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801.4073
Aleksandr Pyatakov P.
A.S. Logginov, G.A. Meshkov, V.A. Nikolaev, A.P. Pyatakov, A.K. Zvezdin
Magnetoelectric Control of Domain Walls in a Ferrite Garnet Film
5 pages, 2 figures
JETP Letters, v.86, p.115 (2007)
10.1134/S0021364007140093
null
cond-mat.mtrl-sci
null
The effect of magnetic domain boundaries displacement induced by electric field is observed in epitaxial ferrite garnet films (on substrates with the (210) crystallographic orientation). The effect is odd with respect to the electric field (the direction of wall displacement changes with the polarity of the voltage) and even with respect to the magnetization in domains. The inhomogeneous magnetoelectric interaction as a possible mechanism of the effect is proposed.
[ { "version": "v1", "created": "Sat, 26 Jan 2008 12:32:06 GMT" } ]
2008-01-29T00:00:00
[ [ "Logginov", "A. S.", "" ], [ "Meshkov", "G. A.", "" ], [ "Nikolaev", "V. A.", "" ], [ "Pyatakov", "A. P.", "" ], [ "Zvezdin", "A. K.", "" ] ]
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801.4074
Kourosh Nozari
Kourosh Nozari and S. Hamid Mehdipour
Hawking Radiation as Quantum Tunneling from Noncommutative Schwarzschild Black Hole
19 Pages, 4 Figures, revised, new material and references added
Class.Quant.Grav.25:175015,2008
10.1088/0264-9381/25/17/175015
null
gr-qc
null
We study tunneling process through quantum horizon of a Schwarzschild black hole in noncommutative spacetime. This is done by considering the effect of smearing of the particle mass as a Gaussian profile in flat spacetime. We show that even in this noncommutative setup there will be no correlation between the different modes of radiation which reflects the fact that information doesn't come out continuously during the evaporation process at least at late-time. However, due to spacetime noncommutativity, information might be preserved by a stable black hole remnant.
[ { "version": "v1", "created": "Sat, 26 Jan 2008 12:26:08 GMT" }, { "version": "v2", "created": "Mon, 4 Feb 2008 07:43:21 GMT" }, { "version": "v3", "created": "Wed, 21 May 2008 12:17:10 GMT" } ]
2008-11-26T00:00:00
[ [ "Nozari", "Kourosh", "" ], [ "Mehdipour", "S. Hamid", "" ] ]
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801.4075
Daniel G. Barci
Daniel G. Barci, Marta Trobo, Victoria Fern\'andez, Luis E. Oxman
Competition between Pomeranchuk instabilities in the nematic and hexatic channels in a two-dimensional spinless Fermi fluid
7 pages, 2 figures. Shorter and improved version, as will appear in PRB
Phys. Rev. B78, 035114 (2008).
10.1103/PhysRevB.78.035114
null
cond-mat.str-el cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the competition between the nematic and the hexatic phases of a two-dimensional spinless Fermi fluid near Pomeranchuk instabilities. We show that the general phase diagram of this theory contains a bicritical point where two second order lines and a first order nematic/hexatic phase transition meet together. We found that at criticality, and deep inside the associated symmetry broken phases, the low energy theory is governed by a dissipative cubic mode, even near the bicritical point where nematic and hexatic fluctuations cannot be distinguished due to very strong dynamical couplings.
[ { "version": "v1", "created": "Sat, 26 Jan 2008 12:39:06 GMT" }, { "version": "v2", "created": "Sat, 21 Jun 2008 00:41:02 GMT" } ]
2008-07-15T00:00:00
[ [ "Barci", "Daniel G.", "" ], [ "Trobo", "Marta", "" ], [ "Fernández", "Victoria", "" ], [ "Oxman", "Luis E.", "" ] ]
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801.4076
Guy Roos
Guy Roos (St Petersburg, Russian Federation)
Exceptional symmetric domains
Lectures at the Workshop "Several Complex Variables, Analysis on Complex Lie groups and Homogeneous Spaces", held at Zhejiang University, Hangzhou, China, Oct. 17-29, 2005. 36 pages. Version 2: minor corrections
Gilligan, Bruce (ed.) et al., Symmetries in complex analysis. AMS, Contemporary Mathematics 468, 157-189 (2008).
null
null
math.CV math.RA
null
We give the presentation of exceptional bounded symmetric domains using the Albert algebra and exceptional Jordan triple systems. The first chapter is devoted to Cayley-Graves algebras, the second to exceptional Jordan triple systems. In the third chapter, we give a geometric description of the two exceptional bounded symmetric domains, their boundaries and their compactification.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 16:31:15 GMT" }, { "version": "v2", "created": "Sat, 23 Feb 2008 05:08:24 GMT" } ]
2008-12-13T00:00:00
[ [ "Roos", "Guy", "", "St Petersburg, Russian Federation" ] ]
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801.4077
Volker Eyert
Volker Eyert, Raymond Fresard, and Antoine Maignan
On the metallic conductivity of the delafossites PdCoO2 and PtCoO2
5 pages, 7 figures, more information at http://www.physik.uni-augsburg.de/~eyert/
Chem. Mater. 20, 2370-2373 (2008)
10.1021/cm703404e
null
cond-mat.mtrl-sci cond-mat.str-el
null
The origin of the quasi two-dimensional behavior of PdCoO2 and PtCoO2 is investigated by means of electronic structure calculations. They are performed using density functional theory in the generalized gradient approximation as well as the new full-potential augmented spherical wave method. We show that the electric conductivity is carried almost exclusively by the in-plane Pd (Pt) d orbitals. In contrast, the insulating CoO2 sandwich layers of octahedrally coordinated Co atoms may be regarded as charge carrier reservoirs. This leads to a weak electronic coupling of the Pd (Pt) layers. The obtained nearly cylindrical Fermi surface causes the strong anisotropy of the electric conductivity.
[ { "version": "v1", "created": "Sat, 26 Jan 2008 13:19:39 GMT" } ]
2008-03-18T00:00:00
[ [ "Eyert", "Volker", "" ], [ "Fresard", "Raymond", "" ], [ "Maignan", "Antoine", "" ] ]
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801.4078
Akhlesh Lakhtakia
A. Lakhtakia
Polarization--universal rejection filtering by ambichiral structures made of indefinite dielectric--magnetic materials
Cleaned citations in the text
null
10.1088/0031-8949/77/05/055401
null
physics.optics
null
An ambichiral structure comprising sheets of an anisotropic dielectric material rejects normally incident plane waves of one circular polarization (CP) state but not of the other CP state, in its fundamental Bragg regime. However, if the same structure is made of an dielectric--magnetic material with indefinite permittivity and permeability dyadics, it may function as a polarization--universal rejection filter because two of the four planewave components of the electromagnetic field phasors in each sheet are of the positive--phase--velocity type and two are of the negative--phase--velocity type.
[ { "version": "v1", "created": "Sat, 26 Jan 2008 14:06:03 GMT" } ]
2009-11-13T00:00:00
[ [ "Lakhtakia", "A.", "" ] ]
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801.4079
Elena Dubrova
Elena Dubrova (Royal Institute of Technology)
An equivalence preserving transformation from the Fibonacci to the Galois NLFSRs
14 pages, 4 figures, one reference added, example 4 corrected
null
null
null
cs.CR
null
Conventional Non-Linear Feedback Shift Registers (NLFSRs) use the Fibonacci configuration in which the value of the first bit is updated according to some non-linear feedback function of previous values of other bits, and each remaining bit repeats the value of its previous bit. We show how to transform the feedback function of a Fibonacci NLFSR into several smaller feedback functions of individual bits. Such a transformation reduces the propagation time, thus increasing the speed of pseudo-random sequence generation. The practical significance of the presented technique is that is makes possible increasing the keystream generation speed of any Fibonacci NLFSR-based stream cipher with no penalty in area.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 20:07:40 GMT" }, { "version": "v2", "created": "Wed, 30 Jan 2008 15:26:54 GMT" } ]
2008-01-30T00:00:00
[ [ "Dubrova", "Elena", "", "Royal Institute of Technology" ] ]
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801.408
Eric R. Sharpe
Eric Sharpe
Recent developments in heterotic compactifications
24 pages, LaTeX, 2 figures. Contribution to the proceedings of the Virginia Tech Sowers workshop, May 2007
AMS/IP Stud.Adv.Math. 44 (2008) 209-230
null
VPI-IPNAS-08-02
hep-th
null
In this short review, we outline three sets of developments in understanding heterotic string compactifications. First, we outline recent progress in heterotic analogues of quantum cohomology computations. Second, we discuss a potential swampland issue in heterotic strings, and new heterotic string constructions that can be used to fill in the naively missing theories. Third, we discuss recent developments in string compactifications on stacks and their applications, concluding with an outline of work-in-progress on heterotic string compactifications on gerbes.
[ { "version": "v1", "created": "Sat, 26 Jan 2008 14:22:39 GMT" } ]
2016-08-29T00:00:00
[ [ "Sharpe", "Eric", "" ] ]
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801.4081
Yurii Kosovtsov
Yu. N. Kosovtsov
The general solutions of some nonlinear second order PDEs.I. Two independent variables, constant parameters
35 pages
null
null
null
math-ph math.MP nlin.SI
null
In the first part of planned series of papers the formal general solutions to selection of 80 examples of different types of second order nonlinear PDEs in two independent variables with constant parameters are given. The main goal here is to show on examples the types of solvable PDEs and what their general solutions look like. The solving strategy, used here, as a rule is the order reduction. The order reduction method is implemented in Maple procedure, which applicable to PDEs of different order with different number of independent variables. Some of given PDEs are solved by order lifting to PDEs, which are solvable by the subsequent order reduction.
[ { "version": "v1", "created": "Sat, 26 Jan 2008 15:13:26 GMT" } ]
2008-01-29T00:00:00
[ [ "Kosovtsov", "Yu. N.", "" ] ]
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801.4082
Marcello Caleffi
Marcello Caleffi, Giancarlo Ferraiuolo, Luigi Paura
On Reliability of Dynamic Addressing Routing Protocols in Mobile Ad Hoc Networks
Proc. of WRECOM '07: Wireless Rural and Emergency Communications Conference, Roma (Italy), October 2007
null
null
null
cs.NI cs.DC
null
In this paper, a reliability analysis is carried out to state a performance comparison between two recently proposed proactive routing algorithms. These protocols are able to scale in ad hoc and sensor networks by resorting to dynamic addressing, to face with the topology variability, which is typical of ad hoc, and sensor networks. Numerical simulations are also carried out to corroborate the results of the analysis.
[ { "version": "v1", "created": "Sat, 26 Jan 2008 15:15:21 GMT" } ]
2008-01-29T00:00:00
[ [ "Caleffi", "Marcello", "" ], [ "Ferraiuolo", "Giancarlo", "" ], [ "Paura", "Luigi", "" ] ]
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801.4083
Pascal Daniel Nef
Pascal D. Nef, Slavek M. Rucinski
Luminosity function of contact binaries at high galactic latitudes towards the LMC and the SMC
accepted by MNRAS
null
10.1111/j.1365-2966.2008.12994.x
null
astro-ph
null
Using the OGLE catalogue of eclipsing binaries, 15 contact binaries were identified towards the SMC and the LMC at vertical distances from the Galactic plane between 300 pc and 10 kpc. Based on the luminosity function calculated for these contact binaries, we estimated a frequency of occurrence relative to Main Sequence stars in the thick disk at roughly 1/600. This estimate suffers from the small number statistics, but is consistent with the value previously found for the solar neighbourhood.
[ { "version": "v1", "created": "Sat, 26 Jan 2008 15:19:32 GMT" } ]
2009-11-13T00:00:00
[ [ "Nef", "Pascal D.", "" ], [ "Rucinski", "Slavek M.", "" ] ]
[ -0.0042164517, 0.0184134636, 0.1118212715, -0.0374849848, 0.0117597561, 0.0571292602, 0.0163783543, -0.0664395764, 0.0129905706, -0.0633686334, -0.0976364464, 0.0028454955, -0.0294176694, -0.0111991875, 0.0615650676, 0.0841340497, -0.0205948073, 0.0258836504, 0.0050329319, 0.0454304367, 0.0270291604, -0.0247381404, 0.0012026331, 0.0165002178, -0.1068492681, -0.0394347906, -0.0083475988, -0.0082135499, 0.0884723663, -0.0640023202, 0.0393616706, -0.0102486582, -0.0051517482, -0.0523522422, -0.1102614254, 0.1528646499, 0.0595665164, 0.0605414174, -0.0303194541, 0.0015065284, -0.0243969243, 0.0088777021, -0.1217652708, 0.0270535331, -0.0879849121, -0.0528396927, -0.0081404326, -0.1130886376, 0.1532546133, 0.0298563763, -0.1127961725, 0.0085974177, -0.0091701727, 0.0492812991, -0.0257617868, -0.0402634554, -0.0610288717, 0.1037295833, 0.0121131586, -0.0083658788, -0.0279309452, -0.0380942971, 0.0354620628, -0.086425066, -0.0104192663, 0.039678514, 0.0461616144, 0.0105106635, 0.0020229218, 0.0196686499, -0.0867662877, -0.0069583636, 0.0711191073, -0.0765785575, 0.0589815751, -0.033073552, 0.0625399649, -0.0731176585, -0.0121253449, -0.0014661613, 0.0861326009, 0.0968077779, -0.0903246775, 0.0315380804, -0.0825254619, -0.002420499, 0.038435515, 0.0870587528, -0.1224476993, 0.04937879, 0.0262004938, -0.0725814626, -0.0462347306, -0.1135760918, 0.0520597696, -0.0806244016, 0.0105411289, -0.104314521, 0.1981001049, 0.0594690256, -0.0090848692, 0.0692667961, 0.0649284795, -0.1388260573, 0.0845727548, 0.008573045, 0.051133614, -0.0681943968, -0.0308069065, 0.0778946728, -0.007074133, -0.0036528362, -0.0872537345, 0.0240069628, 0.0638073385, 0.0957841277, 0.138728559, -0.0026185261, -0.0203998256, 0.0271266513, 0.0521572605, -0.034828376, 0.0925669521, -0.0479651839, 0.0614675768, -0.0251768455, 0.0075433049, -0.0843290314, -0.0966127962, -0.0470633991, 0.0411896147, -0.0731664002, 0.0518160462, -0.0323180035, -0.1102614254, 0.0898859724, 0.0665370673, -0.0834028721, -0.0172192082, 0.1195229962, -0.006568403, 0.0558131449, 0.0337803587, 0.0469659083, -0.0008469462, 0.0477214567, -0.068681851, -0.0249087475, -0.0896909907, -0.0380699262, -0.0316843167, -0.0566418096, -0.0137339327, -0.0450892225, -0.0101328883, -0.1077266783, -0.0222399533, 0.0327810831, -0.0167561304, -0.0818917751, -0.0203998256, -0.023275787, 0.0809168741, 0.0339022204, -0.029003337, 0.0714603215, 0.0018462208, 0.003308574, -0.0938343257, 0.0280528069, 0.0034609025, -0.0268829241, 0.0325861014, -0.1286870688, -0.015427825, -0.0024189758, -0.0553256944, 0.0587865971, -0.0930544063, 0.0709241256, 0.0495250262, 0.023409836, 0.086571306, -0.1101639345, -0.0785771087, -0.0124421874, 0.0035096474, 0.0827691853, 0.0521572605, -0.0416283198, -0.0301975925, 0.0937368348, 0.0506461635, 0.0769685209, -0.0667807907, 0.0820380077, 0.021862179, 0.0277359635, -0.0329029448, -0.0118998988, 0.0843290314, 0.0737025961, 0.0847677365, 0.0144894822, -0.0495737717, -0.0714603215, 0.0179260112, 0.1060693488, 0.0097246487, 0.0596640073, 0.0466003194, -0.0367294364, 0.0098647904, -0.0115038445, -0.0665370673, -0.0178650804, -0.0104070799, 0.0215575229, 0.1452604085, 0.051133614, 0.0377043374, 0.0363638476, 0.020716669, 0.0727276951, 0.1239100546, 0.0314162187, 0.1151359379, 0.006940084, 0.0390935726, 0.0622474961, 0.0359251425, 0.0252499636, -0.0275897291, -0.0603951849, 0.0312699825, 0.0599077344, -0.0854989141, 0.0837440863, -0.1090915427, -0.0913970694, -0.0561543591, 0.0983676165, -0.0283452775, -0.001060206, -0.1070442498, -0.0488182232, -0.0121314377, 0.0685356185, -0.0415308289, 0.100707382, -0.0386548676, -0.0377774574, 0.035096474, -0.019571159, -0.0339753367, 0.0186693743 ]
801.4084
Igor Ivanov
I. P. Ivanov
Geometric methods for the most general Ginzburg-Landau model with two order parameters
4 pages, 1 figure
null
10.1103/PhysRevE.79.021116
null
cond-mat.supr-con
null
The Landau potential in the general Ginzburg-Landau theory with two order parameters and all possible quadratic and quartic terms cannot be minimized with the straightforward algebra. Here, a geometric approach is presented that circumvents this computational difficulty and allows one to get insight into many properties of the model in the mean-field approximation.
[ { "version": "v1", "created": "Sat, 26 Jan 2008 16:49:09 GMT" } ]
2013-05-29T00:00:00
[ [ "Ivanov", "I. P.", "" ] ]
[ -0.0723693594, 0.0020417317, -0.0454373844, -0.0098132947, 0.017207196, -0.0668932721, 0.0123566082, -0.0582070574, -0.0642024353, 0.0150946528, -0.0348392613, -0.0490487702, -0.0436907001, 0.0436907001, 0.0481518246, -0.0101201441, -0.0079957992, 0.0412595049, 0.0608978942, 0.0752018169, -0.0316999517, -0.0508898683, -0.0116130868, 0.0063730357, 0.0375064947, -0.0419204123, 0.0870509446, -0.0096480679, 0.1343530267, -0.0820469335, 0.124722667, -0.0001821921, -0.1714582592, -0.0697257295, -0.0449889116, 0.1098994613, 0.0556106381, 0.1272718757, -0.0427229404, 0.0761931837, 0.0653354153, 0.027168015, -0.1064060926, 0.0492376015, 0.0828494653, -0.0067683998, 0.0465939716, 0.0312042702, -0.0042309873, -0.0397252552, -0.0363263041, 0.0732190982, -0.041849602, -0.0766652599, 0.0386630818, -0.0072581796, -0.0285370369, 0.030047683, 0.0434782654, -0.0272860341, 0.0221640021, -0.1437001526, 0.0401973315, 0.0244063661, -0.0653354153, 0.0607562736, -0.0278053191, 0.0104978057, 0.0049450034, -0.0416135602, -0.1392626315, -0.1009299979, 0.0445168354, -0.0466883853, -0.0007195481, 0.042699337, -0.0253741238, 0.0125572402, -0.0309210252, 0.0424632989, -0.0279233381, 0.0045850449, 0.0443516076, 0.0220341813, -0.162205562, -0.034697637, -0.018009726, -0.0076122368, -0.0912996382, -0.0241703279, -0.0138908569, -0.0460038744, -0.0228603147, 0.0311098546, 0.1528584361, -0.0159443915, 0.1931737959, 0.0095831575, 0.015366097, 0.0135367997, 0.0069631315, 0.0652410015, 0.0704338476, -0.0276872981, 0.1119765937, -0.0079603931, 0.0048417365, -0.0074175051, 0.0091877934, -0.0007634365, 0.0413775221, 0.0187886525, -0.1052731052, 0.0464523472, -0.020724168, -0.0866732821, -0.0155195221, 0.0411178805, -0.0531558357, 0.0237336569, -0.0465467647, -0.1084832251, 0.0771373361, -0.0450833254, 0.054619275, -0.0448236838, 0.0379785709, -0.0940376818, -0.0079544922, 0.0682150871, -0.0000288363, 0.079072848, -0.051173117, -0.0432658307, -0.0689231977, -0.0619364642, 0.0407402217, 0.0385922715, 0.0355237722, -0.0922437906, 0.0244535729, 0.088183932, 0.009642167, -0.0050276169, 0.0812916085, 0.0843601078, -0.064344056, 0.031133458, 0.0158263724, 0.0072168726, 0.0976254642, 0.0088219335, 0.063022241, -0.1067837551, 0.030330928, -0.1106547788, 0.027970545, 0.0578293987, 0.0884199664, -0.0458150432, 0.0534390844, 0.051456362, -0.0105273109, -0.0262710694, 0.052778177, 0.1055563539, -0.1291601807, 0.007842374, -0.041495543, -0.0945569649, 0.0016434171, 0.0409526527, -0.0485294871, -0.0659019053, 0.0826134235, -0.0201104674, -0.0871453583, -0.0710947514, -0.0979087129, 0.0221049916, -0.0195557773, -0.0182339624, 0.0156257395, -0.0164754763, -0.0460746884, 0.0755794793, -0.0160152018, 0.005679673, -0.146154955, 0.0176674705, -0.0214676876, 0.1261388958, 0.0886560082, 0.153236106, 0.076995708, -0.0385450646, 0.0152126718, 0.0215857066, 0.0703866407, 0.1132039949, -0.0542888232, -0.0788840204, 0.042699337, -0.1369966567, -0.1420006752, 0.045697026, -0.0210900269, 0.0053964267, -0.0997026041, -0.0490959771, -0.0336590707, -0.002369235, 0.0644856766, 0.048859939, 0.0253741238, 0.0513147376, -0.1151867136, -0.0372232497, -0.000809169, 0.0920549557, -0.1036680415, -0.0000850107, -0.0510786995, 0.0405041799, 0.038214609, 0.0116484929, 0.048576694, -0.0260822382, -0.0129349018, 0.0327857286, 0.0498040915, -0.0445404388, -0.0668460652, 0.02264788, -0.0480338037, 0.0303073246, 0.061417181, 0.0902610645, -0.0552801825, -0.0683567077, -0.0178799052, 0.0586791337, -0.0417079777, -0.058820758, -0.0038592271, 0.0230373442, -0.0375537015, -0.0148350103, 0.0351697132, -0.0376245119, -0.1246282533, 0.0544776507, -0.0645800903, -0.0547136888, -0.1096162125, -0.0134069789 ]
801.4085
Nathan Mayne Mr
N.J. Mayne and Tim Naylor
Fitting the young main-sequence; distances, ages and age spreads
20 pages, 9 tables and 28 figures. Accepted for publication in MNRAS ref:MN-07-1360-MJ.R3
null
10.1111/j.1365-2966.2008.13025.x
null
astro-ph
null
We use several main-sequence models to derive distances (and extinctions), with statistically meaningful uncertainties for 11 star-forming-regions and young clusters. The model dependency is shown to be small, allowing us to adopt the distances derived using one model. Using these distances we have revised the age order for some of the clusters of Mayne et al (2007). The new (approximate) nominal ages are: 2 Myrs for NGC6530 and the ONC, 3 Myrs for Lambda Orionis, NGC2264 and Sigma Orionis, 4-5 Myrs for NGC2362, 13 Myrs for h and chi Per, 20 Myrs for NGC1960 and 40 Myrs for NGC2547. In cases of significantly variable extinction we have derived individual extinctions using a revised Q-method (Johnson and Morgan, 1953). These new data show that the largest remaining uncertainty in deriving an age ordering (and necessarily ages) is metallicity. We also discuss the use of a feature we term the R-C gap overlap to provide a diagnostic of isochronal age spreads or varying accretion histories within a given star-formation-region. Finally, recent derivations of the distance to the ONC lie in two groups. Our new more precise distance of 391(+12,-9) pc allows us to decisively reject the further distance, we adopt 400 pc as a convenient value.
[ { "version": "v1", "created": "Sat, 26 Jan 2008 17:17:02 GMT" } ]
2009-11-13T00:00:00
[ [ "Mayne", "N. J.", "" ], [ "Naylor", "Tim", "" ] ]
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801.4086
Anna Morozovska Nickolaevna
Anna N. Morozovska, Eugene A. Eliseev, George S. Svechnikov, Venkatraman Gopalan, and Sergei V. Kalinin
Effect of the Intrinsic Width on the Piezoelectric Force Microscopy of a Single Ferroelectric Domain Wall
25 pages, 5 figures, 3 tables, 3 Appendices, To be submitted to J. Appl. Phys
null
10.1063/1.2939369
null
cond-mat.mtrl-sci
null
Intrinsic domain wall width is a fundamental parameter that reflects bulk ferroelectric properties and governs the performance of ferroelectric memory devices. We present closed-form analytical expressions for vertical and lateral piezoelectric force microscopy (PFM) profiles for the conical and disc models of the tip, beyond point charge and sphere approximations. The analysis takes into account the finite intrinsic width of the domain wall, and dielectric anisotropy of the material. These analytical expressions provide insight into the mechanisms of PFM image formation and can be used for quantitative analysis of the PFM domain wall profiles. PFM profile of a realistic domain wall is shown to be the convolution of its intrinsic profile and resolution function of PFM.
[ { "version": "v1", "created": "Sat, 26 Jan 2008 17:23:01 GMT" } ]
2009-11-13T00:00:00
[ [ "Morozovska", "Anna N.", "" ], [ "Eliseev", "Eugene A.", "" ], [ "Svechnikov", "George S.", "" ], [ "Gopalan", "Venkatraman", "" ], [ "Kalinin", "Sergei V.", "" ] ]
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801.4087
Bhupendra Nath Tiwari
Bhupendra Nath Tiwari
Sur les corrections de la g\'eom\'etrie thermodynamique des trous noirs
489 pages, Latex, French, English Abstract
null
null
null
hep-th math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study thermodynamic geometry of certain black holes and black branes with and without generalized uncertainty principle or stringy $ \alpha^{\prime} $-corrections to the entropy. From this perspective, we analyze Ruppenier geometry of Reissner-Nordstr\"om black holes and show that it is well defined and corresponds to a non-interacting statistical system. We investigate that the Weinhold geometry of dilatonic black holes is regular everywhere and that of large mass Reissner-Nordstr\"om black holes in the Poincar\'e patch of $ AdS_4 $ contains certain narrow range of thermodynamically unstable regions in the statespace. We obtain that the generalized uncertainty principle corrected Ruppenier geometry of Reissner-Nordstr\"om black holes correspond to a non-interacting statistical system unlike the magnetically charged black holes. We show that the stringy $ \alpha^{\prime} $-corrections do not introduce singularity in the statespace geometry of non-supersymmetric extremal black holes in $ D= 4 $. Interestingly, the degree of scalar curvature and that of the determinant of this Ruppenier geometry can be written as an integer multiple of the order of $ \alpha^{\prime} $-correction. We further show that the statespace geometry of Gauss- Bonnet corrected supersymmetric extremal black holes in $ D=4 $ as well as non-extremal $D_1D_5$ and $D_2D_6NS_5$ black branes in $ D=10 $ is regular everywhere. Furthermore, the thermodynamic geometry of four dimensional rotating Kerr-Newman extremal black holes in Einstein-Maxwell theory is everywhere ill-defined and that of the Kaluza-Klein black holes in Einstein-Maxwell theory or the one arrising from heterotic string compactification is ill-defined only at the points of the ergo-branch.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 04:32:24 GMT" }, { "version": "v2", "created": "Tue, 23 Aug 2011 17:24:31 GMT" } ]
2011-08-24T00:00:00
[ [ "Tiwari", "Bhupendra Nath", "" ] ]
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801.4088
Frederic Bernicot
Frederic Bernicot (LM-Orsay)
Local estimates and global continuities in Lebesgue spaces for bilinear operators
37 pages
null
null
null
math.FA math.CA
null
In this paper, we first prove some local estimates for bilinear operators (closely related to the bilinear Hilbert transform and similar singular operators) with truncated symbol. Such estimates, in accordance with the Heisenberg uncertainty principle correspond to a description of ``off-diagonal'' decay. In addition they allow us to prove global continuities in Lebesgue spaces for bilinear operators with spatial dependent symbol.
[ { "version": "v1", "created": "Sat, 26 Jan 2008 17:40:12 GMT" }, { "version": "v2", "created": "Tue, 5 Feb 2008 20:05:17 GMT" }, { "version": "v3", "created": "Fri, 8 Feb 2008 07:08:50 GMT" } ]
2008-02-08T00:00:00
[ [ "Bernicot", "Frederic", "", "LM-Orsay" ] ]
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801.4089
Jose B. Almeida
Jose B. Almeida
How much in the Universe can be explained by geometry?
15 pages. Oral presentation at Astroparticle Montpelier Toulouse 2007
null
null
null
physics.gen-ph
null
The paper uses geometrical arguments to derive equations with relevance for cosmology; 5-dimensional spacetime is assumed because it has been shown in other works to provide a setting for significant unification of different areas of physics. Monogenic functions, which zero the vector derivative are shown to effectively model electrodynamics and relativistic dynamics if one allows for space curvature. Applying monogenic functions to flat space, the Hubble relation can be derived straightforwardly as a purely geometrical effect. Consideration of space curvature induced by mass density allows the derivation of flat rotation curves for galaxies without appealing for dark matter. Similarly, a small overall mass density in the Universe is shown to provide a possible explanation for recent supernovae observations, without the need for a cosmological constant.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 16:30:58 GMT" } ]
2008-01-29T00:00:00
[ [ "Almeida", "Jose B.", "" ] ]
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801.409
Jonathan Middleton
Jonathan Middleton and John D. Barrow
The Stability of an Isotropic Cosmological Singularity in Higher-Order Gravity
25 pages
Phys.Rev.D77:103523,2008
10.1103/PhysRevD.77.103523
null
gr-qc astro-ph hep-th
null
We study the stability of the isotropic vacuum Friedmann universe in gravity theories with higher-order curvature terms of the form $(R_{ab}R^{ab})^{n}$ added to the Einstein-Hilbert Lagrangian of general relativity on approach to an initial cosmological singularity. Earlier, we had shown that, when $% n=1$, a special isotropic vacuum solution exists which behaves like the radiation-dominated Friedmann universe and is stable to anisotropic and small inhomogeneous perturbations of scalar, vector and tensor type. This is completely different to the situation that holds in general relativity, where an isotropic initial cosmological singularity is unstable in vacuum and under a wide range of non-vacuum conditions. We show that when $n\neq 1$, although a special isotropic vacuum solution found by Clifton and Barrow always exists, it is no longer stable when the initial singularity is approached. We find the particular stability conditions under the influence of tensor, vector, and scalar perturbations for general $n$ for both solution branches. On approach to the initial singularity, the isotropic vacuum solution with scale factor $a(t)=t^{P_{-}/3}$ is found to be stable to tensor perturbations for $0.5<n< 1.1309$ and stable to vector perturbations for $0.861425 < n \leq 1$, but is unstable as $t \to 0$ otherwise. The solution with scale factor $a(t)=t^{P_{+}/3}$ is not relevant to the case of an initial singularity for $n>1$ and is unstable as $t \to 0$ for all $n$ for each type of perturbation.
[ { "version": "v1", "created": "Sat, 26 Jan 2008 18:00:34 GMT" } ]
2008-11-26T00:00:00
[ [ "Middleton", "Jonathan", "" ], [ "Barrow", "John D.", "" ] ]
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801.4091
Maria Alonso V
M. Victoria Alonso, Georgina V. Coldwell, Ilona Sochting, Carlos Bornancini, Malcolm G. Smith, Diego Garcia Lambas, Armin Rest
Triplets of Quasars at high redshift I: Photometric data
The paper contains 12 figures and 3 tables
null
10.1111/j.1365-2966.2008.13004.x
null
astro-ph
null
We have conducted an optical and infrared imaging in the neighbourhoods of 4 triplets of quasars. R, z', J and Ks images were obtained with MOSAIC II and ISPI at Cerro Tololo Interamerican Observatory. Accurate relative photometry and astrometry were obtained from these images for subsequent use in deriving photometric redshifts. We analyzed the homogeneity and depth of the photometric catalog by comparing with results coming from the literature. The good agreement shows that our magnitudes are reliable to study large scale structure reaching limiting magnitudes of R = 24.5, z' = 22.5, J = 20.5 and Ks = 19.0. With this catalog we can study the neighbourhoods of the triplets of quasars searching for galaxy overdensities such as groups and galaxy clusters.
[ { "version": "v1", "created": "Sat, 26 Jan 2008 18:05:02 GMT" } ]
2009-11-13T00:00:00
[ [ "Alonso", "M. Victoria", "" ], [ "Coldwell", "Georgina V.", "" ], [ "Sochting", "Ilona", "" ], [ "Bornancini", "Carlos", "" ], [ "Smith", "Malcolm G.", "" ], [ "Lambas", "Diego Garcia", "" ], [ "Rest", "Armin", "" ] ]
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801.4092
Allen Knutson
Allen Knutson
A compactly supported formula for equivariant localization, and, simplicial complexes of Bialynicki-Birula decompositions
30 pages, 6 figures
Pure and Applied Mathematics Quarterly Vol 6, #2, April 2010, p. 501-544
null
null
math.AG math.SG
null
Let X be a projective scheme carrying a circle action S with isolated fixed points. We associate a simplicial complex Delta(X,S) of "closure chains" using a refinement of its Morse/Bialynicki-Birula decomposition. If this decomposition is a stratification (e.g. when X is a flag manifold), then Delta(X,S) is just the order complex of the poset of fixed points. For X a toric variety, Delta(X,S) is a triangulation of the moment polytope. We compute some other examples, including a Bott-Samelson manifold and the punctual Hilbert scheme of 4 points in the plane. Summing over the facets of Delta(X,S), we obtain a positive formula for the Duistermaat-Heckman measure on the moment polytope of X, defined for any torus action extending S. We explain how, through brutal use of partial fractions, this can be extended to an AB/BV-type formula for integrating general classes. Throughout we work with equivariant Chow groups, and do not make any smoothness requirements on X.
[ { "version": "v1", "created": "Sat, 26 Jan 2008 18:12:51 GMT" } ]
2010-04-26T00:00:00
[ [ "Knutson", "Allen", "" ] ]
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801.4093
Brian Hart
Brian C. Hart
Evolution of Substructure in Galaxy Clusters as Observed in X-Rays
PhD Thesis, 180 pages, 25 figures, LaTeX
null
null
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Clusters of galaxies are the largest gravitationally-bound objects in the Universe, having diameters on order of Mpc. Our work asked whether their shapes (morphologies) change over time as the Universe ages. We observed a sample of 165 galaxy clusters, at 0.1 < z < 1.3. A variety of measures were used to quantify the shapes of galaxy clusters. Archive observations from the Chandra X-Ray Observatory were used. Morphology evolution was probed at two different distances from clusters' centers -- 300 kpc and 500 kpc -- for comparison. In almost all cases, we were able to rule out that clusters retain their morphology over the history of the Universe, which is in agreement with our current picture of large-scale structure formation. In addition, we found that ellipticities, as a means of quantifying morphologies, are of limited use in studies such as this work.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 03:08:56 GMT" }, { "version": "v2", "created": "Mon, 28 Jan 2008 22:34:19 GMT" }, { "version": "v3", "created": "Sun, 23 Mar 2008 05:36:32 GMT" }, { "version": "v4", "created": "Wed, 22 Oct 2008 23:49:27 GMT" } ]
2008-10-23T00:00:00
[ [ "Hart", "Brian C.", "" ] ]
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801.4094
Masaharu Isobe
Masaharu Isobe
Long Time Tail of the Velocity Autocorrelation Function in a Two-Dimensional Moderately Dense Hard Disk Fluid
5 pages, 5 figures, to appear in Phys. Rev. E
Phys. Rev. E 77, 021201 (2008)
10.1103/PhysRevE.77.021201
null
cond-mat.stat-mech
null
Alder and Wainwright discovered the slow power decay $\sim t^{-d/2}$ ($d$:dimension) of the velocity autocorrelation function in moderately dense hard sphere fluids using the event-driven molecular dynamics simulations. In the two-dimensional case, the diffusion coefficient derived using the time correlation expression in linear response theory shows logarithmic divergence, which is called the ``2D long-time-tail problem''. We revisited this problem to perform a large-scale, long-time simulation with one million hard disks using a modern efficient algorithm and found that the decay of the long tail in moderately dense fluids is slightly faster than the power decay ($\sim 1/t$). We also compared our numerical data with the prediction of the self-consistent mode-coupling theory in the long time limit ($\sim 1/(t\sqrt{\ln{t}})$).
[ { "version": "v1", "created": "Sat, 26 Jan 2008 19:44:12 GMT" } ]
2008-05-05T00:00:00
[ [ "Isobe", "Masaharu", "" ] ]
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801.4095
Marc-Henri Julien
M.-H. Julien, C. de Vaulx, H. Mayaffre, C. Berthier, M. Horvatic, V. Simonet, J. Wooldridge, G. Balakrishnan, M.R. Lees, D.P. Chen, C.T. Lin, P. Lejay
Electronic texture of the thermoelectric oxide Na0.75CoO2
4 pages, to appear in Phys. Rev. Lett
Phys. Rev. Lett. 100, 096405 (2008)
10.1103/PhysRevLett.100.096405
null
cond-mat.str-el
null
From 59Co and 23Na NMR, we demonstrate the impact of the Na+ vacancy ordering on the cobalt electronic states in Na0.75CoO2: at long time scales, there is neither a disproportionation into 75 % Co3+ and 25 % Co4+ states, nor a mixed-valence metal with a uniform Co3.25+ state. Instead, the system adopts an intermediate configuration in which 30 % of the lattice sites form an ordered pattern of localized Co3+ states. Above 180 K, an anomalous mobility of specific Na+ sites is found to coexist with this electronic texture, suggesting that the formation of the latter may contribute to stabilizing the Na+ ordering. Control of the ion doping in these materials thus appears to be crucial for fine-tuning of their thermoelectric properties.
[ { "version": "v1", "created": "Sat, 26 Jan 2008 20:32:15 GMT" } ]
2008-03-06T00:00:00
[ [ "Julien", "M. -H.", "" ], [ "de Vaulx", "C.", "" ], [ "Mayaffre", "H.", "" ], [ "Berthier", "C.", "" ], [ "Horvatic", "M.", "" ], [ "Simonet", "V.", "" ], [ "Wooldridge", "J.", "" ], [ "Balakrishnan", "G.", "" ], [ "Lees", "M. R.", "" ], [ "Chen", "D. P.", "" ], [ "Lin", "C. T.", "" ], [ "Lejay", "P.", "" ] ]
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801.4096
Volker Dohm
Volker Dohm
Diversity of critical behavior within a universality class
null
Physical Review E 77, 061128 (2008)
10.1103/PhysRevE.77.061128
null
cond-mat.stat-mech
null
We study spatial anisotropy effects on the bulk and finite-size critical behavior of the O$(n)$ symmetric anisotropic $\phi^4$ lattice model with periodic boundary conditions in a $d$-dimensional hypercubic geometry above, at and below $T_c$. The absence of two-scale factor universality is discussed for the bulk order-parameter correlation function, the bulk scattering intensity, and for several universal bulk amplitude relations. For the confined system, renormalization-group theory within the minimal subtraction scheme at fixed dimension $d$ for $2<d<4$ is employed. For the case of cubic symmetry and for $n=1$ our perturbation approach yields excellent agreement with the Monte Carlo (MC) data for the finite-size amplitude of the free energy of the three-dimensional Ising model at $T_c$ by Mon [Phys. Rev. Lett. {\bf 54}, 2671 (1985)]. Below $T_c$ a minimum of the scaling function of the excess free energy is found. We predict a measurable dependence of this minimum on the anisotropy parameters. The relative anisotropy effect on the free energy is predicted to be significantly larger than that on the Binder cumulant. Our theory agrees quantitatively with the non-monotonic dependence of the Binder cumulant on the ferromagnetic next-nearest neighbor (NNN) coupling of the two-dimensional Ising model found by MC simulations of Selke and Shchur [J. Phys. {\bf A 38}, L739 (2005)]. Our theory also predicts a non-monotonic dependence for small values of the {\it antiferromagnetic} NNN coupling and the existence of a Lifschitz point at a larger value of this coupling. The nonuniversal anisotropy effects in the finite-size scaling regime are predicted to satisfy a kind of restricted universality. The tails of the large-$L$ behavior at $T \neq T_c$ violate both finite-size scaling and universality.
[ { "version": "v1", "created": "Sat, 26 Jan 2008 20:25:35 GMT" }, { "version": "v2", "created": "Thu, 15 May 2008 18:41:35 GMT" } ]
2009-11-13T00:00:00
[ [ "Dohm", "Volker", "" ] ]
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801.4097
Andrew Corrigan
Andrew Corrigan, John Wallin, Thomas Wanner
A sampling inequality for fractional order Sobolev semi-norms using arbitrary order data
v3. fixes typos, notation, wording. v2. 14 pages, major conceptual changes
null
null
null
math.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
To improve convergence results obtained using a framework for unsymmetric meshless methods due to Schaback (Preprint G\"ottingen 2006), we extend, in two directions, the Sobolev bound due to Arcang\'eli et al. (Numer Math 107, 181-211, 2007), which itself extends two others due to Wendland and Rieger (Numer Math 101, 643-662, 2005) and Madych (J. Approx Theory 142, 116-128, 2006). The first is to incorporate discrete samples of arbitrary order derivatives into the bound, which are used to obtain higher order convergence in higher order Sobolev norms. The second is to optimally bound fractional order Sobolev semi-norms, which are used to obtain more optimal convergence rates when solving problems requiring fractional order Sobolev spaces, notably inhomogeneous boundary value problems.
[ { "version": "v1", "created": "Sat, 26 Jan 2008 20:35:13 GMT" }, { "version": "v2", "created": "Tue, 2 Dec 2008 14:32:32 GMT" }, { "version": "v3", "created": "Wed, 13 May 2009 22:05:39 GMT" } ]
2009-05-14T00:00:00
[ [ "Corrigan", "Andrew", "" ], [ "Wallin", "John", "" ], [ "Wanner", "Thomas", "" ] ]
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801.4098
Jae-Seung Lee
Jae-Seung Lee and A. K. Khitrin
Experimental Implementation of Projective Measurement in Bell Basis
10 pages, 3 figures, submitted
J. Magn. Reson. 198, 248-251 (2009)
10.1016/j.jmr.2009.02.013
null
quant-ph
null
A scheme for direct projection of a quantum state on Bell states is described. The method is based on constructing an average Hamiltonian with Bell eigenstates and then, projecting the state on these eigenstates. The projection is performed by adding the results of a direct and time-reversed evolution. Experimental demonstration is shown for pairs of dipolar-coupled nuclear spins.
[ { "version": "v1", "created": "Sat, 26 Jan 2008 21:03:34 GMT" } ]
2009-08-11T00:00:00
[ [ "Lee", "Jae-Seung", "" ], [ "Khitrin", "A. K.", "" ] ]
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801.4099
Johannes Huebschmann
Johannes Huebschmann, Matthew Perlmutter, Tudor S. Ratiu
Extensions of Lie-Rinehart algebras and cotangent bundle reduction
The original version has been reworked and expanded with coauthors. The new version has 30 pages; it will appear in the Proceedings of the London Mathematical Society
Proceedings of the London Mathematical Society 107 (2013), 1135-1172
10.1112/plms/pdt030
null
math.SG math.DG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let Q denote a smooth manifold acted upon smoothly by a Lie group G. The G-action lifts to an action on the total space T of the cotangent bundle of Q and hence on the standard symplectic Poisson algebra of smooth functions on T. The Poisson algebra of G-invariant functions on T yields a Poisson structure on the space T/G of G-orbits. We relate this Poisson algebra with extensions of Lie-Rinehart algebras and derive an explicit formula for this Poisson structure in terms of differentials. We then show, for the particular case where the G-action on Q is principal, how an explicit description of the Poisson algebra derived in the literature by an ad hoc construction is essentially a special case of the formula for the corresponding extension of Lie-Rinehart algebras. By means of various examples, we also show that this kind of description breaks down when the G-action does not define a principal bundle.
[ { "version": "v1", "created": "Sat, 26 Jan 2008 21:19:57 GMT" }, { "version": "v2", "created": "Wed, 13 Mar 2013 22:08:26 GMT" } ]
2013-11-05T00:00:00
[ [ "Huebschmann", "Johannes", "" ], [ "Perlmutter", "Matthew", "" ], [ "Ratiu", "Tudor S.", "" ] ]
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801.41
Erika Andersson
Erika Andersson, Jim D. Cresser, Michael J. W. Hall
Finding the Kraus decomposition from a master equation and vice versa
16 pages, no figures. Appeared in special issue for conference QEP-16, Manchester 4-7 Sep 2006
J Mod. Opt. 54, 1695 (2007)
10.1080/09500340701352581
null
quant-ph
null
For any master equation which is local in time, whether Markovian, non-Markovian, of Lindblad form or not, a general procedure is reviewed for constructing the corresponding linear map from the initial state to the state at time t, including its Kraus-type representations. Formally, this is equivalent to solving the master equation. For an N-dimensional Hilbert space it requires (i) solving a first order N^2 x N^2 matrix time evolution (to obtain the completely positive map), and (ii) diagonalising a related N^2 x N^2 matrix (to obtain a Kraus-type representation). Conversely, for a given time-dependent linear map, a necessary and sufficient condition is given for the existence of a corresponding master equation, where the (not necessarily unique) form of this equation is explicitly determined. It is shown that a `best possible' master equation may always be defined, for approximating the evolution in the case that no exact master equation exists. Examples involving qubits are given.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 11:19:06 GMT" } ]
2008-01-29T00:00:00
[ [ "Andersson", "Erika", "" ], [ "Cresser", "Jim D.", "" ], [ "Hall", "Michael J. W.", "" ] ]
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801.4101
Arthur Hebecker
Arthur Hebecker, John March-Russell, Robert Ziegler
Inducing the mu and the B mu Term by the Radion and the 5d Chern-Simons Term
23 pages, LaTeX, 1 figure, concrete model significantly improved, references added
JHEP 0908:064,2009
10.1088/1126-6708/2009/08/064
HD-THEP-08-6, OUTP-08-02P
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In 5-dimensional models with gauge-Higgs unification, the F-term vacuum expectation value of the radion provides, in close analogy to the Giudice-Masiero mechanism, a natural source for the mu and B mu term. Both the leading order gauge theory lagrangian and the supersymmetric Chern-Simons term contain couplings to the radion superfield which can be used for this purpose. We analyse the basic features of this mechanism for mu term generation and provide an explicit example, based on a variation of the SU(6) gauge-Higgs unification model of Burdman and Nomura. This construction contains all the relevant features used in our generic analysis. More generally, we expect our mechanism to be relevant to many of the recently discussed orbifold GUT models derived from heterotic string theory. This provides an interesting way of testing high-scale physics via Higgs mass patterns accessible at the LHC.
[ { "version": "v1", "created": "Sat, 26 Jan 2008 22:10:42 GMT" }, { "version": "v2", "created": "Fri, 7 Mar 2008 19:48:23 GMT" }, { "version": "v3", "created": "Thu, 25 Jun 2009 17:25:15 GMT" } ]
2009-08-24T00:00:00
[ [ "Hebecker", "Arthur", "" ], [ "March-Russell", "John", "" ], [ "Ziegler", "Robert", "" ] ]
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801.4102
Paolo Piccione
Pierluigi Benevieri, Paolo Piccione
On a formula for the spectral flow and its applications
28 pages
null
null
null
math.FA math.DG
null
We consider a continuous path of bounded symmetric Fredholm bilinear forms with arbitrary endpoints on a real Hilbert space, and we prove a formula that gives the spectral flow of the path in terms of the spectral flow of the restriction to a finite codimensional closed subspace. We also discuss the case of restrictions to a continuous path of finite codimensional closed subspaces. As an application of the formula, we introduce the notion of spectral flow for a periodic semi-Riemannian geodesic, and we compute its value in terms of the Maslov index.
[ { "version": "v1", "created": "Sat, 26 Jan 2008 22:17:26 GMT" } ]
2008-01-29T00:00:00
[ [ "Benevieri", "Pierluigi", "" ], [ "Piccione", "Paolo", "" ] ]
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801.4103
Maximo Banados
Maximo Banados
Eddington-Born-Infeld action for dark energy and dark matter
A sign mistake in section on galactic scales is pointed out. This sign invalidates the content of that section. See comment on manuscript
Phys.Rev.D77:123534,2008
10.1103/PhysRevD.77.123534
null
hep-th astro-ph gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We argue that Einstein gravity coupled to a Born-Infeld theory provides an attractive candidate to represent dark matter and dark energy. For cosmological models, the Born-Infeld field has an equation of state which interpolates between matter, w=0 (small times), and a cosmological constant w=-1 (large times). On galactic scales, the Born-Infeld field predicts asymptotically flat rotation curves.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 15:08:54 GMT" }, { "version": "v2", "created": "Tue, 29 Jan 2008 14:41:03 GMT" }, { "version": "v3", "created": "Mon, 10 Mar 2008 20:07:10 GMT" }, { "version": "v4", "created": "Fri, 27 Jun 2008 19:36:12 GMT" }, { "version": "v5", "created": "Fri, 8 Mar 2013 19:18:47 GMT" } ]
2013-03-11T00:00:00
[ [ "Banados", "Maximo", "" ] ]
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801.4104
Gregory Berkolaiko
G. Berkolaiko and B. Winn
Relationship between scattering matrix and spectrum of quantum graphs
19 pages, 3 figures; substituted a proof for a reference to a published one, other minor updates
Trans. Amer. Math. Soc. 362 (2010), 6261-6277
10.1090/S0002-9947-2010-04897-4
null
math-ph math.MP
null
We investigate the equivalence between spectral characteristics of the Laplace operator on a metric graph, and the associated unitary scattering operator. We prove that the statistics of level spacings, and moments of observations in the eigenbases coincide in the limit that all bond lengths approach a positive constant value.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 14:45:04 GMT" }, { "version": "v2", "created": "Fri, 21 Mar 2008 04:57:14 GMT" } ]
2011-10-19T00:00:00
[ [ "Berkolaiko", "G.", "" ], [ "Winn", "B.", "" ] ]
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801.4105
Steven Perron
Steven Perron (University of Toronto)
Quantified Propositional Logspace Reasoning
28 pages
null
null
null
cs.LO cs.CC
null
In this paper, we develop a quantified propositional proof systems that corresponds to logarithmic-space reasoning. We begin by defining a class SigmaCNF(2) of quantified formulas that can be evaluated in log space. Then our new proof system GL^* is defined as G_1^* with cuts restricted to SigmaCNF(2) formulas and no cut formula that is not quantifier free contains a free variable that does not appear in the final formula. To show that GL^* is strong enough to capture log space reasoning, we translate theorems of VL into a family of tautologies that have polynomial-size GL^* proofs. VL is a theory of bounded arithmetic that is known to correspond to logarithmic-space reasoning. To do the translation, we find an appropriate axiomatization of VL, and put VL proofs into a new normal form. To show that GL^* is not too strong, we prove the soundness of GL^* in such a way that it can be formalized in VL. This is done by giving a logarithmic-space algorithm that witnesses GL^* proofs.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 19:53:39 GMT" } ]
2008-01-29T00:00:00
[ [ "Perron", "Steven", "", "University of Toronto" ] ]
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801.4106
Paul M. Bellan
P. M. Bellan
Enrichment of the dust-to-gas mass ratio in Bondi/Jeans accretion/cloud systems due to unequal changes in dust and gas incoming velocities
26 pages, 2 figures
null
10.1086/533483
null
astro-ph
null
The ratio of the Bondi and Jeans lengths is used to develop a cloud-accretion model that describes both an inner Bondi-type regime where gas pressure is balanced by the gravity of a central star and an outer Jeans-type regime where gas pressure is balanced by gas self-gravity. The gas density profile provided by this model makes a smooth transition from a wind-type inner solution to a Bonnor-Ebert type outer solution. It is shown that high-velocity dust impinging on this cloud will tend to pile-up due to having a different velocity profile than gas so that the dust-to-gas ratio is substantially enriched above the 1% ISM level.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 00:23:02 GMT" } ]
2009-11-13T00:00:00
[ [ "Bellan", "P. M.", "" ] ]
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801.4107
Craig Antonio Pastro
Brian Day and Craig Pastro
Note on Frobenius monoidal functors
8 pages; added new material
New York Journal of Mathematics 14 (2008) 733-742
null
null
math.CT
null
It is well known that strong monoidal functors preserve duals. In this short note we show that a slightly weaker version of functor, which we call "Frobenius monoidal", is sufficient.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 00:31:36 GMT" }, { "version": "v2", "created": "Fri, 18 Apr 2008 06:34:42 GMT" } ]
2010-03-03T00:00:00
[ [ "Day", "Brian", "" ], [ "Pastro", "Craig", "" ] ]
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801.4108
Kazunori Kohri
Eung Jin Chun (KIAS), Hang Bae Kim (Hanyang Univ.), Kazunori Kohri (Lancaster), David H. Lyth (Lancaster)
Flaxino dark matter and stau decay
9 pages, 4 figures, to appear in JHEP
JHEP0803:061,2008
10.1088/1126-6708/2008/03/061
null
hep-ph astro-ph
null
If the spontaneous breaking of Peccei-Quinn symmetry comes from soft supersymmetry breaking, the fermionic partners of the symmetry-breaking fields have mass of order the gravitino mass, and are called flatinos. The lightest flatino, called here the flaxino, is a CDM candidate if it is the lightest supersymmetric particle. We here explore flaxino dark matter assuming that the lightest ordinary supersymmetric particle is the stau, with gravity-mediated supersymmetry breaking. The decay of the stau to the flaxino is fast enough not to spoil the standard predictions of Big Bang Nucleosynthesis, and its track and decay can be seen in future colliders.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 17:32:14 GMT" }, { "version": "v2", "created": "Thu, 20 Mar 2008 15:07:16 GMT" } ]
2008-11-26T00:00:00
[ [ "Chun", "Eung Jin", "", "KIAS" ], [ "Kim", "Hang Bae", "", "Hanyang Univ." ], [ "Kohri", "Kazunori", "", "Lancaster" ], [ "Lyth", "David H.", "", "Lancaster" ] ]
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801.4109
Juan Garcia-Bellido
Juan Garcia-Bellido and Daniel G. Figueroa
A new gravitational wave background from the Big Bang
20 pages, 8 figures, to appear in the Proceedings of JGRG17, Nagoya (Japan), 3-7 December 2007
null
null
IFT-UAM/CSIC-08-05
gr-qc astro-ph hep-ph
null
The reheating of the universe after hybrid inflation proceeds through the nucleation and subsequent collision of large concentrations of energy density in the form of bubble-like structures moving at relativistic speeds. This generates a significant fraction of energy in the form of a stochastic background of gravitational waves, whose time evolution is determined by the successive stages of reheating: First, tachyonic preheating makes the amplitude of gravity waves grow exponentially fast. Second, bubble collisions add a new burst of gravitational radiation. Third, turbulent motions finally sets the end of gravitational waves production. From then on, these waves propagate unimpeded to us. We find that the fraction of energy density today in these primordial gravitational waves could be significant for GUT scale models of inflation, although well beyond the frequency range sensitivity of gravitational wave observatories like LIGO, LISA or BBO. However, low-scale models could still produce a detectable signal at frequencies accessible to BBO or DECIGO. For comparison, we have also computed the analogous background from some chaotic inflation models and obtained similar results to those of other groups. The discovery of such a background would open a new observational window into the very early universe, where the details of the process of reheating could be explored. Thus, it could also serve as a new experimental tool for testing the Inflationary Paradigm.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 01:46:00 GMT" } ]
2008-01-29T00:00:00
[ [ "Garcia-Bellido", "Juan", "" ], [ "Figueroa", "Daniel G.", "" ] ]
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801.411
Keith R. Dienes
Sky Bauman, Keith R. Dienes
New Regulators for Quantum Field Theories with Compactified Extra Dimensions. II: Ultraviolet Finiteness and Effective Field Theory Implementation
24 pages, LaTeX, 1 figure
Phys.Rev.D77:125006,2008
10.1103/PhysRevD.77.125006
null
hep-th
null
In a previous companion paper [arXiv:0712.3532], we proposed two new regulators for quantum field theories in spacetimes with compactified extra dimensions. Unlike most other regulators which have been used in the extra-dimension literature, these regulators are specifically designed to respect the original higher-dimensional Lorentz and gauge symmetries that exist prior to compactification, and not merely the four-dimensional symmetries which remain afterward. In this paper, we use these regulators in order to develop a method for extracting ultraviolet-finite results from one-loop calculations. This method also allows us to derive Wilsonian effective field theories for Kaluza-Klein modes at different energy scales. Our method operates by ensuring that divergent corrections to parameters describing the physics of the excited Kaluza-Klein modes are absorbed into the corresponding parameters for zero modes, thereby eliminating the need to introduce independent counterterms for parameters characterizing different Kaluza-Klein modes. Our effective field theories can therefore simplify calculations involving Kaluza-Klein modes, and be compared directly to potential experimental results emerging from collider data.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 03:33:10 GMT" } ]
2008-11-26T00:00:00
[ [ "Bauman", "Sky", "" ], [ "Dienes", "Keith R.", "" ] ]
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801.4111
Alexander Velytsky
Alexander Velytsky
Entanglement entropy in d+1 SU(N) gauge theory
9 pages, 5 figures, revised version: one figure added, discussion of the results extended, misprints corrected
Phys.Rev.D77:085021,2008
10.1103/PhysRevD.77.085021
ANL-HEP-PR-08-06
hep-th cond-mat.stat-mech hep-lat
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the entanglement entropy for a sub-system in d+1 dimensional SU(N) lattice gauge theory. The 1+1 gauge theory is treated exactly and shows trivial behavior. Gauge theories in higher dimensions are treated within Migdal-Kadanoff approximation. We consider the gauge theory in the confinement phase. We demonstrate the existence of a non-analytical change from the short distance to long distance form in the entanglement entropy in such systems (d>2) reminiscent of a phase transition. The transition is manifested in nontrivial change in the RG flow of the character expansion coefficients defining the partition function.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 03:36:13 GMT" }, { "version": "v2", "created": "Tue, 17 Jun 2008 21:52:02 GMT" } ]
2008-11-26T00:00:00
[ [ "Velytsky", "Alexander", "" ] ]
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801.4112
Ahmad Sheykhi
Ahmad Sheykhi
Thermodynamical properties of topological Born-Infeld-dilaton black holes
18 pages, 15 figures; IJMPD (2008) to appear
Int.J.Mod.Phys.D18:25-42,2009
10.1142/S021827180901425X
null
hep-th
null
We examine the $(n+1)$-dimensional $(n\geq3)$ action in which gravity is coupled to the Born-Infeld nonlinear electrodynamic and a dilaton field. We construct a new $(n+1)$-dimensional analytic solution of this theory in the presence of Liouville-type dilaton potentials. These solutions which describe charged topological dilaton black holes with nonlinear electrodynamics, have unusual asymptotics. They are neither asymptotically flat nor (anti)-de Sitter. The event horizons of these black holes can be an $(n-1)$-dimensional positive, zero or negative constant curvature hypersurface. We also analyze thermodynamics and stability of these solutions and disclose the effect of the dilaton and Born-Infeld fields on the thermal stability in the canonical ensemble.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 04:01:57 GMT" } ]
2009-03-24T00:00:00
[ [ "Sheykhi", "Ahmad", "" ] ]
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801.4113
Walter Whiteley
Brigitte Servatius, Offer Shai, Walter Whiteley
Geometric Properties of Assur Graphs
null
null
null
null
math.MG math.CO
null
In our previous paper, we presented the combinatorial theory for minimal isostatic pinned frameworks - Assur graphs - which arise in the analysis of mechanical linkages. In this paper we further explore the geometric properties of Assur graphs, with a focus on singular realizations which have static self-stresses. We provide a new geometric characterization of Assur graphs, based on special singular realizations. These singular positions are then related to dead-end positions in which an associated mechanism with an inserted driver will stop or jam.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 04:22:13 GMT" } ]
2016-09-08T00:00:00
[ [ "Servatius", "Brigitte", "" ], [ "Shai", "Offer", "" ], [ "Whiteley", "Walter", "" ] ]
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801.4114
Allen Knutson
Allen Knutson
Schubert patches degenerate to subword complexes
11 pages
Transformation Groups, Volume 13, Numbers 3-4 / December, 2008
null
null
math.AG math.CO
null
We study the intersections of general Schubert varieties X_w with permuted big cells, and give an inductive degeneration of each such "Schubert patch" to a Stanley-Reisner scheme. Similar results had been known for Schubert patches in various types of Grassmannians. We maintain reducedness using the results of [Knutson 2007] on automatically reduced degenerations, or through more standard cohomology-vanishing arguments. The underlying simplicial complex of the Stanley-Reisner scheme is a subword complex, as introduced for slightly different purposes in [Knutson-Miller 2004], and is homeomorphic to a ball. This gives a new proof of the Andersen-Jantzen-Soergel/Billey and Graham/Willems formulae for restrictions of equivariant Schubert classes to fixed points.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 04:54:11 GMT" } ]
2010-04-26T00:00:00
[ [ "Knutson", "Allen", "" ] ]
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801.4115
Xinping Xu
X.-P. Xu, F. Liu
Quantum walks on Erdos-Renyi networks
6 pages, 6 figures. A working manuscript, comments and suggestions are welcome
Phys. Lett. A 372, 6727 (2008)
null
null
quant-ph
null
We study the coherent exciton transport of continuous-time quantum walks (CTQWs) on Erdos-Renyi networks. The Erdos-Renyi network of N nodes is constructed by connecting every pair of nodes with probability $p$. We numerically calculate the ensemble averaged transition probability of quantum transport between two nodes of the networks. For finite networks, we find that the limiting transition probability is reached very quickly. For infinite networks whose spectral density follows the semicircle law, the efficiencies of the classical and quantum-mechanical transport are compared on networks of different average degree. In the long time limiting, we consider the distribution of the ensemble averaged transition probabilities, and show that there is a high probability to find the exciton at the initial node. Such high return probability almost do not alter in a wide range of connection probability p but increases rapidly when the network approaches to be fully connected. For networks whose topology is not extremely connected, the return probability is inversely proportional to the network size N. Furthermore, the transport dynamics are compared with that on a random graph model in which the degree of each node equals to the average degree of the Erdos-Renyi networks.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 05:07:24 GMT" } ]
2008-11-03T00:00:00
[ [ "Xu", "X. -P.", "" ], [ "Liu", "F.", "" ] ]
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801.4116
Thomas Greene
Tom Greene, Colin Aspin, Bo Reipurth
High Resolution Near-Infrared Spectroscopy of FUors and FUor-like stars
21 pages, 4 figures, accepted by The Astronomical Journal
null
10.1088/0004-6256/135/4/1421
null
astro-ph
null
We present new high resolution (R=18,000) near-infrared spectroscopic observations of a sample of classical FU Orionis stars (FUors) and other young stars with FUor characteristics that are sources of Herbig-Haro flows. Spectra are presented for the region 2.203 - 2.236 microns which is rich in absorption lines sensitive to both effective temperatures and surface gravities of stars. Both FUors and FUor-like stars show numerous broad and weak unidentified spectral features in this region. Spectra of the 2.280 - 2.300 micron region are also presented, with the 2.2935 micron v=2-0 CO absorption bandhead being clearly the strongest feature seen in the spectra all FUors and Fuor-like stars. A cross-correlation analysis shows that FUor and FUor-like spectra in the 2.203 - 2.236 micron region are not consistent with late-type dwarfs, giants, nor embedded protostars. The cross-correlations also show that the observed FUor-like Herbig-Haro energy sources have spectra that are substantively similar to those of FUors. Both object groups also have similar near-infrared colors. The large line widths and double-peaked nature of the spectra of the FUor-like stars are consistent with the established accretion disk model for FUors, also consistent with their near-infrared colors. It appears that young stars with FUor-like characteristics may be more common than projected from the relatively few known classical FUors.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 06:26:50 GMT" } ]
2009-11-13T00:00:00
[ [ "Greene", "Tom", "" ], [ "Aspin", "Colin", "" ], [ "Reipurth", "Bo", "" ] ]
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801.4117
Jianwen Dong
J. W. Dong, J. Zeng, Q. F. Dai, and H. Z. Wang
Universal condition for the existence of interface modes in the whole momentum space with arbitrary materials
19 pages, 5 figures
null
null
null
physics.optics
null
It is shown that, by theoretical and experimental results, a universal zero-impedance condition exists for two kinds of localized interface modes in the whole momentum space (both above and below the light line). It can be applied at the interface between any two materials including photonic crystals, single-negative (negative-permittivity or negative-permeability) materials, or double-negative metamaterials. In addition, it presents an intuitive physical concept, and also provides a feasible way to determine interface modes, which will have predominance in various applications.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 07:41:31 GMT" } ]
2008-01-29T00:00:00
[ [ "Dong", "J. W.", "" ], [ "Zeng", "J.", "" ], [ "Dai", "Q. F.", "" ], [ "Wang", "H. Z.", "" ] ]
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801.4118
Zhao Ren
Zhao Ren, Zhang Li-Chun, Li Huai-Fan, Wu Yue-Qin
Entropy of Kerr-Newman black hole to all orders in the Planck length
12 pages
Int.J.Theor.Phys.47:3083-3090,2008
10.1007/s10773-008-9740-z
null
gr-qc
null
Using the quantum statistical method, the difficulty of solving the wave equation on the background of the black hole is avoided.We directly solve the partition functions of Bose and Fermi field on the background of an axisymmetric Kerr-Newman black hole using the new equation of state density motivated by the generalized uncertainty principle in the quantum gravity. Then near the black hole horizon, we calculate entropies of Bose and Fermi field between the black hole horizon surface and the hypersurface with the same inherent radiation temperature measured by an observer at an infinite distance. In our results there are not cutoffs and little mass approximation introduced in the conventional brick-wall method. The series expansion of the black hole entropy is obtained. And this series is convergent. It provides a way for studying the quantum statistical entropy of a black hole in a non-spherical symmetric spacetime.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 07:48:18 GMT" } ]
2009-01-01T00:00:00
[ [ "Ren", "Zhao", "" ], [ "Li-Chun", "Zhang", "" ], [ "Huai-Fan", "Li", "" ], [ "Yue-Qin", "Wu", "" ] ]
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801.4119
Uwe Aickelin
Gianni Tedesco and Uwe Aickelin
Strategic Alert Throttling for Intrusion Detection Systems
null
4th WSEAS International Conference on Information Security (WSEAS 2005), Tenerife, Spain, 2005
null
null
cs.NE cs.CR
null
Network intrusion detection systems are themselves becoming targets of attackers. Alert flood attacks may be used to conceal malicious activity by hiding it among a deluge of false alerts sent by the attacker. Although these types of attacks are very hard to stop completely, our aim is to present techniques that improve alert throughput and capacity to such an extent that the resources required to successfully mount the attack become prohibitive. The key idea presented is to combine a token bucket filter with a realtime correlation algorithm. The proposed algorithm throttles alert output from the IDS when an attack is detected. The attack graph used in the correlation algorithm is used to make sure that alerts crucial to forming strategies are not discarded by throttling.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 15:36:56 GMT" }, { "version": "v2", "created": "Mon, 3 Mar 2008 17:00:56 GMT" }, { "version": "v3", "created": "Fri, 16 May 2008 10:43:30 GMT" } ]
2010-07-05T00:00:00
[ [ "Tedesco", "Gianni", "" ], [ "Aickelin", "Uwe", "" ] ]
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801.412
Guanghui Zhou
Wenhu Liao, Guanghui Zhou, Kai-He Ding
Dependence of electronic and optical properties on a high-frequency field for carbon nanotubes
6 Revtex pages, 4 figures. to be appeared in JAP
Journal of Applied Physics 103, 073712 (2008)
10.1063/1.2903959
null
cond-mat.mes-hall cond-mat.mtrl-sci
null
We study theoretically the electronic structure, transport and optical properties for a zigzag single-wall carbon nanotube connected to two normal conductor leads under the irradiation of an external electromagnetic field at low temperatures, with particular emphasis on the features of high-frequency response. Using the standard nonequilibrium Green's function techniques, we examine the time-averaged density of states, the conductivity, the dielectric function and the electron energy loss spectra for the system with photon polarization parallel with the tunneling current direction, respectively. Through some numerical examples, it is shown that the density of states is strongly dependent on the incident electron energy, the strength and frequency of the applied field. For higher electron energies in comparison with lead-nanotube coupling energy, the system conductance decreases with increasing the field strength and increases with increasing the field frequency respectively, and shows some oscillation structures. Moreover, the optical functions for the system have also a rich structure with the variation of field frequency. It may demonstrate that this transport dependence on the external field parameters can be used to give the energy spectra information of carbon nanotubes and to detect the high-frequency microwave irradiation.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 08:28:17 GMT" } ]
2009-11-13T00:00:00
[ [ "Liao", "Wenhu", "" ], [ "Zhou", "Guanghui", "" ], [ "Ding", "Kai-He", "" ] ]
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801.4121
Claire David
Claire David (LMM)
A note on the Compound Burgers-Korteweg-de Vries Equation with higher-order nonlinearities and its traveling solitary waves
null
null
null
null
math.AP
null
In this paper, we study a compound Korteweg-de Vries-Burgers equation with a higher-order nonlinearity. A class of solitary wave solutions is obtained by means of a series expansion.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 09:17:57 GMT" } ]
2008-01-29T00:00:00
[ [ "David", "Claire", "", "LMM" ] ]
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801.4122
Tie Shen
Tie Shen, Ying Xiong, Haoran Zheng, Xiaosong Pan, Rui Bin, Jianping Liu, Jihui Wu, Weiqun Shen
Plotting Calibration Curve Using Biosynthetic Specifically Labeled Compounds for Accurate Mass Isotopomer Analysis
This paper has been withdrawn
null
null
null
q-bio.QM q-bio.BM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper has been withdrawn by the author(s), due to the requirement of the journal it currently submitted to
[ { "version": "v1", "created": "Sun, 27 Jan 2008 09:30:54 GMT" }, { "version": "v2", "created": "Wed, 28 May 2008 13:36:30 GMT" }, { "version": "v3", "created": "Mon, 20 Oct 2008 15:55:51 GMT" } ]
2008-10-20T00:00:00
[ [ "Shen", "Tie", "" ], [ "Xiong", "Ying", "" ], [ "Zheng", "Haoran", "" ], [ "Pan", "Xiaosong", "" ], [ "Bin", "Rui", "" ], [ "Liu", "Jianping", "" ], [ "Wu", "Jihui", "" ], [ "Shen", "Weiqun", "" ] ]
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801.4123
Nana Pan
Nana Pan, Li Zhang, Xiaoping Zheng
Interior matter estimates of the X-ray pulsar in SAX J1808.4-3658 from mass-radius and rotation measurements
3 pages, 2 figures
null
null
null
astro-ph
null
To constrain the equation of state of super-nuclear density matter and probe the interior composition of the X-ray pulsar in SAX J1808.4-3658. In our estimation, we consider both its persistent 2.49 ms X-ray pulsations discovered by Wijnands and van der Klis from using the Rossi X-ray Timing Explorer, which is interpreted to come from an accreting-powered millisecond X-ray pulsar in the low mass X-ray binaries, and the corresponding mass-radius data analyzed of the light curves of SAX J1808.4-3685 during its 1998 and 2005 outbursts by Leahy et al. from assuming a hot spot model where the X-rays are originated from the surface of the neutron star.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 10:57:50 GMT" } ]
2008-01-29T00:00:00
[ [ "Pan", "Nana", "" ], [ "Zhang", "Li", "" ], [ "Zheng", "Xiaoping", "" ] ]
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801.4124
Pedro Lacerda
Pedro Lacerda, David Jewitt, Nuno Peixinho
High Precision Photometry of Extreme KBO 2003 EL61
9 pages, 8 figures, 5 tables. Accepted for publication in The Astronomical Journal on 2008/01/25
null
10.1088/0004-6256/135/5/1749
null
astro-ph
null
We present high precision, time-resolved visible and near infrared photometry of the large (diameter ~ 2500 km) Kuiper belt object (136108) 2003 EL61. The new data confirm rapid rotation at period P = 3.9155+/-0.0001 hr with a peak-to-peak photometric range (Delta m_R) = 0.29+/-0.02 mag and further show subtle but reproducible color variations with rotation. Rotational deformation of 2003 EL61 alone would give rise to a symmetric lightcurve free of color variations. The observed photometric deviations from the best-fit equilibrium model show the existence of a large surface region with an albedo and color different from the mean surface of 2003 EL61. We explore constraints on the nature of this anomalous region set by the existing data.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 11:01:10 GMT" } ]
2009-11-13T00:00:00
[ [ "Lacerda", "Pedro", "" ], [ "Jewitt", "David", "" ], [ "Peixinho", "Nuno", "" ] ]
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801.4125
Iolanda Matea
I. Matea, J. Souin, J. Aysto, B. Blank, P. Delahaye, V.-V. Elomaa, T. Eronen, J. Giovinazzo, U. Hager, J. Hakala, J. Huikari, A. Jokinen, A. Kankainen, I.D. Moore, J.-L. Pedroza, S. Rahaman, J. Rissanen, J. Ronkainen, A. Saastamoinen, T. Sonoda, and C. Weber
Precise half-life measurement of the 26Si ground state
8 pages, 7 figures; accepted by EPJA
Eur.Phys.J.A37:151-158,2008; Erratum-ibid.38:247,2008
10.1140/epja/i2008-10623-5 10.1140/epja/i2008-10678-2
null
nucl-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The beta-decay half-life of 26Si was measured with a relative precision of 1.4*10e3. The measurement yields a value of 2.2283(27) s which is in good agreement with previous measurements but has a precision that is better by a factor of 4. In the same experiment, we have also measured the non-analogue branching ratios and could determine the super-allowed one with a precision similar to the previously reported measurements. The experiment was done at the Accelerator Laboratory of the University of Jyvaskyla where we used the IGISOL technique with the JYFLTRAP facility to separate pure samples of 26Si.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 11:39:39 GMT" }, { "version": "v2", "created": "Thu, 7 Aug 2008 13:35:06 GMT" } ]
2008-12-18T00:00:00
[ [ "Matea", "I.", "" ], [ "Souin", "J.", "" ], [ "Aysto", "J.", "" ], [ "Blank", "B.", "" ], [ "Delahaye", "P.", "" ], [ "Elomaa", "V. -V.", "" ], [ "Eronen", "T.", "" ], [ "Giovinazzo", "J.", "" ], [ "Hager", "U.", "" ], [ "Hakala", "J.", "" ], [ "Huikari", "J.", "" ], [ "Jokinen", "A.", "" ], [ "Kankainen", "A.", "" ], [ "Moore", "I. D.", "" ], [ "Pedroza", "J. -L.", "" ], [ "Rahaman", "S.", "" ], [ "Rissanen", "J.", "" ], [ "Ronkainen", "J.", "" ], [ "Saastamoinen", "A.", "" ], [ "Sonoda", "T.", "" ], [ "Weber", "C.", "" ] ]
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801.4126
Niels Kj{\ae}rgaard
P. J. Windpassinger, D. Oblak, P. G. Petrov, M. Kubasik, M. Saffman, C. L. Garrido Alzar, J. Appel, J. H. Mueller, N. Kjaergaard, E. S. Polzik
Non-Destructive Probing of Rabi Oscillations on the Cesium Clock Transition near the Standard Quantum Limit
4 pages, 4 figures, accepted for publication in Physical Review Letters
Phys. Rev. Lett. 100, 103601 (2008)
10.1103/PhysRevLett.100.103601
null
quant-ph
null
We report on non-destructive observation of Rabi oscillations on the Cs clock transition. The internal atomic state evolution of a dipole-trapped ensemble of cold atoms is inferred from the phase shift of a probe laser beam as measured using a Mach-Zehnder interferometer. We describe a single color as well as a two-color probing scheme. Using the latter, measurements of the collective pseudo-spin projection of atoms in a superposition of the clock states are performed and the observed spin fluctuations are shown to be close to the standard quantum limit.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 11:43:57 GMT" } ]
2008-03-15T00:00:00
[ [ "Windpassinger", "P. J.", "" ], [ "Oblak", "D.", "" ], [ "Petrov", "P. G.", "" ], [ "Kubasik", "M.", "" ], [ "Saffman", "M.", "" ], [ "Alzar", "C. L. Garrido", "" ], [ "Appel", "J.", "" ], [ "Mueller", "J. H.", "" ], [ "Kjaergaard", "N.", "" ], [ "Polzik", "E. S.", "" ] ]
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801.4127
Sebastian Klein
Sebastian Klein
Reconstructing the geometric structure of a Riemannian symmetric space from its Satake diagram
23 pages, also contains two Maple worksheets and technical documentation
null
10.1007/s10711-008-9297-2
null
math.DG
null
The local geometry of a Riemannian symmetric space is described completely by the Riemannian metric and the Riemannian curvature tensor of the space. In the present article I describe how to compute these tensors for any Riemannian symmetric space from the Satake diagram, in a way that is suited for the use with computer algebra systems. As an example application, the totally geodesic submanifolds of the Riemannian symmetric space SU(3)/SO(3) are classified. The submission also contains an example implementation of the algorithms and formulas of the paper as a package for Maple 10, the technical documentation for this implementation, and a worksheet carrying out the computations for the space SU(3)/SO(3) used in the proof of Proposition 6.1 of the paper.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 16:25:30 GMT" } ]
2008-10-15T00:00:00
[ [ "Klein", "Sebastian", "" ] ]
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801.4128
Zhongzhi Zhang
Zhongzhi Zhang, Shuigeng Zhou, Yi Qi, and Jihong Guan
Topologies and Laplacian spectra of a deterministic uniform recursive tree
7 pages, 1 figures, definitive version accepted for publication in EPJB
Eur. Phys. J. B 63, 507-513 (2008).
10.1140/epjb/e2008-00262-2
null
cond-mat.stat-mech
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The uniform recursive tree (URT) is one of the most important models and has been successfully applied to many fields. Here we study exactly the topological characteristics and spectral properties of the Laplacian matrix of a deterministic uniform recursive tree, which is a deterministic version of URT. Firstly, from the perspective of complex networks, we determine the main structural characteristics of the deterministic tree. The obtained vigorous results show that the network has an exponential degree distribution, small average path length, power-law distribution of node betweenness, and positive degree-degree correlations. Then we determine the complete Laplacian spectra (eigenvalues) and their corresponding eigenvectors of the considered graph. Interestingly, all the Laplacian eigenvalues are distinct.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 12:30:12 GMT" }, { "version": "v2", "created": "Wed, 25 Jun 2008 13:07:28 GMT" } ]
2008-07-11T00:00:00
[ [ "Zhang", "Zhongzhi", "" ], [ "Zhou", "Shuigeng", "" ], [ "Qi", "Yi", "" ], [ "Guan", "Jihong", "" ] ]
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801.4129
Amichai Sanderovich
Amichai Sanderovich, Michael Peleg and Shlomo Shamai
Scaling Laws and Techniques in Decentralized Processing of Interfered Gaussian Channels
Submitted to European Transactions on Telecommunication
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The scaling laws of the achievable communication rates and the corresponding upper bounds of distributed reception in the presence of an interfering signal are investigated. The scheme includes one transmitter communicating to a remote destination via two relays, which forward messages to the remote destination through reliable links with finite capacities. The relays receive the transmission along with some unknown interference. We focus on three common settings for distributed reception, wherein the scaling laws of the capacity (the pre-log as the power of the transmitter and the interference are taken to infinity) are completely characterized. It is shown in most cases that in order to overcome the interference, a definite amount of information about the interference needs to be forwarded along with the desired message, to the destination. It is exemplified in one scenario that the cut-set upper bound is strictly loose. The results are derived using the cut-set along with a new bounding technique, which relies on multi letter expressions. Furthermore, lattices are found to be a useful communication technique in this setting, and are used to characterize the scaling laws of achievable rates.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 12:47:04 GMT" }, { "version": "v2", "created": "Mon, 7 Dec 2009 22:16:00 GMT" } ]
2009-12-08T00:00:00
[ [ "Sanderovich", "Amichai", "" ], [ "Peleg", "Michael", "" ], [ "Shamai", "Shlomo", "" ] ]
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801.413
Klas Olof Daniel Andersson
Daniel Andersson
Solving Min-Max Problems with Applications to Games
null
null
null
null
cs.GT cs.DS
null
We refine existing general network optimization techniques, give new characterizations for the class of problems to which they can be applied, and show that they can also be used to solve various two-player games in almost linear time. Among these is a new variant of the network interdiction problem, where the interdictor wants to destroy high-capacity paths from the source to the destination using a vertex-wise limited budget of arc removals. We also show that replacing the limit average in mean payoff games by the maximum weight results in a class of games amenable to these techniques.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 13:28:43 GMT" } ]
2008-01-29T00:00:00
[ [ "Andersson", "Daniel", "" ] ]
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801.4131
Eran Bouchbinder
Eran Bouchbinder
Effective Temperature Dynamics in an Athermal Amorphous Plasticity Theory
10 pages, 4 figures; new experimental ref., additional discussions
Phys. Rev. E 77, 051505 (2008)
10.1103/PhysRevE.77.051505
null
cond-mat.mtrl-sci cond-mat.stat-mech
null
Recent developments in the theory of amorphous plasticity point to the central role played by the concept of an effective disorder temperature $T_{eff}$. An athermal dynamics for $T_{eff}$ are proposed in the framework of a deformation theory and discussed in light of the recent steady state simulations by Haxton and Liu [Phys. Rev. Lett. {\bf 99}, 195701 (2007)]. The structure of the resulting theory, its parameters and transient dynamics are discussed and compared to available data.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 13:55:52 GMT" }, { "version": "v2", "created": "Wed, 7 May 2008 15:16:21 GMT" } ]
2009-11-13T00:00:00
[ [ "Bouchbinder", "Eran", "" ] ]
[ 0.0638641939, 0.0357980914, -0.0495801046, -0.0065207249, 0.0403167829, -0.0454379693, 0.0345428959, 0.0137318056, -0.0889178365, -0.0597471632, 0.0450112037, -0.0038032334, -0.1444977671, -0.022731537, 0.0488520935, 0.0893194973, 0.070340991, 0.0205475017, 0.0170706175, 0.0210872348, -0.0816377178, -0.0668766573, -0.0215140004, -0.0309279431, -0.0502579063, -0.0532703698, 0.0544753559, 0.0809348151, 0.0794787928, 0.0015634992, 0.0549272224, -0.0341663398, 0.0127778593, -0.0720982552, -0.0618056804, 0.1332512349, 0.0177860782, 0.1011183113, -0.0503834262, -0.0688347593, -0.0101105757, -0.0067529357, -0.0926834121, 0.148614794, 0.0048795608, -0.0555799231, 0.0282920394, 0.1243142635, 0.0917796791, 0.0241122488, 0.0293715037, -0.0335387439, 0.0288694277, -0.0615546405, -0.1522297412, 0.028593285, 0.0150874136, 0.0386850312, 0.0587430075, -0.1005158126, -0.034266755, -0.0581405163, -0.0441576727, 0.0157150105, -0.0350700803, -0.0336642638, -0.1706057638, 0.0547766015, 0.0471199267, 0.131042093, -0.0184889864, -0.0023362271, 0.0235223081, -0.0258067586, -0.0303505547, -0.0388356559, -0.0443333983, -0.0477475226, -0.0139577407, 0.114473559, -0.0390364863, 0.0427016504, 0.0712949336, -0.0060311998, -0.0640148148, -0.0369026586, -0.0049893903, -0.0032023098, -0.0388105512, -0.0516135171, 0.0305513851, 0.0950933844, 0.0239741765, 0.1229084507, 0.0023440721, -0.0758136287, 0.0156145943, 0.0317061618, 0.0478228331, 0.0000930117, -0.0233842358, 0.0186019521, -0.0068659028, -0.0144598177, 0.0881145149, -0.035747882, -0.1275275648, 0.0121000558, -0.0580401011, -0.0105875488, 0.1244146824, 0.0021887419, -0.0171584822, -0.0340659246, -0.0730522051, -0.109553203, -0.0671276972, 0.051387582, -0.0700397417, 0.0386850312, -0.0421995707, 0.1253184229, 0.028342247, 0.0405176133, -0.0486763641, -0.081236057, 0.0766169503, -0.0683326796, -0.1564471871, -0.0311538782, 0.1147748008, -0.0518143475, 0.0376557745, -0.1259209067, -0.0304007623, -0.1259209067, 0.0688347593, 0.0873613954, 0.1081473827, -0.0234344434, 0.0210746825, 0.0856543332, 0.005011356, 0.04154687, 0.0307271127, 0.0488771945, 0.1175864339, -0.0337395743, 0.092934452, 0.0553790927, -0.0181751866, 0.0075374311, 0.1382720023, 0.0091880094, 0.1839610189, -0.1125656664, 0.1059382483, 0.073353447, 0.0463919155, -0.1188918352, -0.0183132589, 0.0126397889, -0.0488520935, 0.0201583914, 0.1034278646, 0.1009174734, -0.0029748061, 0.0178613886, -0.052868709, -0.0552284718, -0.0620567165, -0.0344675854, -0.1065407395, -0.0132673848, 0.0719978437, 0.0324090719, 0.0442329831, -0.0472203419, -0.0430280007, 0.0979552194, 0.053370785, 0.003523953, -0.0349947661, -0.0308024231, -0.0030673766, -0.0303756576, -0.0327354223, 0.1145739704, -0.0384590998, 0.0172588974, -0.0169199947, 0.1062394902, 0.0487014689, -0.0340910293, -0.022731537, -0.0404674076, 0.0745082274, 0.0447852686, 0.0772194415, 0.0623579621, 0.0758638382, 0.0153133487, 0.0535716154, 0.0332374983, -0.0785750523, -0.0142966425, -0.0160162561, 0.0381327495, -0.0971016884, 0.0201709438, 0.0304258671, -0.0495801046, 0.0563832484, 0.0073491521, -0.0457141101, 0.0069725942, 0.0152882449, 0.0824410468, 0.0261582118, 0.1697020233, -0.0475968979, -0.0498813502, 0.0531699546, 0.0678808093, 0.0094013922, -0.0473709665, -0.0045689009, -0.0114285275, 0.0102235433, 0.0159283932, 0.0334634334, 0.0196186583, -0.0158405285, 0.0100415396, -0.0142715387, -0.0241247993, -0.0254050959, 0.0227942951, 0.0595463328, -0.0468939915, -0.0350951813, -0.0028257521, -0.0696882904, -0.0239867289, -0.0233591329, 0.0692364201, -0.0892692879, -0.0373043194, 0.041521769, -0.0346433148, 0.0217650384, -0.0385093056, -0.0119055007, -0.0076566744, -0.0459902547, -0.0716463849 ]
801.4132
Yuan Li
Yuan Li and You-Quan Li
Spin dynamics of two-dimensional electrons with Rashba spin-orbit coupling and electron-electron interactions
accepted for publication in Phys. Rev. B
Phys. Rev. B 78, 195325 (2008)
10.1103/PhysRevB.78.195325
null
cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the spin dynamics of two dimensional electron gases (2DEGs) with Rashba spin-orbit coupling by taking account of electron-electron interactions. The diffusion equations for charge and spin densities are derived by making use of the path-integral approach and the quasiclassical Green's function. Analyzing the effect of the interactions, we show that the spin-relaxation time can be enhanced by the electron-electron interaction in the ballistic regime.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 14:02:27 GMT" }, { "version": "v2", "created": "Mon, 3 Nov 2008 12:47:47 GMT" } ]
2008-11-26T00:00:00
[ [ "Li", "Yuan", "" ], [ "Li", "You-Quan", "" ] ]
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801.4133
Graham White
Graham White
Causality, Modality and Explanation
33 pages: to appear in the Notre Dame Journal of Formal Logic
null
null
null
math.LO
null
We present a sequent calculus system for a modal reformulation of a system of nonmonotonic logic due to McCain and Turner: we prove cut elimination for our system. The proof system is in general infinitary: because we can prove cut elimination, many applications need, in practice, only the application of finitary rules. Consequently, nonmonotonic logic is, in many cases, much less scary than it might seem to be a priori. We derive from this a critique of Fodor's philosophical worries about the nonmonotonicity of human reasoning.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 14:27:35 GMT" } ]
2008-01-29T00:00:00
[ [ "White", "Graham", "" ] ]
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801.4134
Giovanni Lapenta
Giovanni Lapenta
The algorithms of the implicit moment method for plasma simulation
null
null
null
null
physics.comp-ph physics.plasm-ph
null
We discuss the fundamentals of the implicit moment method for Particle In Cell (PIC) simulation as presently implemented in the CELESTE3D code. We present the method in its fully electromagnetic and fully kinetic version. The application of the method is to problems with multiple temporal and spatial scales, common in all space, astrophysical and laboratory plasmas.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 14:36:37 GMT" } ]
2008-01-29T00:00:00
[ [ "Lapenta", "Giovanni", "" ] ]
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801.4135
Yougang Wang
You-gang Wang, Xufen Wu, HongSheng Zhao
Self-consistent models of triaxial galaxies in MOND gravity
19 pages, 1 table, 7 figures, Accepted for publication in ApJ
null
10.1086/533489
The Astrophysical Journal, 677:1033
astro-ph
null
The Bekenstein-Milgrom gravity theory with a modified Poisson equation is tested here for the existence of triaxial equilibrium solutions. Using the non-negative least square method, we show that self-consistent triaxial galaxies exist for baryonic models with a mild density cusp $\rho \sim {\Sigma \over r}$. Self-consistency is achieved for a wide range of central concentrations, $\Sigma \sim 10-1000\mathrm{M_{\odot}pc^{-2}}$, representing low-to-high surface brightness galaxies. Our results demonstrate for the first time that the orbit superposition technique is fruitful for constructing galaxy models beyond Newtonian gravity, and triaxial cuspy galaxies might exist without the help of Cold dark Matter.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 14:47:43 GMT" } ]
2008-04-13T00:00:00
[ [ "Wang", "You-gang", "" ], [ "Wu", "Xufen", "" ], [ "Zhao", "HongSheng", "" ] ]
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801.4136
Toshiro Kuwabara
Toshiro Kuwabara
Characteristic cycles of standard modules for the rational Cherednik algebra of type Z/lZ
40 pages, To appear in J. Math. Kyoto Univ
null
null
null
math.RT math.AG
null
We study the representation theory of the rational Cherednik algebra $H_\kappa = H_\kappa({\mathbb Z}_l)$ for the cyclic group ${\mathbb Z}_l = {\mathbb Z} / l {\mathbb Z}$ and its connection with the geometry of the quiver variety $M_\theta(\delta)$ of type $A_{l-1}^{(1)}$. We consider a functor between the categories of $H_\kappa$-modules with different parameters, called the shift functor, and give the condition when it is an equivalence of categories. We also consider a functor from the category of $H_\kappa$-modules with good filtration to the category of coherent sheaves on $M_\theta(\delta)$. We prove that the image of the regular representation of $H_\kappa$ by this functor is the tautological bundle on $M_\theta(\delta)$. As a corollary, we determine the characteristic cycles of the standard modules. It gives an affirmative answer to a conjecture given in [Gordon, arXiv:math/0703150v1] in the case of ${\mathbb Z}_l$.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 15:21:34 GMT" } ]
2008-01-29T00:00:00
[ [ "Kuwabara", "Toshiro", "" ] ]
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801.4137
Vyacheslav P. Spiridonov
V.P. Spiridonov
Continuous biorthogonality of the elliptic hypergeometric function
23 pages; minor modifications
Algebra i Analiz (St. Petersburg Math. J.) 20 (2008), no. 5, 155-185
null
null
math.QA math.CA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We construct a family of continuous biorthogonal functions related to an elliptic analogue of the Gauss hypergeometric function. The key tools used for that are the elliptic beta integral and the integral Bailey chain introduced earlier by the author. Relations to the Sklyanin algebra and elliptic analogues of the Faddeev modular double are discussed in detail.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 15:22:07 GMT" }, { "version": "v2", "created": "Fri, 20 Mar 2009 14:26:17 GMT" } ]
2009-03-20T00:00:00
[ [ "Spiridonov", "V. P.", "" ] ]
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801.4138
Nguyen Chau Van
Nguyen Van Chau
Plane Jacobian problem for rational polynomials
This paper has been withdrawn
null
null
null
math.AG math.AC
null
This paper has been withdrawn by the author due to a crucial error in the last lines in the proof of Lemma 3.3.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 16:02:04 GMT" }, { "version": "v2", "created": "Thu, 17 Apr 2008 07:01:50 GMT" } ]
2008-04-17T00:00:00
[ [ "Van Chau", "Nguyen", "" ] ]
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801.4139
Antonio Crapsi
A. Crapsi (1,2), E. F. van Dishoeck (1), M. R. Hogerheijde (1), K. M. Pontoppidan (3), and C.P. Dullemond (4) ((1) Sterrewacht Leiden (2) Observatorio Astronomico Nacional (3) GPS (4) Max-Plank-Institut fur Astronomie)
Characterizing the nature of embedded young stellar objects through silicate, ice and millimeter observations
14 pages, 6 figures. Accepted by Astronomy and Astrophysics. replaced with published version
null
10.1051/0004-6361:20078589
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
(Abridged) Classification schemes for YSOs are based on evaluating the degree of dissipation of the surrounding envelope, whose main effects are the extinction of the optical radiation from the central YSO and re-emission in the far-infrared. Since extinction is a property of column density along the line of sight, the presence of a protoplanetary disk may lead to a misclassification when the system is viewed edge-on. We performed radiative transfer calculations, using the axysimmetric 3D radiative transfer codes RADMC and RADICAL, to show the effects of different geometries on the main indicators of YSO evolutionary stage, like the slope of the flux between 2 and 24mum, the bolometric temperature and the optical depth of silicates and ices. We show that for systems viewed at intermediate angles the 'classical' indicators of evolution accurately trace the envelope column density, and they all agree with each other. On the other hand, edge-on system are misclassified for inclinations larger than ~65deg. In particular, silicate emission, typical of pre-main sequence stars with disks, turns into absorption when the disk column density reaches 1e22cm-2, corresponding e.g. to a 5e-3 Msun flaring disk viewed at 64deg. A similar effect is noticed in all the other classification indicators studied alpha, Tbol, and the H2O and CO2 ices absorption strengths. This misclassification has a big impact on the nature of the flat-spectrum sources (alpha ~0), whose number can be explained by simple geometrical arguments without invoking evolution. A reliable classification scheme using a minimal number of observations is constituted by observations of the mm-flux with both a single dish and an interferometer.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 16:04:59 GMT" }, { "version": "v2", "created": "Sun, 22 Jun 2008 14:07:09 GMT" } ]
2009-11-13T00:00:00
[ [ "Crapsi", "A.", "" ], [ "van Dishoeck", "E. F.", "" ], [ "Hogerheijde", "M. R.", "" ], [ "Pontoppidan", "K. M.", "" ], [ "Dullemond", "C. P.", "" ] ]
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801.414
Dan Solomon
Dan Solomon
Dirac's hole theory and the Pauli principle: clearing up the confusion
Paper accepted by Advanced Studies in Theoretical Physics. Minor changes in Appendix
Adv. Studies Theor. Phys., Vol. 3, 2009, no. 9-12, 323-332
null
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In Dirac's hole theory (HT) the vacuum state is generally believed to be the state of minimum energy due to the assumption that the Pauli Exclusion Principle prevents the decay of positive energy electrons into occupied negative energy states. However recently papers have appeared that claim to show that there exist states with less energy than that of the vacuum[4][5][6]. Here we will consider a simple model of HT consisting of zero mass electrons in 1-1D space-time. It will be shown that for this model there are states with less energy than the HT vacuum state and that the Pauli Principle is obeyed. Therefore the conjecture that the Pauli Principle prevents the existence of states with less energy than the vacuum state is not correct.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 16:05:03 GMT" }, { "version": "v2", "created": "Sun, 24 Feb 2008 23:43:19 GMT" }, { "version": "v3", "created": "Sun, 20 Apr 2008 22:36:26 GMT" }, { "version": "v4", "created": "Wed, 3 Jun 2009 11:46:59 GMT" }, { "version": "v5", "created": "Sun, 28 Jun 2009 16:30:23 GMT" } ]
2009-12-14T00:00:00
[ [ "Solomon", "Dan", "" ] ]
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801.4141
Mark Sapir
Cornelia Drutu, Shahar Mozes, Mark Sapir
Divergence in lattices in semisimple Lie groups and graphs of groups
v1: 34 pages; v2: implemented referee's comments/ The paper is accepted in Tr.AMS v3: more small changes are made, especially in Section 3, v6: added an erratum correcting Proposition 3.24 and Theorems 4.4, 4.9; v7: fixed the proof of Theorem 7.7
null
null
null
math.GR math.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Divergence functions of a metric space estimate the length of a path connecting two points $A$, $B$ at distance $\le n$ avoiding a large enough ball around a third point $C$. We characterize groups with non-linear divergence functions as groups having cut-points in their asymptotic cones. By Olshanskii-Osin-Sapir, that property is weaker than the property of having Morse (rank 1) quasi-geodesics. Using our characterization of Morse quasi-geodesics, we give a new proof of the theorem of Farb-Kaimanovich-Masur that states that mapping class groups cannot contain copies of irreducible lattices in semi-simple Lie groups of higher ranks. It also gives a generalization of the result of Birman-Lubotzky-McCarthy about solvable subgroups of mapping class groups not covered by the Tits alternative of Ivanov and McCarthy. We show that any group acting acylindrically on a simplicial tree or a locally compact hyperbolic graph always has "many" periodic Morse quasi-geodesics (i.e. Morse elements), so its divergence functions are never linear. We also show that the same result holds in many cases when the hyperbolic graph satisfies Bowditch's properties that are weaker than local compactness. This gives a new proof of Behrstock's result that every pseudo-Anosov element in a mapping class group is Morse. On the other hand, we conjecture that lattices in semi-simple Lie groups of higher rank always have linear divergence. We prove it in the case when the $\mathbb{Q}$-rank is 1 and when the lattice is $SL_n(\mathcal{O}_S)$ where $n\ge 3$, $S$ is a finite set of valuations of a number field $K$ including all infinite valuations, and $\mathcal{O}_S$ is the corresponding ring of $S$-integers.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 16:06:08 GMT" }, { "version": "v2", "created": "Mon, 4 Feb 2008 23:09:25 GMT" }, { "version": "v3", "created": "Fri, 8 Feb 2008 13:15:11 GMT" }, { "version": "v4", "created": "Sat, 19 Jul 2008 21:03:59 GMT" }, { "version": "v5", "created": "Fri, 1 May 2009 15:23:16 GMT" }, { "version": "v6", "created": "Mon, 10 Apr 2017 15:05:39 GMT" }, { "version": "v7", "created": "Mon, 12 Jun 2017 22:30:16 GMT" } ]
2017-06-14T00:00:00
[ [ "Drutu", "Cornelia", "" ], [ "Mozes", "Shahar", "" ], [ "Sapir", "Mark", "" ] ]
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801.4142
Hongguang Zhang
Hong-Guang Zhang, Jie Ren, Xin-He Meng
Modification from Noncommutative Inflation
8 pages, 2 figures
null
null
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We explore the noncommutative effect on single field inflation and compare with WMAP five-year data. First, we calculate the noncommutative effect from the potential and dynamical terms, and construct the general form of modified power spectrum. Second, we consider the leading order modification of slow-roll, DBI and K-inflation and unite the modification, which means the modification is nearly model independent at this level. Finally, comparing with the WMAP5 data, we find that the modified can be well realized as the origin of the relative large spectral index and the quite small running.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 16:17:58 GMT" }, { "version": "v2", "created": "Wed, 7 Jan 2009 16:16:47 GMT" }, { "version": "v3", "created": "Thu, 18 Jun 2009 15:06:22 GMT" } ]
2009-06-18T00:00:00
[ [ "Zhang", "Hong-Guang", "" ], [ "Ren", "Jie", "" ], [ "Meng", "Xin-He", "" ] ]
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801.4143
Iskander A. Taimanov
P.G. Grinevich, I.A. Taimanov
Spectral conservation laws for periodic nonlinear equations of the Melnikov type
16 pages
Amer. Math. Soc. Transl. Ser. 2, V. 224, 2008, 125-138
null
null
math-ph math.MP
null
We consider the nonlinear equations obtained from soliton equations by adding self-consistent sources. We demonstrate by using as an example the Kadomtsev-Petviashvili equation that such equations on periodic functions are not isospectral. They deform the spectral curve but preserve the multipliers of the Floquet functions. The latter property implies that the conservation laws, for soliton equations, which may be described in terms of the Floquet multipliers give rise to conservation laws for the corresponding equations with self-consistent sources. Such a property was first observed by us for some geometrical flow which appears in the conformal geometry of tori in three- and four-dimensional Euclidean spaces (math/0611215).
[ { "version": "v1", "created": "Sun, 27 Jan 2008 21:33:10 GMT" } ]
2009-01-12T00:00:00
[ [ "Grinevich", "P. G.", "" ], [ "Taimanov", "I. A.", "" ] ]
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801.4144
Junbo Li
Junbo Li, Yucai Su
Lie bialgebra structures on the $W$-algebra W(2,2)
14 pages
null
null
null
math.RA
null
Verma modules over the $W$-algebra W(2,2) were considered by Zhang and Dong, while the Harish-Chandra modules and irreducible weight modules over the same algebra were classified by Liu and Zhu etc. In the present paper we shall investigate the Lie bialgebra structures on the referred algebra, which are shown to be triangular coboundary.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 18:16:29 GMT" } ]
2008-01-29T00:00:00
[ [ "Li", "Junbo", "" ], [ "Su", "Yucai", "" ] ]
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801.4145
Valentin Zagrebnov
Valentin Zagrebnov (CPT)
From Laplacian Transport to Dirichlet-to-Neumann (Gibbs) Semigroups
null
null
null
null
math.FA
null
The paper gives a short account of some basic properties of \textit{Dirichlet-to-Neumann} operators $\Lambda_{\gamma,\partial\Omega}$ including the corresponding semigroups motivated by the Laplacian transport in anisotropic media ($\gamma \neq I$) and by elliptic systems with dynamical boundary conditions. For illustration of these notions and the properties we use the explicitly constructed \textit{Lax semigroups}. We demonstrate that for a general smooth bounded convex domain $\Omega \subset \mathbb{R}^d$ the corresponding {Dirichlet-to-Neumann} semigroup $\left\{U(t):= e^{-t \Lambda_{\gamma,\partial\Omega}}\right\}_{t\geq0}$ in the Hilbert space $L^2(\partial \Omega)$ belongs to the \textit{trace-norm} von Neumann-Schatten ideal for any $t>0$. This means that it is in fact an \textit{immediate Gibbs} semigroup. Recently Emamirad and Laadnani have constructed a \textit{Trotter-Kato-Chernoff} product-type approximating family $\left\{(V_{\gamma, \partial\Omega}(t/n))^n \right\}_{n \geq 1}$ \textit{strongly} converging to the semigroup $U(t)$ for $n\to\infty$. We conclude the paper by discussion of a conjecture about convergence of the \textit{Emamirad-Laadnani approximantes} in the the {\textit{trace-norm}} topology.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 18:18:56 GMT" } ]
2008-01-29T00:00:00
[ [ "Zagrebnov", "Valentin", "", "CPT" ] ]
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801.4146
Ilia Negri
Ilia Negri, Yoichi Nishiyama
Goodness of fit test for small diffusions by discrete observations
null
null
null
null
math.ST stat.TH
null
We consider a nonparametric goodness of fit test problem for the drift coefficient of one-dimensional small diffusions. Our test is based on discrete observation of the processes, and the diffusion coefficient is a nuisance function which is estimated in our testing procedure. We prove that the limit distribution of our test is the supremum of the standard Brownian motion, and thus our test is asymptotically distribution free. We also show that our test is consistent under any fixed alternatives.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 18:28:42 GMT" } ]
2008-01-29T00:00:00
[ [ "Negri", "Ilia", "" ], [ "Nishiyama", "Yoichi", "" ] ]
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801.4147
Marcus Bluhm
M. Bluhm (Forschungszentrum Dresden-Rossendorf), B. Kampfer (Forschungszentrum Dresden-Rossendorf & Dresden, Tech. U.)
Flavor Diagonal and Off-Diagonal Susceptibilities in a Quasiparticle Model of the Quark-Gluon Plasma
Jan 2008. 25 pp
Phys.Rev.D77:114016,2008
10.1103/PhysRevD.77.114016
null
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Taylor coefficients of flavor diagonal and off-diagonal susceptibilities as well as baryon number, isovector and electric charge susceptibilities are considered within a phenomenological quasiparticle model of the quark-gluon plasma and successfully compared with lattice QCD data for two degenerate quark flavors. These susceptibility coefficients represent sensible probes of baryon density effects in the equation of state. The baryon charge is carried, in our model, by quark-quasiparticle excitations for hard momenta.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 18:52:55 GMT" }, { "version": "v2", "created": "Tue, 8 Jul 2008 09:01:35 GMT" } ]
2008-11-26T00:00:00
[ [ "Bluhm", "M.", "", "Forschungszentrum Dresden-Rossendorf" ], [ "Kampfer", "B.", "", "Forschungszentrum Dresden-Rossendorf & Dresden, Tech. U." ] ]
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801.4148
Jose Geraldo Pereira
R. Aldrovandi, J. G. Pereira
Gravitation: in search of the missing torsion
18 pages. To be published in the special issue on torsion of the Annales de la Fondation Louis de Broglie, volume editor V. Dvoeglazov
Ann. Fond. Louis de Broglie 32 (2007) 229
null
null
gr-qc hep-th
null
A linear Lorentz connection has always two fundamental derived characteristics: curvature and torsion. The latter is assumed to vanish in general relativity. Three gravitational models involving non-vanishing torsion are examined: teleparallel gravity, Einstein-Cartan, and new general relativity. Their dependability is critically examined. Although a final answer can only be given by experience, it is argued that teleparallel gravity provides the most consistent approach.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 19:39:16 GMT" } ]
2008-06-13T00:00:00
[ [ "Aldrovandi", "R.", "" ], [ "Pereira", "J. G.", "" ] ]
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801.4149
Atsushi Nishizawa
Atsushi Nishizawa, Seiji Kawamura, Tomotada Akutsu, Koji Arai, Kazuhiro Yamamoto, Daisuke Tatsumi, Erina Nishida, Masa-aki Sakagami, Takeshi Chiba, Ryuichi Takahashi, Naoshi Sugiyama
Optimal Location of Two Laser-interferometric Detectors for Gravitational Wave Backgrounds at 100 MHz
17 pages, 6 figures
Class.Quant.Grav.25:225011,2008
10.1088/0264-9381/25/22/225011
null
gr-qc
null
Recently, observational searches for gravitational wave background (GWB) have been developed and given constraints on the energy density of GWB in a broad range of frequencies. These constraints have already resulted in the rejection of some theoretical models of relatively large GWB spectra. However, at 100 MHz, there is no strict upper limit from direct observation, though an indirect limit exists due to He4 abundance due to big-bang nucleosynthesis. In our previous paper, we investigated the detector designs that can effectively respond to GW at high frequencies, where the wavelength of GW is comparable to the size of a detector, and found that the configuration, a so-called synchronous-recycling interferometer is best at these sensitivity. In this paper, we investigated the optimal location of two synchronous-recycling interferometers and derived their cross-correlation sensitivity to GWB. We found that the sensitivity is nearly optimized and hardly changed if two coaligned detectors are located within a range 0.2 m, and that the sensitivity achievable in an experiment is far below compared with the constraint previously obtained in experiments.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 19:50:46 GMT" } ]
2008-11-26T00:00:00
[ [ "Nishizawa", "Atsushi", "" ], [ "Kawamura", "Seiji", "" ], [ "Akutsu", "Tomotada", "" ], [ "Arai", "Koji", "" ], [ "Yamamoto", "Kazuhiro", "" ], [ "Tatsumi", "Daisuke", "" ], [ "Nishida", "Erina", "" ], [ "Sakagami", "Masa-aki", "" ], [ "Chiba", "Takeshi", "" ], [ "Takahashi", "Ryuichi", "" ], [ "Sugiyama", "Naoshi", "" ] ]
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801.415
Herbert Hoeger Dr
G. Diaz, J. Florez-Lopez, V. Hamar, H. Hoeger, C. Mendoza, Z. Mendez, L. A. Nunez, N. Ruiz, R. Torrens, M. Uzcategui
e-Science perspectives in Venezuela
Presented at the Third Conference of the EELA Project in Catania, Italy, Dec 2007
Proceedings of the Third EELA Conference, R. Gavela, B. Marechal, R. Barbera, L.N. Ciuffo, R. Mayo. (Editors), CIEMAT, Madrid, Spain (2007), pp 131-139
null
null
cs.DC
null
We describe the e-Science strategy in Venezuela, in particular initiatives by the Centro Nacional de Calculo Cientifico Universidad de Los Andes (CECALCULA), Merida, the Universidad de Los Andes (ULA), Merida, and the Instituto Venezolano de Investigaciones Cientificas (IVIC), Caracas. We present the plans for the Venezuelan Academic Grid and the current status of Grid ULA supported by Internet2. We show different web-based scientific applications that are being developed in quantum chemistry, atomic physics, structural damage analysis, biomedicine and bioclimate within the framework of the E-Infrastructure shared between Europe and Latin America (EELA)
[ { "version": "v1", "created": "Sun, 27 Jan 2008 20:22:29 GMT" } ]
2008-01-29T00:00:00
[ [ "Diaz", "G.", "" ], [ "Florez-Lopez", "J.", "" ], [ "Hamar", "V.", "" ], [ "Hoeger", "H.", "" ], [ "Mendoza", "C.", "" ], [ "Mendez", "Z.", "" ], [ "Nunez", "L. A.", "" ], [ "Ruiz", "N.", "" ], [ "Torrens", "R.", "" ], [ "Uzcategui", "M.", "" ] ]
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801.4151
Jes\'us Mu\~noz D\'iaz
J. Mu\~noz D\'iaz
The structure of time and inertial forces in Lagrangian mechanics
35 pages
null
null
null
math-ph math.DG math.MP
null
Classically time is kept fixed for infinitesimal variations in problems in mechanics. Apparently, there appears to be no mathematical justification in the literature for this standard procedure. This can be explained canonically by unveiling the intrinsic mathematical structure of time in Lagrangian mechanics. Moreover, this structure also offers a general method to deal with inertial forces.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 20:26:01 GMT" } ]
2008-01-29T00:00:00
[ [ "Díaz", "J. Muñoz", "" ] ]
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801.4152
David Lacoste
D. Lacoste, A.W.C. Lau and K. Mallick
Fluctuation theorem and large deviation function for a solvable model of a molecular motor
15 pages, 9 figures
Phys. Rev. E 78, 1 (2008)
10.1103/PhysRevE.78.011915
null
cond-mat.stat-mech cond-mat.soft
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study a discrete stochastic model of a molecular motor. This discrete model can be viewed as a \emph{minimal} ratchet model. We extend our previous work on this model, by further investigating the constraints imposed by the Fluctuation Theorem on the operation of a molecular motor far from equilibrium. In this work, we show the connections between different formulations of the Fluctuation Theorem. One formulation concerns the generating function of the currents while another one concerns the corresponding large deviation function, which we have calculated exactly for this model. A third formulation of FT concerns the ratio of the probability of making one forward step to the probability of making one backward step. The predictions of this last formulation of the Fluctuation Theorem adapted to our model are in very good agreement with the data of Carter and Cross [Nature, {\bf 435}, 308 (2005)] on single molecule measurements with kinesin. Finally, we show that all the formulations of FT can be understood from the notion of entropy production.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 20:30:14 GMT" }, { "version": "v2", "created": "Tue, 1 Jul 2008 12:40:59 GMT" } ]
2009-11-13T00:00:00
[ [ "Lacoste", "D.", "" ], [ "Lau", "A. W. C.", "" ], [ "Mallick", "K.", "" ] ]
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801.4153
Iva Koz\'akov\'a
Iva \v{S}pakulov\'a
Critical percolation of virtually free groups and other tree-like graphs
Published in at http://dx.doi.org/10.1214/09-AOP458 the Annals of Probability (http://www.imstat.org/aop/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Annals of Probability 2009, Vol. 37, No. 6, 2262-2296
10.1214/09-AOP458
IMS-AOP-AOP458
math.PR math.GR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This article presents a method for finding the critical probability $p_c$ for the Bernoulli bond percolation on graphs with the so-called tree-like structure. Such a graph can be decomposed into a tree of pieces, each of which has finitely many isomorphism classes. This class of graphs includes the Cayley graphs of amalgamated products, HNN extensions or general groups acting on trees. It also includes all transitive graphs with more than one end. The idea of the method is to find a multi-type Galton--Watson branching process (with a parameter $p$) which has finite expected population size if and only if the expected percolation cluster size is finite. This provides sufficient information about $p_c$. In particular, if the pairwise intersections of pieces are finite, then $p_c$ is the smallest positive $p$ such that $\operatorname {det}(M-1)=0$, where $M$ is the first-moment matrix of the branching process. If the pieces of the tree-like structure are finite, then $p_c$ is an algebraic number and we give an algorithm computing $p_c$ as a root of some algebraic function. We show that any Cayley graph of a virtually free group (i.e., a group acting on a tree with finite vertex stabilizers) with respect to any finite generating set has a tree-like structure with finite pieces. In particular, we show how to compute $p_c$ for the Cayley graph of a free group with respect to any finite generating set.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 20:38:05 GMT" }, { "version": "v2", "created": "Fri, 19 Feb 2010 15:56:06 GMT" } ]
2010-02-19T00:00:00
[ [ "Špakulová", "Iva", "" ] ]
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801.4154
Volker Braun
Volker Braun, Maximilian Kreuzer, Burt A. Ovrut, Emanuel Scheidegger
Worldsheet Instantons and Torsion Curves
9 pages. To appear in the proceedings of the first Sowers Theoretical Physics workshop, Virginia Tech, May 2007
null
null
null
hep-th
null
We study aspects of worldsheet instantons relevant to a heterotic standard model. The non-simply connected Calabi-Yau threefold used admits Z_3 x Z_3 Wilson lines, and a more detailed investigation shows that the homology classes of curves are H_2(X,Z)=Z^3+Z_3+Z_3. We compute the genus-0 prepotential, this is the first explicit calculation of the Gromov-Witten invariants of homology classes with torsion (finite subgroups). In particular, some curve classes contain only a single instanton. This ensures that the Beasley-Witten cancellation of instanton contributions cannot happen on this (non-toric) Calabi-Yau threefold.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 20:39:40 GMT" } ]
2008-01-29T00:00:00
[ [ "Braun", "Volker", "" ], [ "Kreuzer", "Maximilian", "" ], [ "Ovrut", "Burt A.", "" ], [ "Scheidegger", "Emanuel", "" ] ]
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801.4155
Malysheva Lyuba I.
Lyuba Malysheva and Alexander Onipko
Spectrum of $\pi$-electrons in Graphene As a Macromolecule
Revised in connection with publication in PRL, editing
null
10.1103/PhysRevLett.100.186806
null
cond-mat.mes-hall
null
We report the exact solution of spectral problem for a graphene sheet framed by two armchair- and two zigzag-shaped boundaries. The solution is found for the $\pi$ electron Hamiltonian and gives, in particular, a closed analytic expression of edge-state energies in graphene. It is shown that the lower symmetry of graphene, in comparison with $C_{6h}$ of 2D graphite, has a profound effect on the graphene band structure. This and other obtained results have far going implications for the understanding of graphene electronics. Some of them are briefly discussed.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 20:54:59 GMT" }, { "version": "v2", "created": "Tue, 29 Apr 2008 07:58:03 GMT" } ]
2009-11-13T00:00:00
[ [ "Malysheva", "Lyuba", "" ], [ "Onipko", "Alexander", "" ] ]
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801.4156
Davide Gabrielli
Davide Gabrielli
From combinatorics to large deviations for the invariant measures of some multiclass particle systems
30 pages
null
null
null
math.PR
null
We prove large deviation principles (LDP) for the invariant measures of the multiclass totally asymmetric simple exclusion process (TASEP) and the multiclass Hammersely-Aldous-Diaconis (HAD) process on a torus. The proof is based on a combinatorial representation of the measures in terms of a \emph{collapsing procedure} introduced in \cite{A} for the 2-class TASEP and then generalized in \cite{FM1}, \cite{FM2} and \cite{FM3} to the multiclass TASEP and the multiclass HAD process. The rate functionals are written in terms of variational problems that we solve in the cases of 2-class processes.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 21:13:46 GMT" } ]
2008-01-29T00:00:00
[ [ "Gabrielli", "Davide", "" ] ]
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801.4157
Lukasz Andrzej Glinka
L.A. Glinka
Multiparticle Quantum Cosmology
Notation was simplified, and gramatical errors was corrected. 6 pages in AIP latex format, submitted to Proceedings volume of Ninth International Symposium Frontiers of Fundamental and Computational Physics, Udine University, Udine, Italy and The International Center for Theoretical Physics, Trieste, Italy, January 7-9, 2008
AIP Conf.Proc.1018:94-99,2008
10.1063/1.2947716
null
gr-qc
null
Fock space quantization of Hamiltonian constraints of General Relativity and thermodynamics of quantum states for flat Friedmann-Lemaitre-Robertson-Walker metrics is presented.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 21:38:00 GMT" }, { "version": "v2", "created": "Mon, 4 Feb 2008 00:41:19 GMT" }, { "version": "v3", "created": "Tue, 5 Feb 2008 06:53:24 GMT" }, { "version": "v4", "created": "Fri, 8 Feb 2008 09:09:14 GMT" }, { "version": "v5", "created": "Wed, 27 Feb 2008 16:02:06 GMT" } ]
2011-04-11T00:00:00
[ [ "Glinka", "L. A.", "" ] ]
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801.4158
Gabor Vattay
Gabor Simon, Jozsef Steger, Peter Haga Istvan Csabai, Gabor Vattay
Measuring the Dynamical State of the Internet: Large Scale Network Tomography via the ETOMIC Infrastructure
null
null
null
null
physics.data-an cs.NI
null
In this paper we show how to go beyond the study of the topological properties of the Internet, by measuring its dynamical state using special active probing techniques and the methods of network tomography. We demonstrate this approach by measuring the key state parameters of Internet paths, the characteristics of queueing delay, in a part of the European Internet. In the paper we describe in detail the ETOMIC measurement platform that was used to conduct the experiments, and the applied method of queueing delay tomography. The main results of the paper are maps showing various spatial structure in the characteristics of queueing delay corresponding to the resolved part of the European Internet. These maps reveal that the average queueing delay of network segments spans more than two orders of magnitude, and that the distribution of this quantity is very well fitted by the log-normal distribution.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 21:53:36 GMT" } ]
2008-01-29T00:00:00
[ [ "Simon", "Gabor", "" ], [ "Steger", "Jozsef", "" ], [ "Csabai", "Peter Haga Istvan", "" ], [ "Vattay", "Gabor", "" ] ]
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801.4159
Robert Seiringer
Christian Hainzl, Robert Seiringer
Critical Temperature and Energy Gap for the BCS Equation
RevTeX4, 23 pages. Revised version, to appear in Phys. Rev. B
Phys. Rev. B 77, 184517 (2008)
10.1103/PhysRevB.77.184517
null
cond-mat.supr-con math-ph math.MP
null
We derive upper and lower bounds on the critical temperature $T_c$ and the energy gap $\Xi$ (at zero temperature) for the BCS gap equation, describing spin 1/2 fermions interacting via a local two-body interaction potential $\lambda V(x)$. At weak coupling $\lambda \ll 1$ and under appropriate assumptions on $V(x)$, our bounds show that $T_c \sim A \exp(-B/\lambda)$ and $\Xi \sim C \exp(-B/\lambda)$ for some explicit coefficients $A$, $B$ and $C$ depending on the interaction $V(x)$ and the chemical potential $\mu$. The ratio $A/C$ turns out to be a universal constant, independent of both $V(x)$ and $\mu$. Our analysis is valid for any $\mu$; for small $\mu$, or low density, our formulas reduce to well-known expressions involving the scattering length of $V(x)$.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 22:09:31 GMT" }, { "version": "v2", "created": "Fri, 23 May 2008 14:05:57 GMT" } ]
2009-11-13T00:00:00
[ [ "Hainzl", "Christian", "" ], [ "Seiringer", "Robert", "" ] ]
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801.416
Sergey Arsenjev
S.L. Arsenjev
The fluid motion physics: The interaction mechanics of a free liquid jet with a body and with the other free liquid jet
26 pages, 18 figures
null
null
null
physics.flu-dyn
null
Solution of a problem on the interaction mechanics of a free liquid jet with a flat plate, body and with other jet has been achieved by means of a graphic-analytical method, developed by author of the given article. This method has allowed physically adequately and visually to describe the flow field near the streamlined surface and to give expressions for quantitative evaluation of the jet pressure profile onto this surface. This method is equally correct for both a flat jet and a jet with a round cross-section. Analysis of the flow field has allowed to detect a jet component, induced by the body fore part in the unrestricted fluid stream and determining the body form drag. Besides that, it has been ascertained that a friction also induces the jet component in the potential boundary layer. It has been introduced a new notion of the stream total head vector, determining an origin of the possible jet flow in the stream.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 22:12:55 GMT" } ]
2008-01-29T00:00:00
[ [ "Arsenjev", "S. L.", "" ] ]
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801.4161
Johan Noldus
Johan Noldus
Generalized Gravity I : Kinematical Setting and reformalizing Quantum Field Theory
Minor improvements upon version 3
null
null
null
physics.gen-ph
null
The first part of this work deals with the development of a natural differential calculus on non-commutative manifolds. The second part extends the covariance and equivalence principle as well studies its kinematical consequences such as the arising of gauge theory. Furthermore, a manifestly causal and covariant formulation of quantum field theory is presented which surpasses the usual Hamiltonian and path integral construction. A particular representation of this theory on the kinematical structure developed in section three is moreover given.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 16:19:41 GMT" }, { "version": "v2", "created": "Mon, 28 Jan 2008 23:24:58 GMT" }, { "version": "v3", "created": "Thu, 17 Apr 2008 18:53:24 GMT" }, { "version": "v4", "created": "Sun, 20 Apr 2008 22:22:33 GMT" } ]
2008-04-21T00:00:00
[ [ "Noldus", "Johan", "" ] ]
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801.4162
Dubi Kelmer
Dubi Kelmer
Distribution of twisted Kloosterman sums modulo prime powers
8 pages. Two remarks added to the introduction
null
null
null
math.NT
null
In this note we study Kloosterman sums twisted by a multiplicative characters modulo a prime power. We show, by an elementary calculation, that these sums become equidistributed on the real line with respect to a suitable measure.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 22:46:15 GMT" }, { "version": "v2", "created": "Mon, 31 Mar 2008 22:48:05 GMT" } ]
2008-04-01T00:00:00
[ [ "Kelmer", "Dubi", "" ] ]
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801.4163
Tao Zhou
Zike Zhang, Linyuan Lv, Jian-Guo Liu, and Tao Zhou
Empirical analysis on a keyword-based semantic system
9 pages, 1 table and 4 figures
Eur. Phys. J. B 66, 557-561 (2008)
10.1140/epjb/e2008-00453-9
null
physics.data-an physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Keywords in scientific articles have found their significance in information filtering and classification. In this article, we empirically investigated statistical characteristics and evolutionary properties of keywords in a very famous journal, namely Proceedings of the National Academy of Science of the United States of America (PNAS), including frequency distribution, temporal scaling behavior, and decay factor. The empirical results indicate that the keyword frequency in PNAS approximately follows a Zipf's law with exponent 0.86. In addition, there is a power-low correlation between the cumulative number of distinct keywords and the cumulative number of keyword occurrences. Extensive empirical analysis on some other journals' data is also presented, with decaying trends of most popular keywords being monitored. Interestingly, top journals from various subjects share very similar decaying tendency, while the journals of low impact factors exhibit completely different behavior. Those empirical characters may shed some light on the in-depth understanding of semantic evolutionary behaviors. In addition, the analysis of keyword-based system is helpful for the design of corresponding recommender systems.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 22:48:48 GMT" }, { "version": "v2", "created": "Fri, 9 May 2008 16:37:08 GMT" }, { "version": "v3", "created": "Sat, 18 Oct 2008 14:48:19 GMT" }, { "version": "v4", "created": "Thu, 6 Nov 2008 14:46:00 GMT" } ]
2009-06-23T00:00:00
[ [ "Zhang", "Zike", "" ], [ "Lv", "Linyuan", "" ], [ "Liu", "Jian-Guo", "" ], [ "Zhou", "Tao", "" ] ]
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801.4164
Matthias Kaschube
Matthias Kaschube, Michael Schnabel, Siegrid L\"owel and Fred Wolf
Inter-areal coordination of columnar architectures during visual cortical development
30 pages, 1 table, 6 figures
null
10.1073/pnas.0901615106
null
q-bio.NC q-bio.QM
null
The occurrence of a critical period of plasticity in the visual cortex has long been established, yet its function in normal development is not fully understood. Here we show that as the late phase of the critical period unfolds, different areas of cat visual cortex develop in a coordinated manner. Orientation columns in areas V1 and V2 become matched in size in regions that are mutually connected. The same age trend is found for such regions in the left and right brain hemisphere. Our results indicate that a function of critical period plasticity is to progressively coordinate the functional architectures of different cortical areas - even across hemispheres.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 22:48:53 GMT" } ]
2015-05-13T00:00:00
[ [ "Kaschube", "Matthias", "" ], [ "Schnabel", "Michael", "" ], [ "Löwel", "Siegrid", "" ], [ "Wolf", "Fred", "" ] ]
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801.4165
William Danchi
R. K. Barry, W. C. Danchi, W. A. Traub, J. L. Sokoloski, J. P. Wisniewski, E. Serabyn, M. J. Kuchner, R. Akeson, E. Appleby, J. Bell, A. Booth, H. Brandenburg, M. Colavita, S. Crawford, M. Creech-Eakman, W. Dahl, C. Felizardo, J. Garcia, J. Gathright, M. A. Greenhouse, J.Herstein, E. Hovland, M. Hrynevych, C. Koresko, R. Ligon, B. Mennesson, R. Millan-Gabet, D. Morrison, D. Palmer, T. Panteleeva, S. Ragland, M. Shao, R. Smythe, K. Summers, M. Swain, K. Tsubota, C. Tyau, G. Vasisht, E. Wetherell, P. Wizinowich, J. Woillez
Milliarcsecond N-Band Observations of the Nova RS Ophiuchi: First Science with the Keck Interferometer Nuller
41 pages, 10 figures
null
10.1086/529422
null
astro-ph
null
We report observations of the nova RS Ophiuchi (RS Oph) using the Keck Interferometer Nuller (KIN), approximately 3.8 days following the most recent outburst that occurred on 2006 February 12. These observations represent the first scientific results from the KIN, which operates in N-band from 8 to 12.5 microns in a nulling mode. By fitting the unique KIN data, we have obtained an angular size of the mid-infrared continuum of 6.2, 4.0, or 5.4 mas for a disk profile, gaussian profile (FWHM), and shell profile respectively. The data show evidence of enhanced neutral atomic hydrogen emission and atomic metals including silicon located in the inner spatial regime near the white dwarf (WD) relative to the outer regime. There are also nebular emission lines and evidence of hot silicate dust in the outer spatial region, centered at ! 17 AU from the WD, that are not found in the inner regime. Our evidence suggests that these features have been excited by the nova flash in the outer spatial regime before the blast wave reached these regions. These identifications support a model in which the dust appears to be present between outbursts and is not created during the outburst event. We further discuss the present results in terms of a unifying model of the system that includes an increase in density in the plane of the orbit of the two stars created by a spiral shock wave caused by the motion of the stars through the cool wind of the red giant star. These data show the power and potential of the nulling technique which has been developed for the detection of Earth-like planets around nearby stars for the Terrestrial Planet Finder Mission and Darwin missions.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 22:50:53 GMT" } ]
2009-11-13T00:00:00
[ [ "Barry", "R. K.", "" ], [ "Danchi", "W. C.", "" ], [ "Traub", "W. A.", "" ], [ "Sokoloski", "J. L.", "" ], [ "Wisniewski", "J. P.", "" ], [ "Serabyn", "E.", "" ], [ "Kuchner", "M. J.", "" ], [ "Akeson", "R.", "" ], [ "Appleby", "E.", "" ], [ "Bell", "J.", "" ], [ "Booth", "A.", "" ], [ "Brandenburg", "H.", "" ], [ "Colavita", "M.", "" ], [ "Crawford", "S.", "" ], [ "Creech-Eakman", "M.", "" ], [ "Dahl", "W.", "" ], [ "Felizardo", "C.", "" ], [ "Garcia", "J.", "" ], [ "Gathright", "J.", "" ], [ "Greenhouse", "M. A.", "" ], [ "Herstein", "J.", "" ], [ "Hovland", "E.", "" ], [ "Hrynevych", "M.", "" ], [ "Koresko", "C.", "" ], [ "Ligon", "R.", "" ], [ "Mennesson", "B.", "" ], [ "Millan-Gabet", "R.", "" ], [ "Morrison", "D.", "" ], [ "Palmer", "D.", "" ], [ "Panteleeva", "T.", "" ], [ "Ragland", "S.", "" ], [ "Shao", "M.", "" ], [ "Smythe", "R.", "" ], [ "Summers", "K.", "" ], [ "Swain", "M.", "" ], [ "Tsubota", "K.", "" ], [ "Tyau", "C.", "" ], [ "Vasisht", "G.", "" ], [ "Wetherell", "E.", "" ], [ "Wizinowich", "P.", "" ], [ "Woillez", "J.", "" ] ]
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801.4166
Ian Affleck
Rodrigo G. Pereira, Nicolas Laflorencie, Ian Affleck and Bertrand I. Halperin
Kondo screening cloud and the charge staircase in one-dimensional mesoscopic devices
This is an extended version of cond-mat/0612635 with an analysis of bulk Luttinger liquid interactions added as well as a discussion of experimental possibilities
Phys. Rev. B 77, 125327 (2008)
10.1103/PhysRevB.77.125327
null
cond-mat.str-el cond-mat.mes-hall
null
We propose that the finite size of the Kondo screening cloud, xi_K, can be probed by measuring the charge quantization in a one-dimensional system coupled to a small quantum dot. When the chemical potential, mu in the system is varied at zero temperature, one should observe charge steps whose locations are at values of mu that are controlled by the Kondo effect when the system size L is comparable to xi_K. We show that, if the standard Kondo model is used, the ratio between the widths of the Coulomb blockade valleys with odd or even number of electrons is a universal scaling function of xi_K/L. If we take into account electron-electron interactions in a single-channel wire, this ratio also depends on the parameters of the effective Luttinger model; in addition, the scaling is weakly violated by a marginal bulk interaction. For the geometry of a quantum dot embedded in a ring, we show that the dependence of the charge steps on a magnetic flux through the ring is controlled by the size of the Kondo screening cloud.
[ { "version": "v1", "created": "Sun, 27 Jan 2008 23:54:54 GMT" } ]
2008-03-20T00:00:00
[ [ "Pereira", "Rodrigo G.", "" ], [ "Laflorencie", "Nicolas", "" ], [ "Affleck", "Ian", "" ], [ "Halperin", "Bertrand I.", "" ] ]
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801.4167
Nikolai Pogorelov
Nikolai V. Pogorelov, Jacob Heerikhuisen, Gary P. Zank
Probing Heliospheric Asymmetries with an MHD-kinetic Model
Paper accepted for publication in the Astrophysical Journal Letters
null
10.1086/529547
null
astro-ph
null
New solar wind data from the Voyager 1 and Voyager 2 spacecraft, together with the SOHO SWAN measurements of the direction that neutral hydrogen enters into the inner heliosheath and neutral helium measurements provided by multiple observations are expected to provide more reliable constraints on the ionization ratio of the local interstellar medium (LISM) and the direction and magnitude of the interstellar magnetic field (ISMF). In this paper we use currently the most sophisticated numerical model of the heliospheric interface, which is based on an MHD treatment of the ion flow and kinetic modeling of neutral particles, to analyze an ISMF-induced asymmetry of the heliosphere in the presence of the interplanetary magnetic field and neutral particles. It is shown that secondary hydrogen atoms modify the LISM properties leading to its shock-free deceleration at the heliopause. We determine the deflection of hydrogen atoms from their original trajectory in the unperturbed LISM and show that it occurs not only in the plane defined by the ISMF and LISM velocity vectors, but also, to a lesser extent, perpendicular to this plane. We also consider the possibility of using 2-3 kHz radio emission data to further constrain the ISMF direction.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 00:25:50 GMT" } ]
2009-11-13T00:00:00
[ [ "Pogorelov", "Nikolai V.", "" ], [ "Heerikhuisen", "Jacob", "" ], [ "Zank", "Gary P.", "" ] ]
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801.4168
Volker D. Burkert
Latifa Elouadrhiri
Deeply Virtual Compton Scattering with CLAS12
6 pages, 3 figures, talk presented at the Workshop on Deeply Exclusive Processes, Jefferson Lab, 2007
null
10.1142/9789812796950_0018
null
hep-ph
null
An overview is given about the capabilities provided by the JLab 12 GeV Upgrade to measure deeply virtual exclusive processes with high statistics and covering a large kinematics range in the parameters that are needed to allow reconstruction of a spatial image of the nucleon's quark structure. The measurements planned with CLAS12 will cross section asymmetries with polarized beams and with longitudinally and transversely polarized proton targets in the constrained kinematics $x = \pm \xi$. In addition, unpolarized DVCS cross sections, and doubly polarized beam target asymmetries will be measured as well. In this talk only the beam and target asymmetries will be discussed.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 00:08:17 GMT" } ]
2017-08-23T00:00:00
[ [ "Elouadrhiri", "Latifa", "" ] ]
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801.4169
Aiguo Xu Dr.
Yanbiao Gan, Aiguo Xu, Guangcai Zhang, Xijun Yu, Yingjun Li
Two-Dimensional Lattice Boltzmann Model For Compressible Flows With High Mach Number
null
Physica A 387, 1721 (2008)
10.1016/j.physa.2007.11.013
null
cond-mat.soft cond-mat.stat-mech
null
In this paper we present an improved lattice Boltzmann model for compressible Navier-Stokes system with high Mach number. The model is composed of three components: (i) the discrete-velocity-model by Watari and Tsutahara [Phys Rev E \textbf{67},036306(2003)], (ii) a modified Lax-Wendroff finite difference scheme where reasonable dissipation and dispersion are naturally included, (iii) artificial viscosity. The improved model is convenient to compromise the high accuracy and stability. The included dispersion term can effectively reduce the numerical oscillation at discontinuity. The added artificial viscosity helps the scheme to satisfy the von Neumann stability condition. Shock tubes and shock reflections are used to validate the new scheme. In our numerical tests the Mach numbers are successfully increased up to 20 or higher. The flexibility of the new model makes it suitable for tracking shock waves with high accuracy and for investigating nonlinear nonequilibrium complex systems.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 00:27:20 GMT" } ]
2009-11-13T00:00:00
[ [ "Gan", "Yanbiao", "" ], [ "Xu", "Aiguo", "" ], [ "Zhang", "Guangcai", "" ], [ "Yu", "Xijun", "" ], [ "Li", "Yingjun", "" ] ]
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801.417
Kenichi Sasaki
Ken-ichi Sasaki and Riichiro Saito
Magnetism as a mass term of the edge states in graphene
7 pages, 5 figures
J. Phys. Soc. Jpn. 77, 054703 (2008)
10.1143/JPSJ.77.054703
null
cond-mat.mes-hall cond-mat.mtrl-sci
null
The magnetism by the edge states in graphene is investigated theoretically. An instability of the pseudo-spin order of the edge states induces ferrimagnetic order in the presence of the Coulomb interaction. Although the next nearest-neighbor hopping can stabilize the pseudo-spin order, a strong Coulomb interaction makes the pseudo-spin unpolarized and real spin polarized. The magnetism of the edge states makes two peaks of the density of states in the conduction and valence energy bands near the Fermi point. Using a continuous model of the Weyl equation, we show that the edge-induced gauge field and the spin dependent mass terms are keys to make the magnetism of the edge states. A relationship between the magnetism of the edge states and the parity anomaly is discussed.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 01:12:47 GMT" } ]
2008-04-28T00:00:00
[ [ "Sasaki", "Ken-ichi", "" ], [ "Saito", "Riichiro", "" ] ]
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801.4171
Arnau Rios
Arnau Rios (1) and Pawel Danielewicz (1,2) ((1) National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University, USA, (2) Kavli Insitute for Theoretical Physics, University of California, Santa Barbara, USA)
Time-dependent Green's functions approach to nuclear reactions
6 pages, 3 figures, contribution to the "2nd Workshop on nuclei and mesoscopic physics", NSCL-MSU, October 20-22, 2007
AIPConf.Proc.995:98-103,2008
10.1063/1.2915626
null
nucl-th
null
Nonequilibrium Green's functions represent underutilized means of studying the time evolution of quantum many-body systems. In view of a rising computer power, an effort is underway to apply the Green's functions formalism to the dynamics of central nuclear reactions. As the first step, mean-field evolution for the density matrix for colliding slabs is studied in one dimension. The strategy to extend the dynamics to correlations is described.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 01:13:21 GMT" } ]
2008-11-26T00:00:00
[ [ "Rios", "Arnau", "" ], [ "Danielewicz", "Pawel", "" ] ]
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801.4172
Piero Barone
Piero Barone
Computational aspects and applications of a new transform for solving the complex exponentials approximation problem
28 pages, 20 figures
Digital Signal processing 20 (2010) 724-735
10.1016/j.dsp.2009.10.003
null
math.NA stat.AP stat.CO
null
Many real life problems can be reduced to the solution of a complex exponentials approximation problem which is usually ill posed. Recently a new transform for solving this problem, formulated as a specific moments problem in the plane, has been proposed in a theoretical framework. In this work some computational issues are addressed to make this new tool useful in practice. An algorithm is developed and used to solve a Nuclear Magnetic Resonance spectrometry problem, two time series interpolation and extrapolation problems and a shape from moments problem.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 16:37:16 GMT" } ]
2012-05-03T00:00:00
[ [ "Barone", "Piero", "" ] ]
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