Oda
Classical Solutions of Ghost Condensation Models
9 pages, no figures
Mod.Phys.Lett.B22:3025-3034,2009
10.1142/S0217984908017655
null
hep-th
null
Motivated by ideas obtained from both ghost condensation and gravitational Higgs mechanism, we attempt to find classical solutions in the unitary gauge in general ghost condensation models. It is shown that depending on the form of scalar fields in an action, there are three kinds of exact solutions, which are (anti-) de Sitter space-time, polynomially expanding universes and flat Minkowski space-time. We briefly comment on gravitational Higgs mechanism in these models where we have massive gravitons of 5 degrees of freedom and 1 unitary scalar field (Nambu-Goldstone boson) after spontaneous symmetry breakdown of general coordinate reparametrization invariance. The models at hand are free from the problem associated with the non-unitary propagating mode.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 20:21:36 GMT" } ]
2009-02-10T00:00:00
[ [ "Maeno", "Masahiro", "" ], [ "Oda", "Ichiro", "" ] ]
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801.0828
Gabriele Carcassi
Gabriele Carcassi (Brookhaven National Laboratory)
Quantum mechanics as a consequence of discrete interactions
8 pages, 4 figures, submitted to the American Journal of Physics
null
null
null
quant-ph
null
Quantum mechanics is usually presented starting from a series of postulates about the mathematical framework. In this work we show that those same postulates can be derived by assuming that measurements are discrete interactions: that is, that we measure at specific moments in time (as opposed to a continuous measurement that spans a long time interval) and that the system is in general affected by our measurement. We believe that this way of presenting quantum mechanics would make it easier to understand by laying out a more cohesive view of the theory and making it resonate more with our physics intuition.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 20:36:35 GMT" } ]
2008-01-08T00:00:00
[ [ "Carcassi", "Gabriele", "", "Brookhaven National Laboratory" ] ]
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801.0829
Satyaki Dutta
Satyaki Dutta
Rigidity of Conformally Compact Manifolds with the Round Sphere as the Conformal Infinity
23 pages
null
null
null
math.DG
null
In this paper we prove that under a lower bound on the Ricci curvature and an asymptotic assumption on the scalar curvature, a complete conformally compact manifold $(M^{n+1},g)$, with a pole $p$ and with the conformal infinity in the conformal class of the round sphere, has to be the hyperbolic space.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 23:59:07 GMT" } ]
2008-01-08T00:00:00
[ [ "Dutta", "Satyaki", "" ] ]
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801.083
Atilim Gunes Baydin
Atilim Gunes Baydin
Evolution of central pattern generators for the control of a five-link bipedal walking mechanism
11 pages, 9 figures; substantial revision of content, organization, and quantitative results
Paladyn. Journal of Behavioral Robotics 3(1), 45-53 (2012)
10.2478/s13230-012-0019-y
null
cs.NE cs.RO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Central pattern generators (CPGs), with a basis is neurophysiological studies, are a type of neural network for the generation of rhythmic motion. While CPGs are being increasingly used in robot control, most applications are hand-tuned for a specific task and it is acknowledged in the field that generic methods and design principles for creating individual networks for a given task are lacking. This study presents an approach where the connectivity and oscillatory parameters of a CPG network are determined by an evolutionary algorithm with fitness evaluations in a realistic simulation with accurate physics. We apply this technique to a five-link planar walking mechanism to demonstrate its feasibility and performance. In addition, to see whether results from simulation can be acceptably transferred to real robot hardware, the best evolved CPG network is also tested on a real mechanism. Our results also confirm that the biologically inspired CPG model is well suited for legged locomotion, since a diverse manifestation of networks have been observed to succeed in fitness simulations during evolution.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 00:20:25 GMT" }, { "version": "v2", "created": "Wed, 20 Feb 2008 19:28:42 GMT" }, { "version": "v3", "created": "Thu, 6 Mar 2008 17:37:29 GMT" }, { "version": "v4", "created": "Sat, 21 Nov 2009 00:04:19 GMT" }, { "version": "v5", "created": "Sat, 30 Jul 2011 02:01:05 GMT" }, { "version": "v6", "created": "Mon, 10 Oct 2011 17:37:47 GMT" }, { "version": "v7", "created": "Tue, 11 Oct 2011 02:42:44 GMT" }, { "version": "v8", "created": "Wed, 12 Oct 2011 00:42:10 GMT" }, { "version": "v9", "created": "Thu, 29 Mar 2012 02:02:45 GMT" } ]
2015-03-13T00:00:00
[ [ "Baydin", "Atilim Gunes", "" ] ]
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801.0831
Sixia Yu
Dan Hu, Weidong Tang, Meisheng Zhao, Qing Chen, Sixia Yu, and C.H. Oh
Graphical Nonbinary Quantum Error-Correcting Codes
12 pages, 5 figures (pdf)
null
10.1103/PhysRevA.78.012306
null
quant-ph
null
In this paper, based on the nonbinary graph state, we present a systematic way of constructing good non-binary quantum codes, both additive and nonadditive, for systems with integer dimensions. With the help of computer search, which results in many interesting codes including some nonadditive codes meeting the Singleton bounds, we are able to construct explicitly four families of optimal codes, namely, $[[6,2,3]]_p$, $[[7,3,3]]_p$, $[[8,2,4]]_p$ and $[[8,4,3]]_p$ for any odd dimension $p$ and a family of nonadditive code $((5,p,3))_p$ for arbitrary $p>3$. In the case of composite numbers as dimensions, we also construct a family of stabilizer codes $((6,2\cdot p^2,3))_{2p}$ for odd $p$, whose coding subspace is {\em not} of a dimension that is a power of the dimension of the physical subsystem.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 00:55:20 GMT" } ]
2009-11-13T00:00:00
[ [ "Hu", "Dan", "" ], [ "Tang", "Weidong", "" ], [ "Zhao", "Meisheng", "" ], [ "Chen", "Qing", "" ], [ "Yu", "Sixia", "" ], [ "Oh", "C. H.", "" ] ]
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801.0832
Nicola Bennert
Nicola Bennert, Gabriela Canalizo, Bruno Jungwiert, Alan Stockton, Francois Schweizer, Chien Y. Peng, Mark Lacy
Evidence for Merger Remnants in Early-Type Host Galaxies of Low-Redshift QSOs
22 pages, 4 figures. Accepted for publication in the Astrophysical Journal
null
10.1086/529068
null
astro-ph
null
We present results from a pilot HST ACS deep imaging study in broad-band V of five low-redshift QSO host galaxies classified in the literature as ellipticals. The aim of our study is to determine whether these early-type hosts formed at high redshift and have since evolved passively, or whether they have undergone relatively recent mergers that may be related to the triggering of the nuclear activity. We perform two-dimensional modeling of the light distributions to analyze the host galaxies' morphology. We find that, while each host galaxy is reasonably well fitted by a de Vaucouleurs profile, the majority of them (4/5) reveal significant fine structure such as shells and tidal tails. These structures contribute between ~5% and 10% to the total V-band luminosity of each host galaxy within a region of r ~ 3 r_eff and are indicative of merger events that occurred between a few hundred Myr and a Gyr ago. These timescales are comparable to starburst ages in the QSO hosts previously inferred from Keck spectroscopy. Our results thus support a consistent scenario in which most of the QSO host galaxies suffered mergers with accompanying starbursts that likely also triggered the QSO activity in some way, but we are also left with considerable uncertainty on physical mechanisms that might have delayed this triggering for several hundred Myr after the merger.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 01:20:12 GMT" } ]
2009-11-13T00:00:00
[ [ "Bennert", "Nicola", "" ], [ "Canalizo", "Gabriela", "" ], [ "Jungwiert", "Bruno", "" ], [ "Stockton", "Alan", "" ], [ "Schweizer", "Francois", "" ], [ "Peng", "Chien Y.", "" ], [ "Lacy", "Mark", "" ] ]
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801.0833
Eugen Ionascu Dr
Timothy Howard, Eugen J. Ionascu, and David Woolbright
Introduction to the Prisoners Versus Guards Game
15 pages, 1 figure
null
null
null
math.CO
null
We introduce a two-player game in which one and his/her opponent attempt to pack as many ``prisoners'' as possible on the squares of an n-by-n checkerboard; each prisoner has to be ``protected'' by at least as many guards as the number of the other prisoners adjacent. Initially, the board is covered entirely with guards. The players take turns adjusting the board configuration using one of the following rules in each turn: I. Replace one guard with a prisoner of the player's color. II. Replace one prisoner of either color with a guard and replace two other guards with prisoners of the player's color. We analyze winning strategies for small n (n<5) and the maximum number of prisoners in general. We show that this maximum is less than (7n^2+4n)/11 and conjecture it is more likely 3n^2/5+O(n).
[ { "version": "v1", "created": "Sun, 6 Jan 2008 01:24:47 GMT" } ]
2008-01-08T00:00:00
[ [ "Howard", "Timothy", "" ], [ "Ionascu", "Eugen J.", "" ], [ "Woolbright", "David", "" ] ]
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801.0834
Lorenzo Iorio
Lorenzo Iorio
Determination of tidal distortion in the eclipsing binary system V621 Cen by means of deviations from the third Kepler law
Latex, 6 pages, no figures, 1 table. To appear in New Astronomy
NewAstron.13:473-475,2008
10.1016/j.newast.2008.01.004
null
gr-qc astro-ph
null
In this paper we determine the tidal distortion parameter k_m of the secondary partner (mass loser) of the semi-detached eclipsing binary system V621 Cen by comparing the phenomenologically determined orbital period P_b=3.683549(11) d to the Keplerian one P^Kep computed with the values of the relevant system's parameters determined independently of the third Kepler law itself. Our result is k_m = -1.5 +/- 0.6. Using the periastron precession, as traditionally done with other eclipsing binaries in eccentric orbits, would have not been possible because of the circularity of the V621 Cen path.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 01:59:15 GMT" } ]
2008-11-26T00:00:00
[ [ "Iorio", "Lorenzo", "" ] ]
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801.0835
Piotr Szymczak
P. Szymczak and B. Cichocki
Diagrammatic approach to response problems in composite systems
to be published in J. Stat. Mech
null
10.1088/1742-5468/2008/01/P01025
null
cond-mat.stat-mech cond-mat.soft
null
The bulk macroscopic response of a system of particles or inclusions with field-induced forces is studied. The susceptibilities and transport coefficients in such a system are expressed as averages of a multiple scattering expansion. A special diagrammatic method is developed to analyze the structure of the expansion. The concept of irreducibility is discussed in detail and shown to be crucial in obtaining macroscopic equations characterizing the system response with coefficients depending solely on local properties of the medium. Due to the representation of particles by lines in diagrams, irreducibility is given a particularly simple topological interpretation in the diagrammatic language. The method is illustrated by a discussion of response problems in colloidal suspensions in presence of hydrodynamic interactions.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 02:37:51 GMT" } ]
2009-11-13T00:00:00
[ [ "Szymczak", "P.", "" ], [ "Cichocki", "B.", "" ] ]
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801.0836
Andrej Gendiar
Andrej Gendiar, Roman Krcmar, Kouiji Ueda and Tomotoshi Nishino
Phase transition of clock models on hyperbolic lattice studied by corner transfer matrix renormalization group method
REVTeX style, 4 pages, 6 figures, submitted to Phys. Rev. E
Phys. Rev. E 77 (2008) 041123
10.1103/PhysRevE.77.041123
null
cond-mat.stat-mech
null
Two-dimensional ferromagnetic N-state clock models are studied on a hyperbolic lattice represented by tessellation of pentagons. The lattice lies on the hyperbolic plane with a constant negative scalar curvature. We observe the spontaneous magnetization, the internal energy, and the specific heat at the center of sufficiently large systems, where the fixed boundary conditions are imposed, for the cases N>=3 up to N=30. The model with N=3, which is equivalent to the 3-state Potts model on the hyperbolic lattice, exhibits the first order phase transition. A mean-field like phase transition of the second order is observed for the cases N>=4. When N>=5 we observe the Schottky type specific heat below the transition temperature, where its peak hight at low temperatures scales as N^{-2}. From these facts we conclude that the phase transition of classical XY-model deep inside the hyperbolic lattices is not of the Berezinskii-Kosterlitz-Thouless type.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 16:28:08 GMT" }, { "version": "v2", "created": "Fri, 7 Mar 2008 12:08:16 GMT" }, { "version": "v3", "created": "Mon, 31 Mar 2008 11:57:37 GMT" } ]
2009-11-13T00:00:00
[ [ "Gendiar", "Andrej", "" ], [ "Krcmar", "Roman", "" ], [ "Ueda", "Kouiji", "" ], [ "Nishino", "Tomotoshi", "" ] ]
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801.0837
Vu Le Anh
Le Anh Vu and Kar Ping Shum
Classification of 5-dimensional MD-algebras having commutive derived ideals
27 pages, no figures
null
null
null
math.RA
null
In this paper, we study a subclass of the class of MD-algebras, i.e., the class of solvable real Lie algebras such that the K-orbits of its corresponding connected and simply connected Lie groups are either orbits of dimension zero or orbits with maximal dimensions. Our main result is to classify, up to isomorphism, all the 5-dimensional MD-algebras having commutative derived ideals.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 03:01:34 GMT" }, { "version": "v2", "created": "Mon, 18 Feb 2008 17:04:49 GMT" } ]
2008-02-18T00:00:00
[ [ "Vu", "Le Anh", "" ], [ "Shum", "Kar Ping", "" ] ]
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801.0838
Huan Yang
Huan Yang, Ying Jia, Lei Shan, Chenggang Zhuang, X. X. Xi, Qi Li, Zikui Liu, Qingrong Feng, and Hai-Hu Wen
Scaling of Hall Resistivity in the Mixed State of MgB2 Films
null
null
null
null
cond-mat.supr-con
null
The longitudinal resistivity (rho_{xx}) and transverse resistivity (rho_{xy}) of MgB2 thin films in the mixed state were studied in detail. We found that the temperature dependencies of rho_{xx} and \rho_{xy} at a fixed magnetic field (H) satisfy the scaling law of $\rho_{xy}=A\rho_{xx}^\beta$, where the exponent beta varies around 2.0 for different fields. In the low field region (below 1T), beta maintains a constant value of 2.0 due to the weak pinning strength of the vortices, mainly from the superfluid of the pi band. When H>1T, beta drops abruptly to its lowest value at about 2T because of the proliferation of quasiparticles from the pi-band and, hence, the motion of the vortices from the superfluid of the sigma-band dominates the dissipation. As the field is increased further, the vortex pinning strength is weakened and beta increases monotonically towards 2.0 at a high field. All the results presented here are in good agreement with the expectation of the vortex physics of a multi-band superconductor.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 04:19:18 GMT" } ]
2008-01-08T00:00:00
[ [ "Yang", "Huan", "" ], [ "Jia", "Ying", "" ], [ "Shan", "Lei", "" ], [ "Zhuang", "Chenggang", "" ], [ "Xi", "X. X.", "" ], [ "Li", "Qi", "" ], [ "Liu", "Zikui", "" ], [ "Feng", "Qingrong", "" ], [ "Wen", "Hai-Hu", "" ] ]
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801.0839
Yi-Xin Chen
Yi-Xin Chen, Yong-Qiang Wang
First-order attractor flow equations for supersymmetric black rings in N=2, D=5 supergravity
18 pages, no figure, the references are added
JHEP 0802:052,2008
10.1088/1126-6708/2008/02/052
null
hep-th
null
In this paper we investigate the attractor mechanism in the five dimensional low energy supergravity theory corresponding to M-theory compactified on a Calabi-Yau threefold $CY_3$. Using very special geometry, we derive the general first-order attractor flow equations for BPS and non-BPS solutions in five-dimensional Gibbons-Hawking spaces. Especially, considering the supersymmetric solution, we obtain the first-order flow equations for supersymmetric (multi)black rings. We also solve the flow equations and discuss some properties of the solutions of flow equations.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 05:55:36 GMT" }, { "version": "v2", "created": "Mon, 18 Feb 2008 02:04:55 GMT" } ]
2014-11-18T00:00:00
[ [ "Chen", "Yi-Xin", "" ], [ "Wang", "Yong-Qiang", "" ] ]
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801.084
Anton Poluektov
A. Bondar and A. Poluektov
The use of quantum-correlated D^0 decays for phi3 measurement
Replaced by journal version
Eur.Phys.J.C55:51-56,2008
10.1140/epjc/s10052-008-0600-z
null
hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report the results of the Monte-Carlo study of the method to determine the CKM angle phi3 using Dalitz plot analysis of D0 decay from B->DK process. Our main goal is to find the optimal strategy for a model-independent phi3 extraction. We find that the analysis using decays of CP-tagged D mesons only cannot provide a completely model-independent measurement in the case of limited data sample. The procedure involving binned analysis of B->DK and psi(3770)->(K0 pi+ pi-)_D (K0 pi+ pi-)_D decays is proposed, that allows to reach the phi3 precision comparable to unbinned model-dependent fit.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 06:37:02 GMT" }, { "version": "v2", "created": "Wed, 8 Oct 2008 16:37:43 GMT" } ]
2010-10-27T00:00:00
[ [ "Bondar", "A.", "" ], [ "Poluektov", "A.", "" ] ]
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801.0841
Saikat Guha
Saikat Guha, Jeffrey H. Shapiro, Baris I. Erkmen
Capacity of the Bosonic Wiretap Channel and the Entropy Photon-Number Inequality
5 pages, 1 figure, submitted to ISIT 2008
null
null
null
quant-ph cs.IT math.IT
null
Determining the ultimate classical information carrying capacity of electromagnetic waves requires quantum-mechanical analysis to properly account for the bosonic nature of these waves. Recent work has established capacity theorems for bosonic single-user and broadcast channels, under the presumption of two minimum output entropy conjectures. Despite considerable accumulated evidence that supports the validity of these conjectures, they have yet to be proven. In this paper, it is shown that the second conjecture suffices to prove the classical capacity of the bosonic wiretap channel, which in turn would also prove the quantum capacity of the lossy bosonic channel. The preceding minimum output entropy conjectures are then shown to be simple consequences of an Entropy Photon-Number Inequality (EPnI), which is a conjectured quantum-mechanical analog of the Entropy Power Inequality (EPI) form classical information theory.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 06:49:55 GMT" } ]
2008-02-10T00:00:00
[ [ "Guha", "Saikat", "" ], [ "Shapiro", "Jeffrey H.", "" ], [ "Erkmen", "Baris I.", "" ] ]
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801.0842
Sergey Tsarev P.
V.M. Loginov
Time dependence of moments of an exactly solvable Verhulst model under random perturbations
LaTeX, 6 pages
null
null
null
nlin.CD nlin.SI
null
Explicit expressions for one point moments corresponding to stochastic Verhulst model driven by Markovian coloured dichotomous noise are presented. It is shown that the moments are the given functions of a decreasing exponent. The asymptotic behavior (for large time) of the moments is described by a single decreasing exponent.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 07:32:23 GMT" } ]
2008-01-08T00:00:00
[ [ "Loginov", "V. M.", "" ] ]
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801.0843
De-Qi Zhang
De-Qi Zhang
Dynamics of Automorphisms of Compact Complex Manifolds
in : Proceedings of International Congress of CHINESE Mathematicians 2007 -- Section: Algebraic Geometry
Proceedings of The Fourth International Congress of Chinese Mathematicians (ICCM2007), Section: Algebraic Geometry, 17 - 22 December 2007, HangZhou, China, ICCM 2007, Vol II, pp. 678 - 689
null
null
math.DS math.AG
null
We give an algebro-geometric approach towards the dynamics of automorphisms/endomorphisms of projective varieties or compact K\"ahler manifolds, try to determine the building blocks of automorphisms /endomorphisms, and show the relation between the dynamics of automorphisms/endomorphisms and the geometry of the underlying manifolds.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 08:10:11 GMT" } ]
2018-06-21T00:00:00
[ [ "Zhang", "De-Qi", "" ] ]
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801.0844
E. Ahmed
E. Ahmed and A.S.Hegazi
Survival May Not be for the Fittest (Lessons from some TV games)
none
null
null
null
q-bio.PE
null
In this paper we argue that biological fitness is a multi-objective concept hence the statement "fittest" is inappropriate. The following statement is proposed "Survival is mostly for those with non-dominated fitness". Also we use some TV games to show that under the following conditions: i) There are no dominant players. ii) At each time step successful players may eliminate some of their less successful competitors, Then the ultimate winner may not be the fittest (but close).
[ { "version": "v1", "created": "Sun, 6 Jan 2008 08:05:51 GMT" }, { "version": "v2", "created": "Thu, 10 Jan 2008 08:23:31 GMT" } ]
2008-01-10T00:00:00
[ [ "Ahmed", "E.", "" ], [ "Hegazi", "A. S.", "" ] ]
[ 0.0869596004, 0.1056104526, 0.0811894909, 0.0069248574, 0.1144113243, 0.0421101265, -0.0243481044, 0.0415564291, 0.0125091849, 0.0885332674, 0.032231003, -0.1154021472, -0.1117885485, 0.0103891073, 0.0883584172, 0.0313858874, 0.0945947915, -0.0710480884, -0.0478219502, 0.0576136485, 0.0456363037, 0.0336006768, 0.0207053609, -0.0553988591, 0.0158095118, -0.0526886582, 0.0733211637, 0.1552683413, 0.0548743047, -0.038671378, 0.1010060236, -0.016130073, -0.0972175673, -0.0260820519, -0.0813060626, 0.1479245722, 0.0550782979, 0.0248289481, 0.0213027708, -0.0611398257, 0.0713977963, -0.0196271073, -0.1332370341, 0.0825883076, 0.0004835743, -0.0174560323, 0.087833859, -0.0617809482, -0.0803735182, -0.0178494491, -0.1397648305, 0.0984415337, 0.0185925681, -0.0376222655, -0.0187091362, -0.0606152713, -0.0746034086, -0.023881834, -0.082938008, -0.0761770755, -0.0206907894, 0.0357280411, 0.0475305319, 0.070640102, -0.0077590463, 0.0193502605, -0.044412341, 0.0228618663, -0.0413524359, -0.0308321901, -0.0222061705, -0.1187243313, -0.0135000115, 0.0684253126, -0.0044040782, -0.0283114109, -0.0439460725, 0.008494881, 0.0469768345, -0.0146729751, 0.0192919765, 0.0315607414, 0.0938371047, 0.0323184319, -0.0246103834, 0.0172520392, -0.0916805938, -0.0332218297, -0.1118468344, -0.0658025369, 0.0298996475, -0.0456945896, -0.1089326367, -0.0295790862, 0.0524555221, -0.0123926168, 0.1083498001, -0.0263734721, -0.0553405769, -0.0444414839, -0.0542040393, -0.0706983879, -0.022395594, -0.0251349378, 0.0575553663, -0.033658959, -0.0258926284, 0.033775527, 0.0047501391, -0.0243189633, -0.1249607131, -0.0834042802, -0.0084730238, 0.0686001703, -0.0514064133, -0.0006251861, -0.0136602921, -0.0822968856, 0.0869013146, -0.0025080296, 0.1114388406, 0.0190588403, -0.0373017043, -0.0112852231, -0.0324349999, 0.0077226185, 0.1027545407, -0.0308321901, -0.0547577366, -0.0978004113, 0.1169175357, -0.0123634757, -0.0155326631, 0.0468602665, 0.0145564079, 0.0104765333, -0.0974507034, 0.0539709032, -0.0565936826, -0.01235619, -0.0308321901, -0.0646368638, -0.0095585622, 0.0319104418, 0.0168294795, 0.0241149701, 0.0293459501, 0.0004125408, 0.0495704673, 0.0661522448, 0.1358015239, -0.044558052, -0.0590416044, 0.1202979982, 0.0302493516, -0.1191906035, -0.0136384359, 0.0396330617, -0.0236632694, -0.0804318041, 0.0011465539, -0.0320561528, -0.0588084683, 0.0352326259, 0.0172666088, -0.0109573761, -0.0519309677, -0.0030216568, -0.0741371363, 0.1049110442, 0.0904566348, -0.0369520001, -0.1154604331, -0.0111832265, -0.0732628778, 0.0025025655, -0.0434215181, -0.1007146016, -0.0567685328, -0.1024631187, -0.0619558021, 0.065103136, -0.0235904139, 0.0179805867, 0.0108480938, -0.0143232718, -0.02144848, 0.0055843275, 0.0066552944, -0.0543206073, -0.0489584878, -0.0897572264, 0.0195833948, -0.0776341707, -0.0259654839, -0.0310944691, 0.0764102116, 0.0362817384, 0.0451117493, 0.118840903, -0.0160135049, -0.0474139638, 0.0520766787, -0.035349194, -0.0421101265, -0.0521349609, -0.0584004819, 0.1212305427, -0.0321727209, 0.0488127768, 0.0683087483, 0.0411192998, 0.0712812245, -0.1120216846, 0.0849779472, -0.035320051, -0.0660939589, 0.1161015555, -0.0388170853, 0.1735695004, -0.0189568438, 0.0482007973, 0.0278305691, 0.0250329413, -0.1341695637, -0.0567976758, 0.0504447296, -0.0076934765, 0.016071789, -0.0630049109, -0.0047902092, 0.0306864809, -0.0490459129, -0.0411484428, -0.0082253171, -0.0783918649, -0.0518143997, 0.0392250754, -0.095818758, 0.0316481665, -0.0057300371, 0.0164214931, -0.0194813982, 0.0471516885, 0.0182137229, -0.0128078898, -0.0870761648, -0.1269423664, -0.0721554831, -0.0362525955, 0.1027545407, -0.0291273855, 0.0877172947, -0.0645785779, 0.0664436594, 0.0124509009 ]
801.0845
Satoshi Ohya
C. S. Lim, Tomoaki Nagasawa, Satoshi Ohya, Kazuki Sakamoto, Makoto Sakamoto
Gauge-Fixing and Residual Symmetries in Gauge/Gravity Theories with Extra Dimensions
REVTeX4, 17 pages, 1 figure
Phys.Rev.D77:065009,2008
10.1103/PhysRevD.77.065009
KOBE-TH-07-09
hep-th
null
We study compactified pure gauge/gravitational theories with gauge-fixing terms and show that these theories possess quantum mechanical SUSY-like symmetries between unphysical degrees of freedom. These residual symmetries are global symmetries and generated by quantum mechanical N=2 supercharges. Also, we establish new one-parameter family of gauge choices for higher-dimensional gravity, and calculate as a check of its validity one graviton exchange amplitude in the lowest tree-level approximation. We confirm that the result is indeed $\xi$-independent and the cancellation of the $\xi$-dependence is ensured by the residual symmetries. We also give a simple interpretation of the vDVZ-discontinuity, which arises in the lowest tree-level approximation, from the supersymmetric point of view.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 08:14:10 GMT" } ]
2008-11-26T00:00:00
[ [ "Lim", "C. S.", "" ], [ "Nagasawa", "Tomoaki", "" ], [ "Ohya", "Satoshi", "" ], [ "Sakamoto", "Kazuki", "" ], [ "Sakamoto", "Makoto", "" ] ]
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801.0846
Roman Konoplya
R. A. Konoplya
Superradiant instability for black holes immersed in a magnetic field
10 pages, Latex, 5 figures, corrected version
Phys.Lett.B666:283-287,2008; Phys.Lett.B670:459,2009
10.1016/j.physletb.2008.07.079 10.1016/j.physletb.2008.11.059
null
hep-th astro-ph gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the bound states of the massive scalar field around a rotating black hole immersed in the asymptotically uniform magnetic field. In the regime of slow black hole rotation, the Klein-Gordon equation allows separation of variables. We show that the growth rate of the instability can be amplified a few times by the magnetic field. The effect occurs because the magnetic field adds the "effective mass" term $B |m|$ to the scalar field potential for a Kerr black hole. In addition, and as a by-product, we discuss the behavior of the quasinormal modes for the magnetized rotating black holes.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 06:49:20 GMT" }, { "version": "v2", "created": "Fri, 16 May 2008 14:27:35 GMT" }, { "version": "v3", "created": "Fri, 18 Jul 2008 16:26:03 GMT" }, { "version": "v4", "created": "Sat, 22 Nov 2008 07:05:12 GMT" } ]
2009-01-16T00:00:00
[ [ "Konoplya", "R. A.", "" ] ]
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801.0847
E. Ahmed
E. Ahmed and A.H. Hashish
On Modelling The Immune System as a Complex system
5 pages
null
null
null
q-bio.PE
null
We argue that immune system is an adaptive complex system. It is shown that it has emergent properties. Its network structure is of the small world network type. The network is of the threshold type, which helps in avoiding autoimmunity. It has the property that every antigen (e.g.virus or bacteria) is typically attacked by more than one effector. This stabilizes the equilibrium state. Modelling complex systems is discussed. Cellular automata (CA) type models are successful but there are much less analytic results about CA than about other less successful models e.g. partial differential equations (PDE). A compromise is proposed
[ { "version": "v1", "created": "Sun, 6 Jan 2008 08:24:35 GMT" } ]
2008-01-08T00:00:00
[ [ "Ahmed", "E.", "" ], [ "Hashish", "A. H.", "" ] ]
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801.0848
Nathalie Villa
Romain Boulet (IMT), Bertrand Jouve (IMT), Fabrice Rossi (INRIA Rocquencourt / INRIA Sophia Antipolis), Nathalie Villa (IMT)
Batch kernel SOM and related Laplacian methods for social network analysis
null
Neurocomputing / EEG Neurocomputing (2008) A para\^itre
null
null
stat.AP math.ST stat.ME stat.ML stat.TH
null
Large graphs are natural mathematical models for describing the structure of the data in a wide variety of fields, such as web mining, social networks, information retrieval, biological networks, etc. For all these applications, automatic tools are required to get a synthetic view of the graph and to reach a good understanding of the underlying problem. In particular, discovering groups of tightly connected vertices and understanding the relations between those groups is very important in practice. This paper shows how a kernel version of the batch Self Organizing Map can be used to achieve these goals via kernels derived from the Laplacian matrix of the graph, especially when it is used in conjunction with more classical methods based on the spectral analysis of the graph. The proposed method is used to explore the structure of a medieval social network modeled through a weighted graph that has been directly built from a large corpus of agrarian contracts.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 08:28:15 GMT" } ]
2008-01-08T00:00:00
[ [ "Boulet", "Romain", "", "IMT" ], [ "Jouve", "Bertrand", "", "IMT" ], [ "Rossi", "Fabrice", "", "INRIA\n Rocquencourt / INRIA Sophia Antipolis" ], [ "Villa", "Nathalie", "", "IMT" ] ]
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801.0849
E. Ahmed
E.Ahmed and A.H. Hashish
Towards understanding the immune system
6 pages
null
null
null
q-bio.PE
null
It is proposed that using both self-non-self and danger theories give a better understanding of how the immune system works. It is proposed that comparing immune system to police force is useful in this case since police responds both to danger or damage signals and to foreign or suspicious behavior even if no danger signals existed. We also propose that due to low zone tolerance immunotherapy needs to be combined with another treatment method for cancer e.g. chemotherapy or/and radiotherapy to get a sufficient eradication of tumors. Finally we propose that fractional order differential equations are more suitable than the familiar integer order differential equations. A fractional order example of two immune effectors attacking an antigen is given.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 08:30:08 GMT" } ]
2008-01-08T00:00:00
[ [ "Ahmed", "E.", "" ], [ "Hashish", "A. H.", "" ] ]
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801.085
Pablo D. Esquinazi
J. Barzola-Quiquia, R. H\"ohne, M. Rothermel, A. Setzer, P. Esquinazi, and V. Heera
A comparison of the magnetic properties of Proton- and Iron-implanted graphite
4 pages with three figures. To be published in EPJ B
null
10.1140/epjb/e2008-00047-7
null
cond-mat.str-el cond-mat.mtrl-sci
null
In this work we have investigated the changes of the magnetic properties of highly oriented pyrolytic graphite samples after irradiation either with $\sim 3 \times 10^{14}$ protons or $ 3.5 \times 10^{13} ... 3.5 \times 10^{14}$ iron ions with energies in the MeV range. Our results show that iron and proton irradiations can produce similar paramagnetic contributions depending on the implantation temperature. However, only protons induce a ferromagnetic effect.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 09:10:03 GMT" } ]
2009-11-13T00:00:00
[ [ "Barzola-Quiquia", "J.", "" ], [ "Höhne", "R.", "" ], [ "Rothermel", "M.", "" ], [ "Setzer", "A.", "" ], [ "Esquinazi", "P.", "" ], [ "Heera", "V.", "" ] ]
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801.0851
Tomislav Ivezic
Tomislav Ivezic
Generalized Uhlenbeck-Goudsmit hypothesis 'Magnetic' S^{a} and 'Electric' Z^{a} Spins
17 pages, this version is much shorter and all changes are made according to published paper
Phys. Scr. 81 (2010) 025001.
10.1088/0031-8949/81/02/025001
null
physics.gen-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, the connection between the dipole moment tensor D^{ab} and the spin four-tensor S^{ab} is formulated in the form of the generalized Uhlenbeck-Goudsmit hypothesis, D^{ab}=g_{S}S^{ab}. It is also found that the spin four-tensor S^{ab} can be decomposed into two 4-vectors, the usual `space-space' intrinsic angular momentum S^{a}, which will be called `magnetic' spin (mspin), and a new one, the `time-space' intrinsic angular momentum Z^{a}, which will be called `electric' spin (espin). Both spins are equally good physical quantities. Taking into account the generalized Uhlenbeck-Goudsmit hypothesis, the decomposition of S^{ab} and the decomposition of D^{ab} into the dipole moments m^{a} and d^{a}, we find that an electric dipole moment (EDM) of a fundamental particle, as a four-dimensional (4D) geometric quantity, is determined by Z^{a} and not, as generally accepted, by the spin $\mathbf{S}$ as a 3-vector. Also it is shown that neither the T inversion nor the P inversion are good symmetries in the 4D spacetime. In this geometric approach, only the world parity W, Wx^{a}=-x^{a}, is well defined in the 4D spacetime. Some consequences for elementary particle theories and experiments that search for EDM are briefly discussed.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 09:39:01 GMT" }, { "version": "v2", "created": "Wed, 27 Aug 2008 19:04:46 GMT" }, { "version": "v3", "created": "Tue, 23 Mar 2010 06:35:48 GMT" } ]
2015-05-13T00:00:00
[ [ "Ivezic", "Tomislav", "" ] ]
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801.0852
Minh-Tien Tran
Tran Minh-Tien
Statistics of local density of states in the Falicov-Kimball model with local disorder
null
Phys. Rev. B 76, 245122 (2007)
null
null
cond-mat.str-el cond-mat.dis-nn
null
Statistics of the local density of states in the two-dimensional Falicov-Kimball model with local disorder is studied by employing the statistical dynamical mean-field theory. Within the theory the local density of states and its distributions are calculated through stochastic self-consistent equations. The most probable value of the local density of states is used to monitor the metal-insulator transition driven by correlation and disorder. Nonvanishing of the most probable value of the local density of states at the Fermi energy indicates the existence of extended states in the two-dimensional disordered interacting system. It is also found that the most probable value of the local density of states exhibits a discontinuity when the system crosses from extended states to the Anderson localization. A phase diagram is also presented.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 09:54:30 GMT" } ]
2008-01-08T00:00:00
[ [ "Minh-Tien", "Tran", "" ] ]
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801.0853
Grant J. Mathews
G. J. Mathews, N. Q. Lan, C. Kolda
Late Decaying Dark Matter, Bulk Viscosity and the Cosmic Acceleration
8 pages, 3 figures, 1 table
Phys.Rev.D78:043525,2008
10.1103/PhysRevD.78.043525
null
astro-ph
null
We discuss a cosmology in which cold dark matter begins to decay into relativistic particles at a recent epoch (z < 1). We show that the large entropy production and associated bulk viscosity from such decays leads to an accelerating cosmology as required by observations. We investigate the effects of decaying cold dark matter in a Lambda = 0, flat, initially matter dominated cosmology. We show that this model satisfies the cosmological constraint from the redshift-distance relation for type Ia supernovae. The age in such models is also consistent with the constraints from the oldest stars and globular clusters. Possible candidates for this late decaying dark matter are suggested along with additional observational tests of this cosmological paradigm.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 10:28:48 GMT" } ]
2008-11-26T00:00:00
[ [ "Mathews", "G. J.", "" ], [ "Lan", "N. Q.", "" ], [ "Kolda", "C.", "" ] ]
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801.0854
V. V. Kabanov
V.V. Kabanov, R.F. Mamin, and T.S. Shaposhnikova
Localized charged states and phase separation near second order phase transition
null
null
10.1134/S1063776109020113
null
cond-mat.str-el cond-mat.stat-mech
null
Localized charged states and phase segregation are described in the framework of the phenomenological Ginzburg-Landau theory of phase transitions. The Coulomb interactions determines the charge distribution and the characteristic length of the phase separated states. The phase separation with charge segregation becomes possible because of the large dielectric constant and the small density of extra charge in the range of charge localization. The phase diagram is calculated and the energy gain of the phase separated state is estimated. The role of the Coulomb interaction is elucidated.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 11:18:22 GMT" } ]
2009-11-13T00:00:00
[ [ "Kabanov", "V. V.", "" ], [ "Mamin", "R. F.", "" ], [ "Shaposhnikova", "T. S.", "" ] ]
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801.0855
Mao Jirong
Jirong Mao, Jiancheng Wang
A New Scenario on X-ray Shallow Decay of Gamma-ray Bursts
ApJL submitted, comments are welcome
null
null
null
astro-ph
null
In this Letter, we propose that a microphysical process takes a vital role in the shocked region in which the prompt emission of GRBs is emitted. The turbulent energy is included in the internal energy transferred by the kinetic energy of the shock. It dissipates through stochastic acceleration for the electrons to supply the early X-ray emission in the phase of shallow decay. We put the constraints on the time evolution of microphysical parameters. The early X-ray fluxes can be obtained by this scenario and these results are consistent with the Swift observation
[ { "version": "v1", "created": "Sun, 6 Jan 2008 11:23:38 GMT" } ]
2008-01-08T00:00:00
[ [ "Mao", "Jirong", "" ], [ "Wang", "Jiancheng", "" ] ]
[ 0.0421051271, 0.0772306621, -0.0612989925, 0.0067646373, -0.0583149679, 0.0203824211, 0.102670759, 0.060843803, 0.0585678518, -0.009988904, -0.072324723, 0.1012040302, -0.1127860993, 0.0423832983, -0.0098245293, 0.0642830208, -0.1155172437, 0.0109941158, -0.0010336619, 0.0494893268, -0.1091445759, -0.1202714592, -0.0060913349, 0.0601357296, -0.0650922507, -0.0632714853, -0.0522457585, -0.0027295628, 0.0949830934, -0.0373509116, 0.0031673675, -0.0335829481, -0.0450891517, -0.0983211622, 0.0223802011, 0.1433344483, -0.0106337573, -0.0340634249, -0.0235813987, -0.0688855052, 0.0550274812, -0.0897231176, -0.122800298, 0.1307914108, 0.0113860862, 0.0866379365, -0.0376543738, -0.0275137406, 0.0002667132, 0.0057214922, -0.0641312897, -0.0238975044, -0.0276907589, -0.0072640823, -0.0601357296, -0.0937186778, 0.0606920719, 0.037022166, -0.0832492933, -0.0194214638, -0.0050766389, -0.108537659, -0.1126849502, 0.0496663451, -0.0372497588, -0.0744489431, 0.0485283695, 0.1050984412, 0.0494893268, 0.0251239892, -0.0088319611, -0.0096032564, 0.0067014163, -0.0783939287, 0.0309782457, -0.0120625496, 0.0497169234, -0.010646401, 0.0140982624, 0.0364405327, 0.0408407077, 0.0037331947, 0.0059237992, -0.0618553385, -0.049539905, 0.0342657343, 0.0230250545, 0.023505535, -0.0341645814, -0.0223928466, -0.0452914611, 0.0748029798, -0.0375785083, -0.0308012273, -0.0140350424, 0.0212928019, 0.0086991973, -0.0495651923, 0.1299821883, 0.0184352174, 0.0121953133, 0.0136051401, 0.0791020021, -0.1381756216, 0.1091445759, -0.0428384878, -0.1268464327, 0.074145481, -0.0300172884, -0.033684101, 0.0524986424, -0.0344427526, -0.0171834435, 0.1041880623, -0.0702004954, -0.0671153143, -0.1300833374, 0.0015022869, -0.0098940721, 0.0444316566, -0.0211790055, 0.0646370575, 0.010083735, 0.052852679, 0.0338864066, -0.01345341, 0.0797595009, -0.0988269225, -0.1295775771, 0.0204835739, 0.097056739, -0.0971578956, -0.0387164839, -0.113190718, -0.023695197, -0.0350243822, 0.0261987448, -0.0661543608, -0.0337093882, 0.0279436428, -0.0030425063, -0.0069416561, 0.0235181786, 0.0013236878, 0.0082756169, 0.0908863768, 0.021634195, 0.064738214, -0.0038627975, 0.017765075, 0.0232526511, -0.1115722582, -0.0084210252, -0.0150339324, 0.0588207357, -0.0973096266, 0.0886104256, 0.0655474365, 0.0319644921, -0.1197656915, 0.0066255513, -0.0029745437, -0.0632209107, 0.0224307794, 0.0585678518, -0.0568988174, -0.0230503436, 0.0592253469, -0.1311960369, -0.0684808865, -0.1091445759, -0.1014063358, -0.0201168936, -0.0063284133, -0.0134281209, 0.0844631344, -0.0371233188, -0.1214853004, -0.0151224416, -0.026097592, -0.0216089077, 0.053257294, -0.0032843263, -0.030346036, 0.0478202961, -0.0540159456, 0.0581126586, 0.0997373089, 0.0733362585, -0.058972463, -0.0314840116, 0.1050984412, -0.0027327237, 0.0960452035, -0.0037173894, -0.1354444772, 0.0305230562, -0.0409671478, 0.0062683532, 0.0718695298, 0.0385141782, 0.1471782774, 0.0146166747, -0.1143034026, 0.0171202216, -0.0287022926, 0.0771800876, -0.0170822907, -0.0531055629, 0.0677728131, 0.0822883397, -0.1045926735, -0.0085158562, -0.0165259466, -0.1081330404, -0.0891161934, 0.05381364, 0.1430309862, 0.0557861291, -0.0075485767, 0.0037964156, 0.0092871515, 0.0663566664, 0.0315851681, 0.0217985697, 0.040865995, 0.0960452035, -0.054724019, 0.0952865556, 0.0519423001, 0.0023028217, 0.0269573964, -0.0550274812, -0.1191587672, 0.0491858684, -0.027286144, 0.0288034473, -0.0099067166, 0.0079405466, -0.065648593, 0.0493123084, 0.0859804377, -0.0023265295, 0.0501215383, -0.0174616147, 0.0461259745, -0.0679245442, -0.0714649186, 0.0009878267, 0.038488891, 0.0945784822, -0.0103113307, -0.0655474365, 0.0092555415, 0.0362888016, -0.037022166 ]
801.0856
Sen-Yue Lou
Xiaoyu Jiao, Ruoxia Yao, Shunli Zhang and S. Y. Lou
Approximate symmetry reduction approach: infinite series reductions to the KdV-Burgers equation
14 pages. The original model (1) in previous version is generalized to a more extensive form and the incorrect equations (35) and (36) in previous version are corrected
null
10.1515/zna-2009-1102
null
nlin.SI nlin.PS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
For weak dispersion and weak dissipation cases, the (1+1)-dimensional KdV-Burgers equation is investigated in terms of approximate symmetry reduction approach. The formal coherence of similarity reduction solutions and similarity reduction equations of different orders enables series reduction solutions. For weak dissipation case, zero-order similarity solutions satisfy the Painlev\'e II, Painlev\'e I and Jacobi elliptic function equations. For weak dispersion case, zero-order similarity solutions are in the form of Kummer, Airy and hyperbolic tangent functions. Higher order similarity solutions can be obtained by solving linear ordinary differential equations.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 11:48:32 GMT" }, { "version": "v2", "created": "Fri, 26 Sep 2008 10:29:15 GMT" } ]
2015-05-13T00:00:00
[ [ "Jiao", "Xiaoyu", "" ], [ "Yao", "Ruoxia", "" ], [ "Zhang", "Shunli", "" ], [ "Lou", "S. Y.", "" ] ]
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801.0857
Wenfeng Jiang
Lei Hu, Xiangyong Zeng, Nian Li, and Wenfeng Jiang
Period-Different $m$-Sequences With At Most A Four-Valued Cross Correlation
9 pages
null
null
null
cs.IT cs.DM math.IT
null
In this paper, we follow the recent work of Helleseth, Kholosha, Johanssen and Ness to study the cross correlation between an $m$-sequence of period $2^m-1$ and the $d$-decimation of an $m$-sequence of shorter period $2^{n}-1$ for an even number $m=2n$. Assuming that $d$ satisfies $d(2^l+1)=2^i({\rm mod} 2^n-1)$ for some $l$ and $i$, we prove the cross correlation takes exactly either three or four values, depending on ${\rm gcd}(l,n)$ is equal to or larger than 1. The distribution of the correlation values is also completely determined. Our result confirms the numerical phenomenon Helleseth et al found. It is conjectured that there are no more other cases of $d$ that give at most a four-valued cross correlation apart from the ones proved here.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 13:31:40 GMT" } ]
2008-01-08T00:00:00
[ [ "Hu", "Lei", "" ], [ "Zeng", "Xiangyong", "" ], [ "Li", "Nian", "" ], [ "Jiang", "Wenfeng", "" ] ]
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801.0858
Shigeru Yamagami
Shigeru Yamagami
Geometric Mean of States and Transition Amplitudes
12pages
Lett Math Phys, 84(2008), 123--137
10.1007/s11005-008-0238-7
null
math-ph math.MP math.OA
null
The transition amplitude between square roots of states, which is an analogue of Hellinger integral in classical measure theory, is investigated in connection with operator-algebraic representation theory. A variational expression based on geometric mean of positive forms is utilized to obtain an approximation formula for transition amplitudes.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 12:42:13 GMT" } ]
2008-08-30T00:00:00
[ [ "Yamagami", "Shigeru", "" ] ]
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801.0859
Masaki Iwasawa
Masaki Iwasawa, Yoko Funato and Junichiro Makino
Evolution of Massive Blackhole Triples II -- The effect of the BH triples dynamics on the structure of the galactic nuclear
Submitted to ApJ
null
null
null
astro-ph
null
In this paper, we investigate the structures of galaxies which either have or have had three BHs using $N$-body simulations, and compare them with those of galaxies with binary BHs. We found that the cusp region of a galaxy which have (or had) triple BHs is significantly larger and less dense than that of a galaxy with binary BHs of the same mass. Moreover, the size of the cusp region depends strongly on the evolution history of triple BHs, while in the case of binary BHs, the size of the cusp is determined by the mass of the BHs. In galaxies which have (or had) three BHs, there is a region with significant radial velocity anisotropy, while such a region is not observed in galaxies with binary BH. These differences come from the fact that with triple BHs the energy deposit to the central region of the galaxy can be much larger due to multiple binary-single BH scatterings. Our result suggests that we can discriminate between galaxies which experienced triple BH interactions with those which did not, through the observable signatures such as the cusp size and velocity anisotropy.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 13:15:00 GMT" } ]
2008-01-08T00:00:00
[ [ "Iwasawa", "Masaki", "" ], [ "Funato", "Yoko", "" ], [ "Makino", "Junichiro", "" ] ]
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801.086
Sebastien Aumaitre
Eric Falcon, Sebastien Aumaitre, Claudio Falcon, Claude Laroche, Stephan Fauve
Fluctuations of energy flux in wave turbulence
submitted to PRL
null
10.1103/PhysRevLett.100.064503
null
physics.flu-dyn
null
We report that the power driving gravity and capillary wave turbulence in a statistically stationary regime displays fluctuations much stronger than its mean value. We show that its probability density function (PDF) has a most probable value close to zero and involves two asymmetric roughly exponential tails. We understand the qualitative features of the PDF using a simple Langevin type model.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 13:22:30 GMT" } ]
2009-11-13T00:00:00
[ [ "Falcon", "Eric", "" ], [ "Aumaitre", "Sebastien", "" ], [ "Falcon", "Claudio", "" ], [ "Laroche", "Claude", "" ], [ "Fauve", "Stephan", "" ] ]
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801.0861
Tomasz Konopka
Tomasz Konopka, Fotini Markopoulou, Simone Severini
Quantum Graphity: a model of emergent locality
25 pages
Phys.Rev.D77:104029,2008
10.1103/PhysRevD.77.104029
ITP-UU-08/02, SPIN-08/02
hep-th gr-qc quant-ph
null
Quantum graphity is a background independent model for emergent locality, spatial geometry and matter. The states of the system correspond to dynamical graphs on N vertices. At high energy, the graph describing the system is highly connected and the physics is invariant under the full symmetric group acting on the vertices. We present evidence that the model also has a low-energy phase in which the graph describing the system breaks permutation symmetry and appears to be ordered, low-dimensional and local. Consideration of the free energy associated with the dominant terms in the dynamics shows that this low-energy state is thermodynamically stable under local perturbations. The model can also give rise to an emergent U(1) gauge theory in the ground state by the string-net condensation mechanism of Levin and Wen. We also reformulate the model in graph-theoretic terms and compare its dynamics to some common graph processes.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 13:39:18 GMT" }, { "version": "v2", "created": "Fri, 23 May 2008 07:18:16 GMT" } ]
2008-11-26T00:00:00
[ [ "Konopka", "Tomasz", "" ], [ "Markopoulou", "Fotini", "" ], [ "Severini", "Simone", "" ] ]
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801.0862
Pedro Lind
Andr\'es A. Pe\~na, Sean McNamara, Pedro G. Lind, Hans J. Herrmann
Avalanches in anisotropic sheared granular media
10 pages, 12 figures
Granular Matter 11, 243-252 (2009)
null
null
cond-mat.mtrl-sci
null
We study the influence of particle shape anisotropy on the occurrence of avalanches in sheared granular media. We use molecular dynamic simulations to calculate the relative movement of two tectonic plates. % with transform boundaries. Our model considers irregular polygonal particles constituting the material within the shear zone. We find that the magnitude of the avalanches is approximately independent on particle shape and in good agreement with the Gutenberg-Richter law, but the aftershock sequences are strongly influenced by the particle anisotropy yielding variations on the exponent characterizing the empirical Omori's law. Our findings enable one to identify the presence of anisotropic particles at the macro-mechanical level only by observing the avalanche sequences of real faults. In addition, we calculate the probability of occurrence of an avalanche for given values of stiffness or frictional strength and observe also a significant influence of the particle anisotropy.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 13:38:45 GMT" } ]
2011-03-15T00:00:00
[ [ "Peña", "Andrés A.", "" ], [ "McNamara", "Sean", "" ], [ "Lind", "Pedro G.", "" ], [ "Herrmann", "Hans J.", "" ] ]
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801.0863
Michael Gruberbauer
M. Gruberbauer, H. Saio, D. Huber, T. Kallinger, W.W. Weiss, D.B. Guenther, R. Kuschnig, J.M. Matthews, A.F.J. Moffat, S. Rucinski, D. Sasselov, G.A.H. Walker
MOST photometry and modeling of the rapidly oscillating (roAp) star gamma Equ
10 pages, 12 figures, published in Astronomy & Astrophysics typos corrected, and minor changes in appearance and wording
null
10.1051/0004-6361:20078830
null
astro-ph
null
Aims. Despite photometry and spectroscopy of its oscillations obtained over the past 25 years, the pulsation frequency spectrum of the rapidly oscillating Ap (roAp) star gamma Equ has remained poorly understood. Better time-series photometry, combined with recent advances to incorporate interior magnetic field geometry into pulsational models, enable us to perform improved asteroseismology of this roAp star. Methods. We obtained 19 days of continuous high-precision photometry of gamma Equ with the MOST (Microvariability & Oscillations of STars) satellite. The data were reduced with two different reduction techniques and significant frequencies were identified. Those frequencies were fitted by interpolating a grid of pulsation models that include dipole magnetic fields of various polar strengths. Results. We identify 7 frequencies in gamma Equ that we associate with 5 high-overtone p-modes and 1st and 2nd harmonics of the dominant p-mode. One of the modes and both harmonics are new discoveries for this star. Our best model solution (1.8 M_sun, log T_eff ~ 3.882; polar field strength ~8.1 kG) leads to unique mode identifications for these frequencies (ell = 0, 1, 2 and 4). This is the first purely asteroseismic fit to a grid of magnetic models. We measure amplitude and phase modulation of the primary frequency due to beating with a closely spaced frequency which had never been resolved. This casts doubts on theories that such modulation - unrelated to the rotation of the star - is due to a stochastic excitation mechanism.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 13:41:30 GMT" }, { "version": "v2", "created": "Wed, 27 Feb 2008 12:46:54 GMT" } ]
2008-02-27T00:00:00
[ [ "Gruberbauer", "M.", "" ], [ "Saio", "H.", "" ], [ "Huber", "D.", "" ], [ "Kallinger", "T.", "" ], [ "Weiss", "W. W.", "" ], [ "Guenther", "D. B.", "" ], [ "Kuschnig", "R.", "" ], [ "Matthews", "J. M.", "" ], [ "Moffat", "A. F. J.", "" ], [ "Rucinski", "S.", "" ], [ "Sasselov", "D.", "" ], [ "Walker", "G. A. H.", "" ] ]
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801.0864
Marco Montalto
M. Montalto (1), A. Riffeser (2), U. Hopp (1 and 2), S. Wilke (2), G. Carraro (3) ((1) MPE, Munchen, Germany, (2) Universitats-Sternwarte Munchen, Germany, (3) ESO Santiago)
The comet 17P/Holmes 2007 outburst: the early motion of the outburst material
5 pages, 3 figures, A&A accepted
null
10.1051/0004-6361:20079130
null
astro-ph
null
Context. On October 24, 2007 the periodic comet 17P/Holmes underwent an astonishing outburst that increased its apparent total brightness from magnitude V\sim17 up to V\sim2.5 in roughly two days. We report on Wendelstein 0.8 m telescope (WST) photometric observations of the early evolution stages of the outburst. Aims. We studied the evolution of the structure morphology, its kinematic, and estimated the ejected dust mass. Methods. We analized 126 images in the BVRI photometric bands spread between 26/10/2007 and 20/11/2007. The bright comet core appeared well separated from that one of a quickly expanding dust cloud in all the data, and the bulk of the latter was contained in the field of view of our instrument. The ejected dust mass was derived on the base of differential photometry on background stars occulted by the moving cloud. Results. The two cores were moving apart from each other at a relative projected constant velocity of (9.87 +/- 0.07) arcsec/day (0.135 +/-0.001 km/sec). In the inner regions of the dust cloud we observed a linear increase in size at a mean constant velocity of (14.6+/-0.3) arcsec/day (0.200+/-0.004 km/sec). Evidence of a radial velocity gradient in the expanding cloud was also found. Our estimate for the expanding coma's mass was of the order of 10^{-2}-1 comet's mass implying a significant disintegration event. Conclusions. We interpreted our observations in the context of an explosive scenario which was more probably originated by some internal instability processes, rather than an impact with an asteroidal body. Due to the peculiar characteristics of this event, further observations and investigations are necessary in order to enlight the nature of the physical processes that determined it.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 16:17:56 GMT" } ]
2009-11-13T00:00:00
[ [ "Montalto", "M.", "", "1 and 2" ], [ "Riffeser", "A.", "", "1 and 2" ], [ "Hopp", "U.", "", "1 and 2" ], [ "Wilke", "S.", "" ], [ "Carraro", "G.", "" ] ]
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801.0865
EDA Publishing Association
M. Janicki, Jedrzej Banaszczyk, G. De Mey, M. Kaminski, B. Vermeersch, A. Napieralski
Application of Structure Functions for the Investigation of Forced Air Cooling
Submitted on behalf of TIMA Editions (http://irevues.inist.fr/tima-editions)
Dans 13th International Worshop on THERMal INvestigations of ICs and Systems - THERMINIC 2007, Budapest : Hongrie (2007)
null
null
physics.gen-ph
null
This paper presents thermal analyses of a power amplifier placed in a wind tunnel. All the investigations are based on the transient temperature measurements performed during the circuit cooling process. The measured cooling curves were used to compute the cumulative and differential structure functions for the circuit with a heat sink. These functions helped to determine the optimal values of circuit model parameters necessary for numerical thermal simulations. The experiments demonstrated the influence of the wind speed on the value of the heat transfer coefficient and consequently on the temperature of the entire structure.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 14:54:55 GMT" } ]
2008-01-08T00:00:00
[ [ "Janicki", "M.", "" ], [ "Banaszczyk", "Jedrzej", "" ], [ "De Mey", "G.", "" ], [ "Kaminski", "M.", "" ], [ "Vermeersch", "B.", "" ], [ "Napieralski", "A.", "" ] ]
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801.0866
Djamel-Eddine Boumediene
Djamel-Eddine Boumediene, Pascal Gay
Higgs self coupling measurement
LCWS Proceeding
ECONF C0705302:HIG06,2007
null
null
hep-ex
null
A measurement of the Higgs self coupling from e+e- collisions in the International Linear Collider is presented. The impact of the detector performance in terms of $b$-tagging and particle flow is investigated.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 14:54:34 GMT" } ]
2009-02-16T00:00:00
[ [ "Boumediene", "Djamel-Eddine", "" ], [ "Gay", "Pascal", "" ] ]
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801.0867
Florentin Smarandache
Rajesh Singh, Jayant Singh, Florentin Smarandache
A Note on Testing of Hypothesis
5 pages
null
null
null
math.GM
null
In this paper, a problem of testing is discussed when the samples have been drawn from the normal distribution. The study of hypothesis testing is also extended to Baye's set up.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 15:09:58 GMT" } ]
2008-01-08T00:00:00
[ [ "Singh", "Rajesh", "" ], [ "Singh", "Jayant", "" ], [ "Smarandache", "Florentin", "" ] ]
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801.0868
Alejandro Fernandez-Martinez
Gabriel Cuello (ILL), Andrea Piarristeguy (ICGICMMM), Alejandro Fernandez-Martinez (ILL, LGIT), Marcelo Fontana (LSA), A. Pradel (ICGICMMM)
Structure of chalcogenide glasses by neutron diffraction
5 pages. Proceedings International Workshop Non-crystalline Solids, Gijon (Spain)
Journal of Non-Crystalline Solids 353 (2006) 729-732
10.1016/j.jnoncrysol.2006.12.036
null
physics.chem-ph cond-mat.mtrl-sci
null
The purpose of this work is to study the change in the structure of the Ge-Se network upon doping with Ag. The total structure factor S(Q) for two samples has been measured by neutron diffraction using the two-axis diffractometer dedicated to structural studies of amorphous materials, D4, at the Institut Laue Langevin. We have derived the corresponding radial distribution functions for each sample and each temperature, which gives us an insight about the composition and temperature dependence of the correlation distances and coordination numbers in the short-range. Our results are compatible with the presence of both GeSe4/2 tetrahedra and Se-Se bonds. The Ag atoms are linked to Se in a triangular environment. Numerical simulations allowing the identification of the main peaks in the total pair correlation functions have complemented the neutron diffraction measurements.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 15:27:16 GMT" } ]
2008-01-08T00:00:00
[ [ "Cuello", "Gabriel", "", "ILL" ], [ "Piarristeguy", "Andrea", "", "ICGICMMM" ], [ "Fernandez-Martinez", "Alejandro", "", "ILL, LGIT" ], [ "Fontana", "Marcelo", "", "LSA" ], [ "Pradel", "A.", "", "ICGICMMM" ] ]
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801.0869
Alejandro Fernandez-Martinez
Alejandro Fernandez-Martinez (LGIT, ILL), P. Gorria, Gabriel Cuello (ILL), J. D. Santos, M. J. Perez
Kinetics of crystallization of FeB-based amorphous alloys studied by neutron thermo-diffractometry
3 pages. Proceedings International Workshop Non-Crystalline Solids 2006, Gijon (Spain)
Journal of Non-Crystalline Solids 353 (2007) 855-858
10.1016/j.jnoncrysol.2006.12.091
null
cond-mat.mtrl-sci
null
Kinetics of crystallization of two amorphous alloys, Fe70Cr10B20 and Fe80Zr10B10, have been followed up by neutron thermodiffractometry experiments performed in the two axis diffractometer D20 (ILL, Grenoble). The structural changes are directly correlated with the temperature dependence of the magnetization. Fe70Cr10B20 crystallizes following a two-step process: an eutectic crystallization of alfa-Fe (bcc) and the metastable tetragonal phase (Fe0.8Cr0.2)3B followed by another eutectic transformation to the stable phase (Fe0.75Cr0.25)2B and more segregation of alfa-Fe. These tetragonal phases are magnetically anisotropic, giving rise to a large increase of the coercivity. This behaviour is similar to that of Fe80B20 alloys, with Cr atoms replacing the Fe positions in both crystalline phases. Fe80Zr10B10 shows also a two-step process in which two polymorphic transformations take place.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 15:30:17 GMT" } ]
2008-01-08T00:00:00
[ [ "Fernandez-Martinez", "Alejandro", "", "LGIT, ILL" ], [ "Gorria", "P.", "", "ILL" ], [ "Cuello", "Gabriel", "", "ILL" ], [ "Santos", "J. D.", "" ], [ "Perez", "M. J.", "" ] ]
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801.087
Edo Noordermeer
E. Noordermeer
The rotation curves of flattened Sersic bulges
7 pages, 4 figures. Accepted for publication in MNRAS
null
10.1111/j.1365-2966.2008.12837.x
null
astro-ph
null
I present a method to deproject the observed intensity profile of an axisymmetric bulge with arbitrary flattening to derive the 3D luminosity density profile and to calculate the contribution of the bulge to the rotation curve. I show the rotation curves for a family of fiducial bulges with Sersic surface brightness profiles and with various concentrations and intrinsic axis ratios. Both parameters have a profound impact on the shape of the rotation curve. In particular, I show how the peak rotation velocity, as well as the radius where it is reached, depend on both parameters. I also discuss the implications of the flattening of a bulge for the decomposition of a rotation curve and use the case of NGC 5533 to show the errors that result from neglecting it. For NGC 5533, neglecting the flattening of the bulge leads to an overestimate of its mass-to-light ratio by approximately 30% and an underestimate of the contributions from the stellar disc and dark matter halo in the regions outside the bulge-dominated area.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 15:32:07 GMT" } ]
2009-11-13T00:00:00
[ [ "Noordermeer", "E.", "" ] ]
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801.0871
Mina Koleva
M. Koleva, Ph. Prugniel, P. Ocvirk, D. Le Borgne and C. Soubiran
Spectroscopic ages and metallicities of stellar populations: validation of full spectrum fitting
accepted in MNRAS; Full version available at http://www-obs.univ-lyon1.fr/labo/perso/prugniel/mina/koleva.pdf
null
10.1111/j.1365-2966.2008.12908.x
null
astro-ph
null
Fitting whole spectra at intermediate spectral resolution (R = 1000 -- 3000), to derive physical properties of stellar populations, appears as an optimized alternative to methods based on spectrophotometric indices: it uses all the redundant information contained in the signal. This paper addresses the validation of the method and it investigates the quality of the population models together with the reliability of the fitting procedures. We are using two algorithms: STECKMAP, a non-parametric regularized program and NBURSTS a parametric non-linear minimization. We compare three spectral synthesis models for single stellar populations: Pegase-HR, Galaxev (BC03) and Vazdekis/Miles, and we analyse spectra of Galactic clusters whose populations are known from studies of color-magnitude diagrams (CMD) and spectroscopy of individual stars. We find that: (1) The quality of the models critically depends on the stellar library they use. Pegase-HR and Vazdekis/Miles are consistent, while the comparison between Pegase-HR and BC03 shows some systematics reflecting the limitations of the stellar library (STELIB) used to generate the latter models; (2) The two fitting programs are consistent; (3) For globular clusters and M67 spectra, the method restitutes metallicities in agreement with spectroscopy of stars within 0.14 dex; (4) The spectroscopic ages are very sensitive to the presence of a blue horizontal branch (BHB) or of blue stragglers. A BHB morphology results in a young SSP-equivalent age. Fitting a free amount of blue stars in addition to the SSP model to mimic the BHB improves and stabilizes the fit and restores ages in agreement with CMDs studies. This method is potentially able to disentangle age or BHB effects in extragalactic clusters.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 16:18:30 GMT" } ]
2009-11-13T00:00:00
[ [ "Koleva", "M.", "" ], [ "Prugniel", "Ph.", "" ], [ "Ocvirk", "P.", "" ], [ "Borgne", "D. Le", "" ], [ "Soubiran", "C.", "" ] ]
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801.0872
Alexander S. Sakharov
Nick E. Mavromatos, Anselmo Meregaglia, Andre Rubbia, Alexander Sakharov and Sarben Sarkar
Quantum-Gravity Decoherence Effects in Neutrino Oscillations: Expected Constraints from CNGS and J-PARC
40 pages, 8 figures, minor corrections
Phys.Rev.D77:053014,2008
10.1103/PhysRevD.77.053014
CERN-TH-PH/2007-267
hep-ph gr-qc hep-th
null
Quantum decoherence, the evolution of pure states into mixed states, may be a feature of quantum-gravity models. In most cases, such models lead to fewer neutrinos of all active flavours being detected in a long baseline experiment as compared to three-flavour standard neutrino oscillations. We discuss the potential of the CNGS and J-PARC beams in constraining models of quantum-gravity induced decoherence using neutrino oscillations as a probe. We use as much as possible model-independent parameterizations, even though they are motivated by specific microscopic models, for fits to the expected experimental data which yield bounds on quantum-gravity decoherence parameters.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 16:17:52 GMT" }, { "version": "v2", "created": "Fri, 11 Jan 2008 19:33:22 GMT" } ]
2008-11-26T00:00:00
[ [ "Mavromatos", "Nick E.", "" ], [ "Meregaglia", "Anselmo", "" ], [ "Rubbia", "Andre", "" ], [ "Sakharov", "Alexander", "" ], [ "Sarkar", "Sarben", "" ] ]
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