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711.3508
Anh Vinh Le
Le Anh Vinh
Explicit Ramsey graphs and Erdos distance problem over finite Euclidean and non-Euclidean spaces
null
The Electronics Journal of Combinatorics, 15 (2008), R5
null
null
math.CO
null
We study the Erdos distance problem over finite Euclidean and non-Euclidean spaces. Our main tools are graphs associated to finite Euclidean and non-Euclidean spaces that are considered in Bannai-Shimabukuro-Tanaka (2004, 2007). These graphs are shown to be asymptotically Ramanujan graphs. The advantage of using these graphs is twofold. First, we can derive new lower bounds on the Erdos distance problems with explicit constants. Second, we can construct many explicit tough Ramsey graphs R(3,k).
[ { "version": "v1", "created": "Thu, 22 Nov 2007 06:00:46 GMT" } ]
2008-02-09T00:00:00
[ [ "Vinh", "Le Anh", "" ] ]
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711.3509
Jeff Tallon
N. Suresh, J.G. Storey, G.V.M. Williams and J.L. Tallon
Pressure dependence of the oxygen isotope effect in YBa$_2$Cu$_4$O$_8$
4 pages, 1 figures, submitted to Phys. Rev. B
null
10.1103/PhysRevB.78.100503
null
cond-mat.supr-con
null
We have carried out measurements of the pressure dependence to 1.2 GPa of the oxygen isotope effect on $T_c$ in the high-$T_c$ superconductor YBa$_2$Cu$_4$O$_8$ using a clamp cell in a SQUID magnetometer. This compound lies close to, but just above, the 1/8$^{th}$ doping point where in La$_{2-x}$Sr$_x$CuO$_4$ marked anomalies in isotope effects occur. Both isotopes show the same very large pressure dependence of $T_c$ with the result that the isotope exponent remains low ($\sim$0.08) but increases slightly with increasing pressure. This is discussed in terms of stripe suppression, a competing pseudogap and the effect of superconducting fluctuations.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 06:10:50 GMT" } ]
2009-11-13T00:00:00
[ [ "Suresh", "N.", "" ], [ "Storey", "J. G.", "" ], [ "Williams", "G. V. M.", "" ], [ "Tallon", "J. L.", "" ] ]
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711.351
Zhiqin Lu
Zhiqin Lu
Proof of the normal scalar curvature conjecture
null
null
null
null
math.DG
null
In this paper, we proved the normal scalar curvature conjecture and the Bottcher-Wenzel conjecture.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 06:15:44 GMT" } ]
2007-11-26T00:00:00
[ [ "Lu", "Zhiqin", "" ] ]
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711.3511
Reza Asgari
R. Asgari, M. M. Vazifeh, M. R. Ramezanali, E. Davoudi, B. Tanatar
Effect of disorder on the ground-state properties of graphene
Extended introduction and discussion. To appear in Phys. Rev. B
Phys. Rev. B 77, 125432 (2008)
10.1103/PhysRevB.77.125432
null
cond-mat.mes-hall cond-mat.dis-nn
null
We calculate the ground-state energy of Dirac electrons in graphene in the presence of disorder. We take randomly distributed charged impurities at a fixed distance from the graphene sheet and surface fluctuations (ripples) as the main scattering mechanisms. Mode-coupling approach to scattering rate and random-phase approximation for ground-state energy incorporating the many-body interactions and the disorder effects yields good agreement with experimental inverse compressibility.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 06:33:47 GMT" }, { "version": "v2", "created": "Tue, 5 Feb 2008 06:26:17 GMT" } ]
2009-11-13T00:00:00
[ [ "Asgari", "R.", "" ], [ "Vazifeh", "M. M.", "" ], [ "Ramezanali", "M. R.", "" ], [ "Davoudi", "E.", "" ], [ "Tanatar", "B.", "" ] ]
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711.3512
Ramakrishnan Balakrishnan
B. Ramakrishnan and Brundaban Sahu
Rankin-Cohen Brackets and van der Pol-Type Identities for the Ramanujan's Tau Function
14 pages
null
null
null
math.NT
null
We use Rankin-Cohen brackets for modular forms and quasimodular forms to give a different proof of the results obtained by D. Lanphier and D. Niebur on the van der Pol type identities for the Ramanujan's tau function. As consequences we obtain convolution sums and congruence relations involving the divisor functions.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 07:03:33 GMT" } ]
2007-11-26T00:00:00
[ [ "Ramakrishnan", "B.", "" ], [ "Sahu", "Brundaban", "" ] ]
[ 0.0243610628, -0.0226417445, -0.0014135955, 0.0189851634, -0.032037463, -0.0280660763, 0.0020901235, 0.0641233549, -0.0237193462, -0.0695961192, -0.0172900595, 0.0020053682, 0.0145900007, -0.0167088807, 0.0415542573, 0.014444706, 0.0360814966, -0.0154254446, 0.0159218684, 0.1605989784, -0.0390358195, -0.0833022445, -0.0004786398, 0.0255234204, 0.0437821113, -0.0156918187, -0.0768608525, -0.0316500105, 0.1055807546, -0.0946352258, 0.0206560511, -0.0453803502, -0.0022081754, -0.0683368966, -0.0150258848, 0.1101333126, -0.0491337962, 0.0310446154, -0.0616533458, -0.0003923711, -0.0944899321, 0.0262983255, -0.1393859684, -0.0182223655, -0.003335722, 0.1227255166, 0.0061356705, -0.0795245841, -0.0187672209, -0.0374860093, 0.0365173779, 0.0578756854, 0.0080154194, -0.021321984, -0.0692570955, 0.0802994892, -0.036008846, 0.1169137284, 0.0221937522, -0.0831569508, -0.0067743612, -0.1349302679, -0.0676588565, -0.0222058594, -0.1368675232, -0.0473660417, -0.1080023274, -0.0292526484, 0.0523544922, 0.0054122242, -0.0025971411, 0.0418448485, 0.1258251369, 0.0453803502, 0.0248695947, 0.0293010809, -0.0815102756, 0.1360926181, 0.0211403668, 0.009728685, 0.0852395073, 0.0643170848, 0.0595707893, 0.0077248299, 0.0162851047, 0.0309477523, -0.0249906722, 0.0563743077, -0.1067431048, 0.1064525172, 0.0313836373, -0.0273638181, -0.0289136283, 0.0133065647, 0.0466395691, -0.0552603826, -0.0142630879, 0.0007635534, 0.0289620589, 0.0995752439, 0.0177380498, 0.0251117516, 0.1138141155, 0.0173748136, 0.1680574268, 0.0692086667, 0.0470996685, -0.0388905257, -0.1452946067, -0.009982951, -0.1141047031, 0.0075492659, -0.0888718739, 0.0120352367, 0.0598129481, 0.059134908, -0.0188156515, 0.0244216025, -0.1048058495, -0.0135608306, 0.0725988746, -0.1063556522, 0.0771514401, 0.0143236266, 0.0534199849, -0.0596192218, 0.0302939266, -0.0923589393, -0.0163214281, -0.015292258, 0.0741486847, -0.0065745814, 0.104902707, 0.0475839861, -0.0678525865, 0.0170115773, 0.118076086, -0.0512405671, 0.0556962676, -0.0220605657, 0.0149290217, -0.0459373146, 0.0450897627, 0.0163456444, -0.0597645156, -0.0073615937, -0.0646076724, -0.0577303916, -0.0354760997, -0.027436465, -0.0227143914, -0.0869346112, 0.0516280197, -0.0123742577, -0.0449686833, -0.0881938264, -0.0128948968, 0.0392053276, 0.0424018092, -0.0141420085, -0.0199537929, 0.0135002909, 0.0007071761, -0.0174474604, 0.0409004316, -0.0200143326, -0.0015513226, 0.0025502231, -0.0149895605, -0.1515907049, 0.0637843311, -0.0247485153, -0.0540980287, 0.0065927431, 0.0355729647, 0.0144568142, -0.028719902, -0.0628641322, 0.0058753509, -0.0259350874, -0.0347496271, 0.0542433225, 0.0000660258, 0.0688696429, 0.0087358383, -0.0445812307, 0.0869346112, 0.0085178968, 0.1121674404, -0.0415058285, 0.0725988746, 0.1613738835, 0.1065493822, 0.0916324705, 0.0803963542, -0.1560464054, 0.0382367, 0.0943930671, -0.0281629395, -0.0091959378, -0.0484073199, -0.0661090463, -0.008499735, 0.0587958843, -0.0076400749, -0.0226901751, 0.0069075478, 0.0144083826, -0.0620407984, -0.0572460778, 0.0058692968, 0.0322554037, 0.1583711207, 0.0140451454, 0.0036686889, 0.0682884678, -0.1101333126, 0.0288894121, 0.0033145333, 0.178712368, -0.0368321836, 0.0838349909, 0.0110908216, -0.0453077033, 0.0642686486, 0.1274718046, 0.0521123335, 0.0071194358, -0.003036052, -0.0195300169, 0.0065624733, -0.0363478698, -0.0765702575, -0.0224480182, 0.0545823425, 0.0004680454, 0.0315531455, -0.0882906914, -0.100156419, -0.1560464054, 0.0029346484, 0.0751657486, 0.0058753509, -0.0253781248, -0.0036959318, 0.0596676543, 0.0264678355, 0.0802994892, 0.0044738632, -0.0734706447, -0.013246025, 0.0429103412, 0.0596192218, -0.024046259, -0.0925526693, 0.0930369794 ]
711.3513
Julien Roques
Julien Roques (DMA)
Galois groups of the Lie-irreducible generalized $q$-hypergeometric equations of order three with $q$-real parameters : an approach using a density theorem
null
null
null
null
math.CA
null
In this paper we compute the difference Galois groups of the Lie-irreducible regular singular generalized q-hypergeometric equations of order 3 with q-real parameters by using a density theorem due to Sauloy. In contrast with the differential case, we show that these groups automatically contain the special linear group SL(3,C).
[ { "version": "v1", "created": "Thu, 22 Nov 2007 07:10:22 GMT" } ]
2007-11-26T00:00:00
[ [ "Roques", "Julien", "", "DMA" ] ]
[ 0.0422694162, -0.0239494052, -0.0200333036, -0.0143182445, 0.0810632929, -0.0210979935, -0.0768534839, -0.0100656031, -0.1254131347, -0.0248305276, -0.037447717, -0.0680912063, -0.0854199529, 0.079252094, -0.0504198, 0.0398708023, 0.0659373477, -0.0110323904, 0.1169935167, 0.0705387667, -0.0110507477, -0.0420980863, 0.0466995053, -0.0432239659, 0.0048981858, 0.012800755, 0.0348532982, 0.0055284332, 0.0306679662, -0.0225665327, 0.1037766784, -0.0169860888, 0.0135594998, -0.0429792069, -0.122280255, 0.0721541569, -0.0953570604, 0.0977556705, -0.0722520649, 0.0687765256, 0.0580561981, -0.0031328809, -0.1161123961, -0.002655606, 0.0677485466, 0.0472869202, 0.0566855632, 0.070832476, -0.0361749828, -0.0221382082, -0.0285630617, 0.1487139314, -0.0241819229, 0.0218689758, -0.0150157996, -0.0688744262, -0.1208117157, 0.0447904058, 0.033629518, -0.1082801893, 0.0363218375, -0.121007517, -0.033188954, 0.0372519121, -0.1120983884, 0.0129598463, -0.0883080736, 0.0004329127, 0.0526226051, 0.1261963546, -0.163888827, 0.0645667166, 0.1071053594, -0.054825414, 0.0548743643, -0.0326504931, -0.0146364272, 0.0632939786, -0.0587904677, -0.0027718651, 0.0336539932, 0.0457449555, -0.009900393, 0.0221382082, -0.0723499656, -0.1007416993, 0.0152116045, 0.0420736112, -0.0618254431, 0.0453288704, -0.0175490268, -0.0793499947, -0.0238025505, -0.0140612498, 0.0603569075, -0.066867426, 0.0949654505, 0.1033850685, 0.0106346617, -0.0126294261, 0.0151871294, 0.0473603457, 0.0222361106, -0.0568813682, 0.1229655743, -0.0031971294, 0.0220525432, 0.055021219, -0.1226718649, -0.0269476697, -0.0131434137, 0.0469197854, -0.0242798254, -0.0221626833, 0.0825318247, 0.0810143426, -0.1320705116, -0.1493013501, -0.0679443553, 0.129916653, -0.0573219284, -0.0901192725, 0.0506645553, -0.0406540222, 0.0419757068, 0.0141224395, -0.016092727, -0.1569377482, -0.0152605558, 0.0128497062, 0.066867426, 0.0207063835, -0.0270455722, -0.0086215409, -0.0152727934, 0.012800755, 0.0851751938, -0.0304232091, -0.0018846235, 0.0084808059, 0.0205472931, 0.0409232564, -0.0163374841, 0.0046228347, 0.0139388721, 0.048388321, -0.0731331855, 0.0198864508, -0.015419648, 0.0258952174, 0.0348043479, -0.1144480482, 0.0471155904, -0.0286854394, -0.0816507041, -0.1075948775, 0.058007244, 0.0409477316, 0.1012312099, -0.0325525887, 0.0369092524, 0.015199367, -0.0243043024, -0.0556086339, -0.0439582318, 0.0126906149, -0.0839514136, -0.0317693688, -0.0104143806, -0.0770492852, -0.0951123014, -0.0147220921, -0.122280255, -0.0215385556, -0.0186626688, 0.0061495025, -0.0261889249, -0.0670632273, -0.0320630781, -0.0369582027, 0.0019121587, 0.0599652976, -0.0449617356, -0.062804468, 0.0290770493, 0.0367868729, 0.0515946299, -0.0829234347, 0.0527694598, 0.0703429654, -0.0264336821, 0.0565387085, 0.0499058105, 0.1079864874, 0.0614827871, -0.1150354668, -0.000509399, 0.0453533456, -0.0046809646, 0.0202413462, 0.0328462981, 0.0253812298, 0.0825318247, -0.0588883683, -0.0095760906, -0.0059689945, 0.0609932728, -0.1012312099, -0.1105319485, -0.0512519702, -0.031230906, -0.0830702931, 0.041216962, 0.0383288376, 0.0569792688, 0.0970214009, -0.0937416703, -0.0086154221, 0.0143304821, 0.2012875974, -0.0335560888, -0.0310840514, -0.0218200255, 0.0112343151, -0.0086766109, -0.0076853484, 0.0612380281, -0.0748954341, -0.0442764163, -0.0300315991, 0.1003500894, 0.0119563462, -0.0768045336, -0.0765108243, 0.0601121485, 0.0164353866, 0.0167658068, -0.0647135675, -0.0749443844, -0.0671611354, -0.0686296672, 0.0140734883, -0.0053754603, 0.0251364727, 0.0032001887, -0.0276819393, -0.0124213826, -0.0500771403, 0.0268497672, -0.0313777588, -0.1121962965, 0.0869863927, 0.025014095, 0.0289057195, -0.0983430892, 0.0928605422 ]
711.3514
Ryszard Szwarc
Ryszard Szwarc
The ratio and generating function of cogrowth coefficients of finitely generated groups
null
Studia Mathematica 131 (1998), 89-94
null
null
math.FA math.GR
null
Let G be a group generated by $r$ elements $g_1,g_2,..., g_r.$ Among the reduced words in $g_1,g_2,..., g_r$ of length $n$ some, say $\gamma_n,$ represent the identity element of the group $G.$ It has been shown in a combinatorial way that the $2n$th root of $\gamma_{2n}$ has a limit, called the cogrowth exponent with respect to generators $g_1,g_2,..., g_r.$ We show by analytic methods that the numbers $\gamma_n$ vary regularly; i.e. the ratio $\gamma_{2n+2}/\gamma_{2n}$ is also convergent. Moreover we derive new precise information on the domain of holomorphy of $\gamma(z),$ the generating function associated with the coefficients $\gamma_n.$
[ { "version": "v1", "created": "Thu, 22 Nov 2007 07:58:23 GMT" } ]
2007-11-26T00:00:00
[ [ "Szwarc", "Ryszard", "" ] ]
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711.3515
Kenji Bekki dr
Kenji Bekki, Masashi Chiba, and N. M. McClure-Griffiths
The Magellanic impact: Collision between the outer Galactic HI disk and the leading arms of the Magellanic stream
13pages, 4 figures, accepted by ApJL
null
10.1086/526456
null
astro-ph
null
We show that collisions between the outer Galactic HI disk and the leading arms (LAs) of the Magellanic stream (MS) can create giant HI holes and chimney-like structures in the disk. Based on the results of our N-body simulations on the last 2.5 Gyr evolution of the Large and Small Magellanic Clouds (LMC and SMC, respectively) interacting with the Galaxy, we investigate when and where the LAs can pass through the Galactic plane after the MS formation. We then investigate hydrodynamical interaction between LAs and the Galactic HI disk (``the Magellanic impact'') by using our new hydrodynamical simulations with somewhat idealized models of the LAs. We find that about 1-3% of the initial gas mass of the SMC, which consists of the LAs, can pass through the outer part (R=20-35 kpc) of the Galactic HI disk about 0.2 Gyr ago. We also find that the Magellanic impact can push out some fraction (~1%) of the outer Galactic HI disk to form 1-10 kpc-scale HI holes and chimney-like bridges between the LAs and the disk.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 08:07:02 GMT" } ]
2009-11-13T00:00:00
[ [ "Bekki", "Kenji", "" ], [ "Chiba", "Masashi", "" ], [ "McClure-Griffiths", "N. M.", "" ] ]
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711.3516
Dr. Rukmani Mohanta
R. Mohanta, A.K. Giri
Probing the unparticle signal in $b \to d $ penguin processes
12 pages, 4 figures, version to appear in Phys. Lett. B
Phys.Lett.B660:376-381,2008
10.1016/j.physletb.2008.01.009
null
hep-ph
null
We investigate the effect of unparticles in the pure $ b \to d $ penguin processes $ B^0 \to K^0 \bar K^0$ and $B^{+,0} \to \phi \pi^{+,0} $. Since these processes receive dominant contributions due to the {\it top} quark in the loop, direct and mixing-induced CP asymmetry parameters in these processes are expected to be vanishingly small in the standard model. We find that due to the unparticle effect sizable nonzero CP violation could be possible in these channels.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 08:10:51 GMT" }, { "version": "v2", "created": "Fri, 11 Jan 2008 04:18:18 GMT" } ]
2008-11-26T00:00:00
[ [ "Mohanta", "R.", "" ], [ "Giri", "A. K.", "" ] ]
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711.3517
Pablo Arrighi
Pablo Arrighi, Vincent Nesme, Reinhard Werner
One-dimensional quantum cellular automata over finite, unbounded configurations
9 pages, revtex, 8 figures
2nd Int. Conf. on Language and Automata Theory and Applications, LATA 2008, Spain. Proceedings to appear in LNCS.
null
null
quant-ph
null
One-dimensional quantum cellular automata (QCA) consist in a line of identical, finite dimensional quantum systems. These evolve in discrete time steps according to a local, shift-invariant unitary evolution. By local we mean that no instantaneous long-range communication can occur. In order to define these over a Hilbert space we must restrict to a base of finite, yet unbounded configurations. We show that QCA always admit a two-layered block representation, and hence the inverse QCA is again a QCA. This is a striking result since the property does not hold for classical one-dimensional cellular automata as defined over such finite configurations. As an example we discuss a bijective cellular automata which becomes non-local as a QCA, in a rare case of reversible computation which does not admit a straightforward quantization. We argue that a whole class of bijective cellular automata should no longer be considered to be reversible in a physical sense. Note that the same two-layered block representation result applies also over infinite configurations, as was previously shown for one-dimensional systems in the more elaborate formalism of operators algebras [9]. Here the proof is made simpler and self-contained, moreover we discuss a counterexample QCA in higher dimensions.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 18:20:31 GMT" } ]
2008-04-15T00:00:00
[ [ "Arrighi", "Pablo", "" ], [ "Nesme", "Vincent", "" ], [ "Werner", "Reinhard", "" ] ]
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711.3518
Eberhard Klempt
Eberhard Klempt
Exotic mesons: status and future
Pleanry talk at Hadron07, Frascati, Italy, October 8-12, 2007
null
null
null
hep-ph
null
The evidence for the existence of mesons with exotic quantum numbers and of hybrid candidates with non-exotic quantum numbers is critically reviewed, including candidates with hidden charm. Aims and methods of future searches for hybrid mesons are briefly discussed.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 08:38:46 GMT" } ]
2007-11-26T00:00:00
[ [ "Klempt", "Eberhard", "" ] ]
[ 0.0162292551, 0.0242008362, -0.015618057, 0.0074774208, 0.0182709154, 0.1505367458, -0.0677259266, 0.1772733927, 0.0602875203, 0.0668936595, -0.0170615241, -0.1065304875, -0.0032526781, 0.0415094383, -0.0083031887, 0.0387525484, -0.0204946361, 0.0575306267, 0.0785974488, -0.006180251, -0.0423677154, -0.0479855351, 0.0469451994, 0.0764647573, -0.0570624731, -0.0039955438, -0.0265545975, -0.0254102275, 0.0851515681, 0.0147077618, 0.1683264971, -0.0539414659, -0.0274648927, -0.0498581417, -0.0359696448, 0.1091313362, -0.021300897, 0.0427318364, -0.060443569, -0.059871383, -0.0101562878, -0.0585709624, -0.048791796, 0.1147491485, 0.0173866283, -0.0567503721, -0.0537333973, -0.0479075126, 0.0194803067, 0.0082121585, -0.0827587917, -0.0276469514, 0.0149288336, 0.0936303139, -0.1022130921, -0.0562822223, -0.0147337699, -0.0505343601, -0.0154490015, 0.0291554388, -0.0014914203, -0.0836430788, -0.0061249831, 0.1734241545, -0.0937863663, 0.0612238236, -0.0506123863, 0.0799498856, -0.0100132423, 0.0216650143, 0.0398969166, 0.0443443581, 0.079169631, 0.0254882518, -0.0346432179, -0.0906653553, 0.1135007441, 0.0084007196, -0.0494680144, 0.0282711536, -0.0389346071, 0.0504303277, -0.0850475356, -0.0280890949, 0.0262294915, 0.0117362998, 0.0274128746, -0.0065736282, -0.1466874927, 0.0228874106, -0.0090964455, -0.0607556701, -0.0661134049, -0.011924861, 0.1098595709, -0.0072628516, 0.0532132275, -0.0174516495, -0.0310800634, 0.0301177502, -0.029519558, -0.0362037197, 0.0264505632, -0.0157611035, 0.1659337282, -0.1437745541, -0.0126791047, -0.0164113138, 0.0305598937, 0.0091419602, -0.0281671192, -0.0010842261, -0.0920698121, 0.0186220296, -0.0196233541, -0.0704308003, -0.0687142462, -0.0331087187, -0.0241878312, 0.1249444559, -0.0792736635, 0.1074667946, 0.06590534, 0.0214829557, 0.0596633181, -0.1314985752, -0.0027829011, -0.0586229786, -0.0614839047, -0.068974331, 0.0653851703, -0.0209627878, 0.0070742904, -0.0175036676, -0.1050740182, 0.023017453, 0.0639807135, -0.014772783, 0.0603395365, -0.0080235973, 0.0818745047, -0.0526410416, 0.0708989576, 0.0587270148, -0.0076074628, 0.0595072657, 0.0560221374, 0.0589350797, 0.0919137597, -0.0413793959, -0.0634605438, -0.054253567, 0.0464770459, 0.0874923244, -0.0175036676, -0.123800084, -0.0092394911, -0.0140965637, -0.0302217845, -0.0558140725, 0.023017453, 0.04314797, 0.045696795, -0.00166779, 0.1102757007, 0.0628883615, -0.0977396443, 0.0550858341, -0.0839031637, -0.0239147432, 0.0596633181, -0.0548777692, 0.0308980029, 0.0052276924, -0.0673097894, -0.0176987294, -0.0521208756, -0.0701707155, -0.07610064, -0.0323544741, 0.0596113019, 0.1120442748, 0.0424457416, 0.0149288336, -0.0543055832, -0.0758925751, -0.0560741536, 0.0153579721, -0.008654302, 0.0215219688, -0.0072628516, 0.0850475356, 0.1121483073, 0.0247210041, 0.0566983558, -0.1079869643, 0.0447084755, 0.0788575336, 0.0115542412, -0.0302738007, 0.0316522494, 0.0047270306, 0.1194306687, -0.0059819366, 0.0616919734, 0.0491038971, 0.1169338599, -0.0111316042, -0.1162056252, -0.0288953558, 0.0895209834, 0.0303258188, -0.0019051168, 0.0986239314, -0.0314701907, -0.0259824116, -0.1165177226, -0.0191031843, 0.0128806699, 0.0652811378, -0.0790655985, 0.0819785446, 0.0471792743, 0.0698065981, -0.0216520093, -0.0360996872, -0.0530831851, -0.0488698222, -0.0536293648, -0.0349813253, -0.001015954, -0.041691497, 0.0100587569, -0.0766208097, -0.0683501288, -0.016476335, -0.0404170863, -0.0581028126, -0.01785478, -0.0099287145, -0.0322244316, -0.021300897, 0.1002884731, 0.0188431013, 0.0191161893, 0.0419255756, -0.0450986028, 0.0212488789, 0.0516527221, -0.1586513668, -0.0205726605, 0.1554263234, 0.0708469376, 0.0517567582, -0.0170745272, 0.0642928183 ]
711.3519
Pulak Ranjan Giri
Pulak Ranjan Giri, S. K. Chakrabarti
Quantization of exciton in magnetic field background
5 pages, 1 figure
Mod.Phys.Lett. A24:321-329, 2009
10.1142/S0217732309028175
SINP/TNP/2007/32
quant-ph hep-th math-ph math.MP
null
The possible mismatch between the theoretical and experimental absorption of the edge peaks in semiconductors in a magnetic field background may arise due to the approximation scheme used to analytically calculate the absorption coefficient. As a possible remedy we suggest to consider nontrivial boundary conditions on x-y plane by in-equivalently quantizing the exciton in background magnetic field. This inequivalent quantization is based on von Neumann's method of self-adjoint extension, which is characterized by a parameter \Sigma. We obtain bound state solution and scattering state solution, which in general depend upon the self-adjoint extension parameter \Sigma. The parameter \Sigma can be used to fine tune the optical absorption coefficient K(\Sigma) to match with the experiment.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 08:59:55 GMT" } ]
2009-02-26T00:00:00
[ [ "Giri", "Pulak Ranjan", "" ], [ "Chakrabarti", "S. K.", "" ] ]
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711.352
DaeKil Park
Eylee Jung, Mi-Ra Hwang, DaeKil Park, Jin-Woo Son, S. Tamaryan
Perfect Quantum Teleportation and Superdense coding with $P_{max} = 1/2$ states
9 pages, no figure, V2: 11 pages. Prove that two general 3-qubit states, which allow the perfect quantum teleportation, have $P_{max} = 1/2$
null
null
null
quant-ph
null
We conjecture that criterion for perfect quantum teleportation is that the Groverian entanglement of the entanglement resource is $1/\sqrt{2}$. In order to examine the validity of our conjecture we analyze the quantum teleportation and superdense coding with $|\Phi> = (1/\sqrt{2}) (|00q_1> + |11q_2>)$, where $|q_1>$ and $|q_2>$ are arbitrary normalized single qubit states. It is shown explicitly that $|\Phi>$ allows perfect two-party quantum teleportation and superdense coding scenario. Next we compute the Groverian measures for $|\psi>=\sqrt{1/2 - b^2}|100>+b |010>+a|001> +\sqrt{1/2-a^2}|111>$ and $|\tilde{\psi}>=a|000>+b|010>+\sqrt{1/2 - (a^2+b^2)}|100> + (1/\sqrt{2}) |111>$, which also allow the perfect quantum teleportation. It is shown that both states have $1/\sqrt{2}$ Groverian entanglement measure, which strongly supports that our conjecture is valid.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 08:57:19 GMT" }, { "version": "v2", "created": "Thu, 8 May 2008 13:27:34 GMT" } ]
2008-05-08T00:00:00
[ [ "Jung", "Eylee", "" ], [ "Hwang", "Mi-Ra", "" ], [ "Park", "DaeKil", "" ], [ "Son", "Jin-Woo", "" ], [ "Tamaryan", "S.", "" ] ]
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711.3521
Michael R. Pennington
M.R. Pennington and D.J. Wilson
How adding zero to the complex relation between production and scattering amplitudes found by van Beveren and Rupp gives the expected real relation
3 pages, 1 figure
null
null
DCPT/07/188, IPPP/07/92
hep-ph
null
If a hadronic production process is dominated by two body final state interactions, the amplitude $A$ for the production process can be expanded as a sum of the scattering amplitudes $T$ for the relevant two body channels. Van Beveren and Rupp have claimed that the unitarity relation ${\rm {Im}} A= T^\dag A$ can be satisfied if the coefficients in this expansion are complex. We demonstrate that the coefficients have to be real if the scattering amplitudes $T$ satisfy unitarity. Van Beveren and Rupp have merely written real coefficients as a sum of complex numbers.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 08:57:22 GMT" } ]
2007-11-26T00:00:00
[ [ "Pennington", "M. R.", "" ], [ "Wilson", "D. J.", "" ] ]
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711.3522
Akaki Rusetsky
J. Gasser (Bern U.), V.E. Lyubovitskij (Tuebingen U.), A. Rusetsky (Bonn U., HISKP)
Hadronic atoms in QCD + QED
140 pages, 19 postscript figures, the replaced version contains an additional reference
Phys.Rept.456:167-251,2008
10.1016/j.physrep.2007.09.006
HISKP-TH-07-20
hep-ph hep-ex nucl-ex nucl-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We review the theory of hadronic atoms in QCD + QED, based on a non-relativistic effective Lagrangian framework. We first provide an introduction to the theory, and then describe several applications: meson-meson, meson-nucleon atoms and meson-deuteron compounds. Finally, we compare the quantum field theory framework used here with the traditional approach, which is based on quantum-mechanical potential scattering.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 09:02:29 GMT" }, { "version": "v2", "created": "Wed, 11 Mar 2009 16:57:10 GMT" } ]
2009-03-11T00:00:00
[ [ "Gasser", "J.", "", "Bern U." ], [ "Lyubovitskij", "V. E.", "", "Tuebingen U." ], [ "Rusetsky", "A.", "", "Bonn U., HISKP" ] ]
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711.3523
Juan Carlos Morales
J.C. Morales, I. Ribas, C. Jordi
The effect of activity on stellar temperatures and radii
8 pages, 6 figures, accepted for publication in A&A
null
10.1051/0004-6361:20078324
null
astro-ph
null
Recent analyses of low-mass eclipsing binary stars have unveiled a significant disagreement between the observations and the predictions of stellar structure models. Results show that theoretical models underestimate the radii and overestimate the effective temperatures of low-mass stars but yield luminosities that accord with observations. A hypothesis based upon the effects of stellar activity was put forward to explain the discrepancies. In this paper we study the existence of the same trend in single active stars and provide a consistent scenario to explain systematic differences between active and inactive stars in the H-R diagram reported earlier. The analysis is done using single field stars of spectral types late-K and M and computing their bolometric magnitudes and temperatures through infrared colours and spectral indices. The properties of the stars in samples of active and inactive stars are compared statistically to reveal systematic differences. After accounting for a number of possible bias effects, active stars are shown to be cooler than inactive stars of similar luminosity therefore implying a larger radius as well, in proportions that are in excellent agreement with those found from eclipsing binaries. The present results generalise the existence of strong radius and temperature dependences on stellar activity to the entire population of low-mass stars, regardless of their membership in close binary systems.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 09:14:51 GMT" } ]
2009-11-13T00:00:00
[ [ "Morales", "J. C.", "" ], [ "Ribas", "I.", "" ], [ "Jordi", "C.", "" ] ]
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711.3524
Rafal Moderski
M. Sikora (1), R. Moderski (1), G. M. Madejski (2 and 3) ((1) Nicolaus Copernicus Astronomical Center, (2) Stanford Linear Accelerator Center, (3) Kavli Institute for Particle Astrophysics and Cosmology)
3C454.3 reveals the structure and physics of its 'blazar zone'
19 pages, 3 figures, accepted for publication in ApJ
Astrophys.J.675:71-78,2008
10.1086/526419
null
astro-ph
null
Recent multi-wavelength observations of 3C454.3, in particular during its giant outburst in 2005, put severe constraints on the location of the 'blazar zone', its dissipative nature, and high energy radiation mechanisms. As the optical, X-ray, and millimeter light-curves indicate, significant fraction of the jet energy must be released in the vicinity of the millimeter-photosphere, i.e. at distances where, due to the lateral expansion, the jet becomes transparent at millimeter wavelengths. We conclude that this region is located at ~10 parsecs, the distance coinciding with the location of the hot dust region. This location is consistent with the high amplitude variations observed on ~10 day time scale, provided the Lorentz factor of a jet is ~20. We argue that dissipation is driven by reconfinement shock and demonstrate that X-rays and gamma-rays are likely to be produced via inverse Compton scattering of near/mid IR photons emitted by the hot dust. We also infer that the largest gamma-to-synchrotron luminosity ratio ever recorded in this object - having taken place during its lowest luminosity states - can be simply due to weaker magnetic fields carried by a less powerful jet.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 09:06:16 GMT" } ]
2010-11-11T00:00:00
[ [ "Sikora", "M.", "", "2 and 3" ], [ "Moderski", "R.", "", "2 and 3" ], [ "Madejski", "G. M.", "", "2 and 3" ] ]
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711.3525
Debasish Chatterjee
Debasish Chatterjee and Daniel Liberzon
Towards ISS disturbance attenuation for randomly switched systems
6 pages, to appear in the Proceedings of the 46th IEEE Conference on Decision & Control, 2007
Proceedings of the 46th IEEE Conference on Decision and Control, New Orleans, LA, Dec 2007, pp. 5612-5617
10.1109/CDC.2007.4434163
null
math.OC
null
We are concerned with input-to-state stability (ISS) of randomly switched systems. We provide preliminary results dealing with sufficient conditions for stochastic versions of ISS for randomly switched systems without control inputs, and with the aid of universal formulae we design controllers for ISS-disturbance attenuation when control inputs are present. Two types of switching signals are considered: the first is characterized by a statistically slow-switching condition, and the second by a class of semi-Markov processes.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 09:09:22 GMT" } ]
2010-09-08T00:00:00
[ [ "Chatterjee", "Debasish", "" ], [ "Liberzon", "Daniel", "" ] ]
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711.3526
Kiyoshi Tamaki
Kiyoshi Tamaki
Unconditionally secure quantum key-distribution with relatively strong signal pulse
4 pages
Phys. Rev. A 77, 032341 (2008)
10.1103/PhysRevA.77.032341
null
quant-ph
null
We propose an unconditionally secure quantum key distribution (QKD) protocol, which uses a relatively strong signal pulse. While our protocol shares similar security bases as the Bennett 1992 protocol with a strong reference pulse (B92), our scheme uses a smaller number of detectors and it is robust against Rayleigh scattering in an optical fibre. We derive a lower bound of secret key generation rate of our protocol and show that our protocol can cover relatively long distances, assuming precise phase modulations and stable interferometers.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 09:13:32 GMT" } ]
2009-11-13T00:00:00
[ [ "Tamaki", "Kiyoshi", "" ] ]
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711.3527
Antonio Siber
Antonio Siber
Icosadeltahedral geometry of fullerenes, viruses and geodesic domes
null
null
null
null
physics.pop-ph cond-mat.soft physics.bio-ph q-bio.BM
null
I discuss the symmetry of fullerenes, viruses and geodesic domes within a unified framework of icosadeltahedral representation of these objects. The icosadeltahedral symmetry is explained in details by examination of all of these structures. Using Euler's theorem on polyhedra, it is shown how to calculate the number of vertices, edges, and faces in domes, and number of atoms, bonds and pentagonal and hexagonal rings in fullerenes. Caspar-Klug classification of viruses is elaborated as a specific case of icosadeltahedral geometry.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 09:39:19 GMT" } ]
2007-11-26T00:00:00
[ [ "Siber", "Antonio", "" ] ]
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711.3528
Jihn E. Kim
Ji-Haeng Huh, Jihn E. Kim, Jong-Chul Park, and Seong Chan Park
Galactic 511 keV line from MeV millicharged dark matter
14 pages, 3 figures; To appear in Phys. Rev. D
Phys.Rev.D77:123503,2008
10.1103/PhysRevD.77.123503
SNUTP 07-015
astro-ph hep-ph
null
We present a possible explanation of the recently observed 511 keV $\gamma$-ray anomaly with a new ``millicharged'' fermion. The new fermion is light (${\cal O}({\rm MeV})$) but has never been observed by any collider experiments mainly because of its tiny electromagnetic charge $\epsilon e$. We show that constraints from its relic density in the Universe and collider experiments allow a parameter range such that the 511 keV cosmic $\gamma$-ray emission from the galactic bulge may be due to positron production from this millicharged fermion.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 09:42:23 GMT" }, { "version": "v2", "created": "Sat, 24 Nov 2007 02:01:11 GMT" }, { "version": "v3", "created": "Sat, 1 Dec 2007 23:40:42 GMT" }, { "version": "v4", "created": "Sun, 25 May 2008 05:29:17 GMT" } ]
2008-11-26T00:00:00
[ [ "Huh", "Ji-Haeng", "" ], [ "Kim", "Jihn E.", "" ], [ "Park", "Jong-Chul", "" ], [ "Park", "Seong Chan", "" ] ]
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711.3529
Hank Miller
R. C. Andrew and H. G. Miller
A short note on the presence of spurious states in finite basis approximations
null
null
10.1088/1751-8113/41/15/158001
null
quant-ph math-ph math.MP
null
The genesis of spurious solutions in finite basis approximations to operators which possess a continuum and a point spectrum is discussed and a simple solution for identifying these solutions is suggested.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 10:06:37 GMT" } ]
2009-11-13T00:00:00
[ [ "Andrew", "R. C.", "" ], [ "Miller", "H. G.", "" ] ]
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711.353
Dmitrii Fil
D. V. Fil, S. I. Shevchenko
Bose-Einstein condensation in a decorated lattice: an application to supersolid
7 pages
Low Temp. Phys. 34, 351 (2008)
10.1063/1.2911654
null
cond-mat.stat-mech
null
The Bose-Einstein condensation of vacancies in a three-dimensional decorated lattice is considered. The model describes possible scenario of superfluidity of solid helium, caused by the presence of zero-point vacancies in a dislocation network. It is shown that the temperature of Bose-Einstein condensation decreases under increase of the length of the segments of the network, and the law of decrease depends essentially on the properties of the vertexes of the network. If the vertexes correspond to barriers with a small transparency, the critical temperature is inversely as the square of the length of the segment. On the contrary, if the vertexes correspond to traps for the vacancies (it is energetically preferable for the vacancies to localize at the vertexes), an exponential lowering of the temperature of transition takes place. The highest temperature of Bose-Einstein condensation is reached in the intermediate case of vertexes with large transparency, but in the absence of tendency of localization in them. In the latter case the critical temperature is inversely as the length of the segment.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 10:08:24 GMT" } ]
2009-11-13T00:00:00
[ [ "Fil", "D. V.", "" ], [ "Shevchenko", "S. I.", "" ] ]
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711.3531
Andrzej Kup\'s\'c Dr
CELSIUS/WASA Collaboration: M. Ber{\l}owski, Chr. Bargholtz, M. Bashkanov, D. Bogoslawsky, A. Bondar, H. Cal\'en, F. Cappellaro, H. Clement, L. Demir\"ors, C. Ekstr\"om, K. Fransson, L. Ger\'en, L. Gustafsson, B. H\"oistad, G. Ivanov, M. Jacewicz, E. Jiganov, T. Johansson, S. Keleta, I. Koch, S. Kullander, A. Kup\'s\'c, A. Kuzmin, A. Kuznetsov, I.V. Laukhin, K. Lindberg, P. Marciniewski, R. Meier, B. Morosov, W. Oelert, C. Pauly, H. Pettersson, Y. Petukhov, A. Povtorejko, R.J.M.Y. Ruber, K. Sch\"onning, W. Scobel, R. Shafigullin, B. Shwartz, T. Skorodko, V. Sopov, J. Stepaniak, P.-E. Tegn\'er, P. Th\"orngren Engblom, V. Tikhomirov, A. Turowiecki, G.J. Wagner, M. Wolke, A. Yamamoto, J. Zabierowski, I. Zartova, J. Z{\l}oma\'nczuk
Measurement of eta meson decays into lepton-antilepton pairs
9 pages, 10 Postscript figures, uses revtex4.sty, revised version after referee comments; conclusions unchanged
null
10.1103/PhysRevD.77.032004
null
hep-ex
null
A search for rare lepton decays of the eta meson was performed using the WASA detector at CELSIUS. Two candidates for double Dalitz decay eta->e+e-e+e- events are reported with a background of 1.3+/-0.2 events. This allows to set an upper limit to the branching ratio of 9.7E-5 (90% CL). The branching ratio for the decay eta->e+e-gamma is determined to (7.8+/-0.5 stat+/-0.8 syst)E-3. An upper limit (90% CL) for the branching ratio for the eta->e+e- decay is 2.7E-5 and a limit for the sum of the eta->mu+mu-mu+mu- and eta->pi+pi-mu+mu- decays is 3.6E-4.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 20:47:49 GMT" }, { "version": "v2", "created": "Sat, 24 Nov 2007 17:53:38 GMT" }, { "version": "v3", "created": "Wed, 16 Jan 2008 20:59:02 GMT" } ]
2013-05-29T00:00:00
[ [ "WASA Collaboration", "", "" ], [ "Berłowski", "M.", "" ], [ "Bargholtz", "Chr.", "" ], [ "Bashkanov", "M.", "" ], [ "Bogoslawsky", "D.", "" ], [ "Bondar", "A.", "" ], [ "Calén", "H.", "" ], [ "Cappellaro", "F.", "" ], [ "Clement", "H.", "" ], [ "Demirörs", "L.", "" ], [ "Ekström", "C.", "" ], [ "Fransson", "K.", "" ], [ "Gerén", "L.", "" ], [ "Gustafsson", "L.", "" ], [ "Höistad", "B.", "" ], [ "Ivanov", "G.", "" ], [ "Jacewicz", "M.", "" ], [ "Jiganov", "E.", "" ], [ "Johansson", "T.", "" ], [ "Keleta", "S.", "" ], [ "Koch", "I.", "" ], [ "Kullander", "S.", "" ], [ "Kupść", "A.", "" ], [ "Kuzmin", "A.", "" ], [ "Kuznetsov", "A.", "" ], [ "Laukhin", "I. V.", "" ], [ "Lindberg", "K.", "" ], [ "Marciniewski", "P.", "" ], [ "Meier", "R.", "" ], [ "Morosov", "B.", "" ], [ "Oelert", "W.", "" ], [ "Pauly", "C.", "" ], [ "Pettersson", "H.", "" ], [ "Petukhov", "Y.", "" ], [ "Povtorejko", "A.", "" ], [ "Ruber", "R. J. M. Y.", "" ], [ "Schönning", "K.", "" ], [ "Scobel", "W.", "" ], [ "Shafigullin", "R.", "" ], [ "Shwartz", "B.", "" ], [ "Skorodko", "T.", "" ], [ "Sopov", "V.", "" ], [ "Stepaniak", "J.", "" ], [ "Tegnér", "P. -E.", "" ], [ "Engblom", "P. Thörngren", "" ], [ "Tikhomirov", "V.", "" ], [ "Turowiecki", "A.", "" ], [ "Wagner", "G. J.", "" ], [ "Wolke", "M.", "" ], [ "Yamamoto", "A.", "" ], [ "Zabierowski", "J.", "" ], [ "Zartova", "I.", "" ], [ "Złomańczuk", "J.", "" ] ]
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711.3532
Horatiu Stefan Nastase
Katsushi Ito, Horatiu Nastase and Koh Iwasaki
Gluon scattering in ${\cal N}=4$ Super Yang-Mills at finite temperature
33 pages, 9 figures; clarifications of some points added, reference added
Prog.Theor.Phys.120:99-128,2008
10.1143/PTP.120.99
null
hep-th
null
We extend the AdS/CFT prescription of Alday and Maldacena to finite temperature $T$, defining the amplitude for gluon scattering in ${\cal N}=4$ Super Yang-Mills at strong coupling from string theory. It is defined by a lightlike ''Wilson loop'' living at the horizon of the T-dual to the black hole in AdS space. Unlike the zero temperature case, this is different from the Wilson loop contour defined at the boundary of the AdS black hole metric, thus at finite $T$ there is no relation between gluon scattering amplitudes and the Wilson loop. We calculate the amplitude at strong coupling for forward scattering of a low energy gluon ($E<T$) off a high energy gluon ($E\gg T$) in both cut-off and generalized dimensional regularization. The generalized dimensional regularization is defined in string theory as an IR modified dimensional reduction. For this calculation, the corresponding usual Wilson loop is related to the jet quenching parameter of the finite temperature ${\cal N}=4$ SYM plasma, while the gluon scattering amplitude is related to the viscosity coefficient.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 10:16:59 GMT" }, { "version": "v2", "created": "Fri, 18 Jan 2008 05:02:39 GMT" } ]
2008-11-26T00:00:00
[ [ "Ito", "Katsushi", "" ], [ "Nastase", "Horatiu", "" ], [ "Iwasaki", "Koh", "" ] ]
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711.3533
Evelina Viada
Viada Evelina
Non-dense sets of subvarieties in a power of an elliptic curve
34 pages
International Mathematics Reserch Notices, Vol 2009, n. 7, 1213-1246
10.1093/imrn/rnn157
null
math.NT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let V be an algebraic variety embedded in a power of an elliptic curve, both defined over the algebraic numbers. We show that the set of algebraic points of V which are of bounded height and which satisfy certain algebraic conditions are a non-dense subset of V. This result has implications in the context of the Pink-Zilber Conjecture and Mordel-Lang plus Bogomolov Theorem.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 10:23:57 GMT" }, { "version": "v2", "created": "Mon, 7 Jan 2008 15:21:21 GMT" }, { "version": "v3", "created": "Mon, 14 Jan 2008 13:22:46 GMT" }, { "version": "v4", "created": "Mon, 10 Nov 2008 12:47:03 GMT" }, { "version": "v5", "created": "Tue, 19 May 2009 12:56:59 GMT" } ]
2009-05-19T00:00:00
[ [ "Evelina", "Viada", "" ] ]
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711.3534
Annalisa Calamida
A. Calamida, G. Bono (OAR/INAF), P. B. Stetson (HIA/NRC), L. M. Freyhammer (Univ. Lancashire), S. Cassisi (OACTe/INAF), F. Grundahl (Aarhus Univ.), A. Pietrinferni (OACTe/INAF), M. Hilker, F. Primas (ESO), T. Richtler (Univ. Concepcion), M. Romaniello (ESO), R. Buonanno (Univ. Rome), F. Caputo, M. Castellani, C. E. Corsi, I. Ferraro, G. Iannicola, L. Pulone (OAR/INAF)
Stroemgren metallicity calibration: the m1, b-y relation
3 pages, 2 figures; to appear in Mem. Soc. Astr. Italiana, Vol. 79/2 (proceeding Cefalu' Workshop "XXI Century Challenges for Stellar Evolution", ed. S. Cassisi & M. Salaris)
null
null
null
astro-ph
null
We performed a new calibration of the Stroemgren metallicity index m1 based on the b-y color of cluster red giant stars. The current Metallicity-Index-Color relation is not linear in the color range 0.40 < b-y < 1.0, but provides iron abundances of cluster and field red giants with an accuracy of ~ 0.25 dex.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 10:24:15 GMT" } ]
2007-11-26T00:00:00
[ [ "Calamida", "A.", "", "OAR/INAF" ], [ "Bono", "G.", "", "OAR/INAF" ], [ "Stetson", "P. B.", "", "HIA/NRC" ], [ "Freyhammer", "L. M.", "", "Univ. Lancashire" ], [ "Cassisi", "S.", "", "OACTe/INAF" ], [ "Grundahl", "F.", "", "Aarhus\n Univ." ], [ "Pietrinferni", "A.", "", "OACTe/INAF" ], [ "Hilker", "M.", "", "ESO" ], [ "Primas", "F.", "", "ESO" ], [ "Richtler", "T.", "", "Univ. Concepcion" ], [ "Romaniello", "M.", "", "ESO" ], [ "Buonanno", "R.", "", "Univ. Rome" ], [ "Caputo", "F.", "", "OAR/INAF" ], [ "Castellani", "M.", "", "OAR/INAF" ], [ "Corsi", "C. E.", "", "OAR/INAF" ], [ "Ferraro", "I.", "", "OAR/INAF" ], [ "Iannicola", "G.", "", "OAR/INAF" ], [ "Pulone", "L.", "", "OAR/INAF" ] ]
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711.3535
Massimo Di Toro
M.Di Toro, M.Colonna, C.Rizzo, V.Baran
The Dynamical Dipole Radiation in Dissipative Collisions with Exotic Beams
10 pages, 6 figures, 14th Nuclear Physics Workshop, Kazimiers Dolny Sept. 07, Int.Jou.Modern Physics (2008) to appear
Int.J.Mod.Phys.E17:110-119,2008
10.1142/S0218301308009604
null
nucl-th
null
Heavy Ion Collisions (HIC) represent a unique tool to probe the in-medium nuclear interaction in regions away from saturation. In this work we present a selection of reaction observables in dissipative collisions particularly sensitive to the isovector part of the interaction, i.e. to the symmetry term of the nuclear Equation of State (EoS). At low energies the behavior of the symmetry energy around saturation influences dissipation and fragment production mechanisms. We will first discuss the recently observed Dynamical Dipole Radiation, due to a collective neutron-proton oscillation during the charge equilibration in fusion and deep-inelastic collisions. We will review in detail all the main properties, yield, spectrum, damping and angular distributions, revealing important isospin effects. Reactions induced by unstable 132Sn beams appear to be very promising tools to test the sub-saturation Isovector EoS. Predictions are also presented for deep-inelastic and fragmentation collisions induced by neutron rich projectiles. The importance of studying violent collisions with radioactive beams at low and Fermi energies is finally stressed.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 10:24:59 GMT" } ]
2008-11-26T00:00:00
[ [ "Di Toro", "M.", "" ], [ "Colonna", "M.", "" ], [ "Rizzo", "C.", "" ], [ "Baran", "V.", "" ] ]
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711.3536
Juan Nieves Dr.
Hiroshi Toki, Carmen Garcia-Recio, Juan Nieves
Photon induced Lambda(1520) production and the role of the K^* exchange
20 pages and 6 pages
Phys.Rev.D77:034001,2008
10.1103/PhysRevD.77.034001
null
hep-ph
null
We study the photon induced Lambda(1520) production in the effective Lagrangian method near threshold, E_\gamma^{LAB}<2 GeV, and in the quark-gluon string model at higher energies 3 GeV < E_\gamma^{LAB} < 5 GeV. In particular, we study the role of the K^* exchange for the production of Lambda(1520) within the SU(6) Weinberg-Tomozowa chiral unitary model proposed in Phys. Rev. D74 (2006) 034025. The coupling of the Lambda(1520) resonance to the N \bar K^* pair, which is dynamically generated, turns out to be relatively small and, thus, the K exchange mechanism dominates the reaction. In the higher energy region, where experimental data are available, the quark-gluon string mechanism with the K Regge trajectory reproduces both the energy and the angular distribution dependences of the Lambda(1520) photo-production reaction.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 10:34:09 GMT" } ]
2008-11-26T00:00:00
[ [ "Toki", "Hiroshi", "" ], [ "Garcia-Recio", "Carmen", "" ], [ "Nieves", "Juan", "" ] ]
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711.3537
Evelina Viada
Viada Evelina
The intersection of a curve with a union of translated codimension 2 subgroups in a power of an elliptic curve
50 pages
Algebra and Number Theory, Vol.2, No 3, 2008, 249-298
null
null
math.NT math.AG
null
Let C be an algebraic curve in a power of an elliptic curve, both defined over the algebraic numbers. We show that the set of algebraic points of C which satisfy certain conditions is a finite set. This result has implications with the Pink-Zilber Conjeture and the Mordel-Lang plus Bogomolov Theorem for curves.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 10:36:37 GMT" }, { "version": "v2", "created": "Mon, 7 Jan 2008 15:24:10 GMT" }, { "version": "v3", "created": "Sat, 2 Feb 2008 17:58:43 GMT" }, { "version": "v4", "created": "Tue, 3 Jun 2008 10:04:23 GMT" } ]
2008-11-10T00:00:00
[ [ "Evelina", "Viada", "" ] ]
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711.3538
Nakia Carlevaro
Nakia Carlevaro, Orchidea Maria Lecian, Giovanni Montani
Macroscopic and Microscopic Paradigms for the Torsion Field: from the Test-Particle Motion to a Lorentz Gauge Theory
15 pages, no figures, invited paper
Ann. Fond. L. de Broglie 32, 281-295 (2007)
null
null
gr-qc astro-ph hep-th
null
Torsion represents the most natural extension of General Relativity and it attracted interest over the years in view of its link with fundamental properties of particle motion. The bulk of the approaches concerning the torsion dynamics focus their attention on their geometrical nature and they are naturally led to formulate a non-propagating theory. Here we review two different paradigms to describe the role of the torsion field, as far as a propagating feature of the resulting dynamics is concerned. However, these two proposals deal with different pictures, i.e., a macroscopic approach, based on the construction of suitable potentials for the torsion field, and a microscopic approach, which relies on the identification of torsion with the gauge field associated with the local Lorentz symmetry. We analyze in some detail both points of view and their implications on the coupling between torsion and matter will be investigated. In particular, in the macroscopic case, we analyze the test-particle motion to fix the physical trajectory, while, in the microscopic approach, a natural coupling between torsion and the spin momentum of matter fields arises.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 10:37:48 GMT" }, { "version": "v2", "created": "Fri, 7 Dec 2007 12:11:30 GMT" } ]
2009-03-24T00:00:00
[ [ "Carlevaro", "Nakia", "" ], [ "Lecian", "Orchidea Maria", "" ], [ "Montani", "Giovanni", "" ] ]
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711.3539
Bilha Nissenson
Bilha Nissenson
Do Elementary Particles Have an Objective Existence?
5 pages
null
null
null
quant-ph
null
The formulation of quantum theory does not comply with the notion of objective existence of elementary particles. Objective existence independent of observation implies the distinguishability of elementary particles. In other words: If elementary particles have an objective existence independent of observations, then they are distinguishable. Or if elementary particles are indistinguishable then matter cannot have existence independent of our observation. This paper presents a simple deduction of the above statements, their compatibility with quantum theory, an example of quantum uniqueness situation and a suggested experiment. The conclusion is a short discussion about the redundancy of such phenomena.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 16:11:20 GMT" } ]
2007-11-26T00:00:00
[ [ "Nissenson", "Bilha", "" ] ]
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711.354
Richard de Grijs
Richard de Grijs (University of Sheffield, UK; NAOC Beijing, China)
Young massive star clusters: globular cluster progenitors?
8 pages, review talk given at the meeting on "Young massive star clusters - Initial conditions and environments", E. Perez, R. de Grijs, R. M. Gonzalez Delgado, eds., Granada (Spain), September 2007, Springer: Dordrecht
null
null
null
astro-ph
null
I review the long-term survival chances of young massive star clusters (YMCs), hallmarks of intense starburst episodes often associated with violent galaxy interactions. In particular, I address the key question as to whether at least some of these YMCs can be considered proto-globular clusters (GCs). In the absence of significant external perturbations, the key factor determining a cluster's long-term survival chances is the shape of its stellar initial mass function. I conclude that there is an increasing body of evidence that GC formation appears to be continuing until today; their long-term evolution crucially depends on their environmental conditions, however.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 10:49:04 GMT" } ]
2007-11-26T00:00:00
[ [ "de Grijs", "Richard", "", "University of Sheffield, UK; NAOC Beijing, China" ] ]
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711.3541
David Ridout
Pierre Mathieu and David Ridout
Logarithmic M(2,p) Minimal Models, their Logarithmic Couplings, and Duality
25 pages, 1 figure; v2 has several changes including more references and a new appendix; v3 has only minor changes (NPB published version)
Nucl.Phys.B801:268-295,2008
10.1016/j.nuclphysb.2008.02.017
null
hep-th
null
A natural construction of the logarithmic extension of the M(2,p) minimal models is presented, which generalises our previous model [0708.0802] of percolation (p=3). Its key aspect is the replacement of the minimal model irreducible modules by reducible ones obtained by requiring that only one of the two principal singular vectors of each module vanish. The resulting theory is then constructed systematically by repeatedly fusing these building block representations. This generates indecomposable representations of the type which signify the presence of logarithmic partner fields in the theory. The basic data characterising these indecomposable modules, the logarithmic couplings, are computed for many special cases and given a new structural interpretation. Quite remarkably, a number of them are presented in closed analytic form (for general p). These are the prime examples of ``gauge-invariant'' data - quantities independent of the ambiguities present in defining the logarithmic partner fields. Finally, mere global conformal invariance is shown to enforce strong constraints on the allowed spectrum: It is not possible to include modules other than those generated by the fusion of the model's building blocks. This generalises the statement that there cannot exist two effective central charges in a c=0 model. It also suggests the existence of a second ``dual'' logarithmic theory for each p. Such dual models are briefly discussed.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 13:09:44 GMT" }, { "version": "v2", "created": "Thu, 21 Feb 2008 15:55:14 GMT" }, { "version": "v3", "created": "Wed, 19 Mar 2008 09:03:29 GMT" } ]
2008-11-26T00:00:00
[ [ "Mathieu", "Pierre", "" ], [ "Ridout", "David", "" ] ]
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711.3542
Pablo D. Esquinazi
P. Esquinazi, N. Garc\'ia, J. Barzola-Quiquia, J.C. Gonz\'alez, M. Mu\~noz, P. R\"odiger, K. Schindler, J.-L. Yao, M. Ziese
Intrinsic Superconductivity at 25 K in Highly Oriented Pyrolytic Graphite
5 pages, 3 figures
null
10.1103/PhysRevB.78.134516
null
cond-mat.supr-con cond-mat.str-el
null
High resolution magnetoresistance data in highly oriented pyrolytic graphite thin samples manifest non-homogenous superconductivity with critical temperature $T_c \sim 25 $K. These data exhibit: i) hysteretic loops of resistance versus magnetic field similar to Josephson-coupled grains, ii) quantum Andreev's resonances and iii) absence of the Schubnikov-de Haas oscillations. The results indicate that graphite is a system with non-percolative superconducting domains immersed in a semiconducting-like matrix. As possible origin of the superconductivity in graphite we discuss interior-gap superconductivity when two very different electronic masses are present.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 10:55:09 GMT" } ]
2009-11-13T00:00:00
[ [ "Esquinazi", "P.", "" ], [ "García", "N.", "" ], [ "Barzola-Quiquia", "J.", "" ], [ "González", "J. C.", "" ], [ "Muñoz", "M.", "" ], [ "Rödiger", "P.", "" ], [ "Schindler", "K.", "" ], [ "Yao", "J. -L.", "" ], [ "Ziese", "M.", "" ] ]
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711.3543
Sergio Ciliberto
Pierre Jop (Phys-ENS), Sergio Ciliberto (Phys-ENS), Artem Petrosyan (Phys-ENS)
Work and dissipation fluctuations near the stochastic resonance of a colloidal particle
to be published in EPL
null
10.1209/0295-5075/81/50005
null
cond-mat.soft cond-mat.stat-mech
null
We study experimentally the fluctuations of the injected and dissipated energy in a system of a colloidal particle trapped in a double well potential periodically modulated by an external perturbation. The work done by the external force and the dissipated energy are measured close to the stochastic resonance where the injected power is maximum. We show that the steady state fluctuation theorem holds in this system.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 10:55:15 GMT" }, { "version": "v2", "created": "Wed, 13 Feb 2008 07:30:36 GMT" } ]
2009-11-13T00:00:00
[ [ "Jop", "Pierre", "", "Phys-ENS" ], [ "Ciliberto", "Sergio", "", "Phys-ENS" ], [ "Petrosyan", "Artem", "", "Phys-ENS" ] ]
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711.3544
Marcos Moshinsky
Marcos Moshinsky, Emerson Sadurni and Adolfo del Campo
Alternative Method for Determining the Feynman Propagator of a Non-Relativistic Quantum Mechanical Problem
This is a contribution to the Proc. of the Seventh International Conference ''Symmetry in Nonlinear Mathematical Physics'' (June 24-30, 2007, Kyiv, Ukraine), published in SIGMA (Symmetry, Integrability and Geometry: Methods and Applications) at http://www.emis.de/journals/SIGMA/ In v2 misprints are corrected
SIGMA 3 (2007), 110, 12 pages
10.3842/SIGMA.2007.110
null
quant-ph
null
A direct procedure for determining the propagator associated with a quantum mechanical problem was given by the Path Integration Procedure of Feynman. The Green function, which is the Fourier Transform with respect to the time variable of the propagator, can be derived later. In our approach, with the help of a Laplace transform, a direct way to get the energy dependent Green function is presented, and the propagator can be obtained later with an inverse Laplace transform. The method is illustrated through simple one dimensional examples and for time independent potentials, though it can be generalized to the derivation of more complicated propagators.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 11:08:44 GMT" }, { "version": "v2", "created": "Thu, 6 Dec 2007 21:18:50 GMT" } ]
2008-04-25T00:00:00
[ [ "Moshinsky", "Marcos", "" ], [ "Sadurni", "Emerson", "" ], [ "del Campo", "Adolfo", "" ] ]
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711.3545
Vasanthan Raghavan
Che Lin, Vasanthan Raghavan, Venu Veeravalli
To Code or Not to Code Across Time: Space-Time Coding with Feedback
22 pages, 4 figures, Submitted to IEEE JSAC, Nov. 2007
null
10.1109/JSAC.2008.081024
null
cs.IT math.IT
null
Space-time codes leverage the availability of multiple antennas to enhance the reliability of communication over wireless channels. While space-time codes have initially been designed with a focus on open-loop systems, recent technological advances have enabled the possibility of low-rate feedback from the receiver to the transmitter. The focus of this paper is on the implications of this feedback in a single-user multi-antenna system with a general model for spatial correlation. We assume a limited feedback model, that is, a coherent receiver and statistics along with B bits of quantized channel information at the transmitter. We study space-time coding with a family of linear dispersion (LD) codes that meet an additional orthogonality constraint so as to ensure low-complexity decoding. Our results show that, when the number of bits of feedback (B) is small, a space-time coding scheme that is equivalent to beamforming and does not code across time is optimal in a weak sense in that it maximizes the average received SNR. As B increases, this weak optimality transitions to optimality in a strong sense which is characterized by the maximization of the average mutual information. Thus, from a system designer's perspective, our work suggests that beamforming may not only be attractive from a low-complexity viewpoint, but also from an information-theoretic viewpoint.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 11:10:00 GMT" } ]
2016-11-17T00:00:00
[ [ "Lin", "Che", "" ], [ "Raghavan", "Vasanthan", "" ], [ "Veeravalli", "Venu", "" ] ]
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711.3546
Massimo Di Toro
M.Di Toro, M.Colonna, V.Greco, G.Ferini, C.Rizzo, J.Rizzo, V.Baran, T.Gaitanos, V.Prassa, H.H.Wolter, M.Zielinska-Pfabe
Constraining the Symmetry Energy: A Journey in the Isospin Physics from Coulomb Barrier to Deconfinement
15 pages, 5 figures, Int.Workshop on Nuclear Dynamics in Heavy Ion Reactions and Neutron Stars, Beijing Normal Univ. July 07, to appear in Int.Journ.Modern Physics E (2008)
Int.J.Mod.Phys.E17:1799-1814,2008
10.1142/S0218301308010799
null
nucl-th
null
Heavy Ion Collisions (HIC) represent a unique tool to probe the in-medium nuclear interaction in regions away from saturation. In this work we present a selection of reaction observables in dissipative collisions particularly sensitive to the isovector part of the interaction, i.e. to the symmetry term of the nuclear Equation of State (EoS). At low energies the behavior of the symmetry energy around saturation influences dissipation and fragment production mechanisms. We will first discuss the recently observed Dynamical Dipole Radiation, due to a collective neutron-proton oscillation during the charge equilibration in fusion and deep-inelastic collisions. Important Iso-EOS effects are stressed. Reactions induced by unstable 132Sn beams appear to be very promising tools to test the sub-saturation Isovector EoS. New Isospin sensitive observables are also presented for deep-inelastic, fragmentation collisions and Isospin equilibration measurements (Imbalance Ratios). The high density symmetry term can be derived from isospin effects on heavy ion reactions at relativistic energies (few AGeV range), that can even allow a ``direct'' study of the covariant structure of the isovector interaction in the hadron medium. Rather sensitive observables are proposed from collective flows and from pion/kaon production. The possibility of the transition to a mixed hadron-quark phase, at high baryon and isospin density, is finally suggested. Some signatures could come from an expected ``neutron trapping'' effect. The importance of studying violent collisions with radioactive beams from low to relativistic energies is finally stressed.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 11:13:39 GMT" } ]
2008-12-25T00:00:00
[ [ "Di Toro", "M.", "" ], [ "Colonna", "M.", "" ], [ "Greco", "V.", "" ], [ "Ferini", "G.", "" ], [ "Rizzo", "C.", "" ], [ "Rizzo", "J.", "" ], [ "Baran", "V.", "" ], [ "Gaitanos", "T.", "" ], [ "Prassa", "V.", "" ], [ "Wolter", "H. H.", "" ], [ "Zielinska-Pfabe", "M.", "" ] ]
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711.3547
Sergey Maleyev V.
S. V. Maleyev
Comment on "Theory of helimagnons in itinerant quantum systems" by D.Belitz, T.K.Kirpatrick and A.Rosch and "Cubic magnets with Dzyaloshinskii-Moriya interaction at low temperatures" by S.V.Maleyev
null
null
null
null
cond-mat.str-el
null
Comment on "Theory of helimagnons in itinerant quantum systems" by D.Belitz, T.K.Kirpatrick and A.Rosch and "Cubic magnets with Dzyaloshinskii-Moriya interaction at low temperatures" by S.V.Maleyev
[ { "version": "v1", "created": "Thu, 22 Nov 2007 11:30:25 GMT" } ]
2007-11-26T00:00:00
[ [ "Maleyev", "S. V.", "" ] ]
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711.3548
Atsushi Ito
Atsushi Ito and Hiroaki Nakamura
Molecular Dynamics Simulation of Plasma Surface Interaction
21 pages, 20078 US-Japan workshop, in TEXAS, U.S
null
null
null
cond-mat.mtrl-sci cond-mat.other
null
New interlayer intermolecular potential model was proposed and it represented ``ABAB'' staking of graphite. Hydrogen atom sputtering on graphite surface was investigated using molecular dynamics simulation. In the initial short time period, maintaining the flat structure of graphenes, hydrogen atoms brought about the difference interaction process in each incident energy. The first graphene often adsorbed 5 eV hydrogen atoms and reflected almost all of 15 eV hydrogen atoms. The hydrogen atoms which were injected at 30 eV penetrated into the inside of the graphite surface and were adsorbed between interlayer. The desorption of C2H2 on the clear graphite surface was observed in only the case incident at 5 eV. The animation of the MD simulation and radial distribution function indicated that the graphenes were peeled off one by one at regular interval. In common to the incident energy, the yielded molecules often had chain structures terminated by hydrogen atoms. The erosion yield increased compared with the case of no interlayer intermolecular force.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 15:42:33 GMT" } ]
2007-11-26T00:00:00
[ [ "Ito", "Atsushi", "" ], [ "Nakamura", "Hiroaki", "" ] ]
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711.3549
Vsevolod Katkov
V.L. Katkov and V.A. Osipov
Effect of band structure on field emission of crystalline graphite
15 pages, 12 figures. To be published in Journal of Physics: Condensed Matter
J. Phys.:Condens.Matter, vol. 20, p. 035204 (2008)
10.1088/0953-8984/20/03/035204
null
cond-mat.other
null
The field emission of crystalline AAA graphite is studied within a simple analytical approach with account of the exact dispersion relation near the Fermi level. The emission current is calculated for two crystal orientations with respect to the applied electric field. It is found that the exponent of the Fowler-Nordheim equation remains the same while the preexponential factor is markedly modified. For both field directions, the linear field dependence is found in weak fields and the standard quadratic Fowler-Nordheim behavior takes place in strong fields. A strong dependence of the emission current from the interlayer distance is observed. As an illustration of the method the known case of a single-walled carbon nanotube is considered.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 11:37:55 GMT" } ]
2009-11-13T00:00:00
[ [ "Katkov", "V. L.", "" ], [ "Osipov", "V. A.", "" ] ]
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711.355
Christoph Adam
C. Adam, N. Grandi, J. Sanchez-Guillen, A. Wereszczynski
K fields, compactons, and thick branes
some references and further remarks added
J.Phys.A41:212004,2008
10.1088/1751-8113/41/21/212004
null
hep-th gr-qc
null
K fields, that is, fields with a non-standard kinetic term, allow for soliton solutions with compact support, i.e., compactons. Compactons in 1+1 dimensions may give rise to topological defects of the domain wall type and with finite thickness in higher dimensions. Here we demonstrate that, for an appropriately chosen kinetic term, propagation of linear perturbations is completely suppressed outside the topological defect, confining the propagation of particles inside the domain wall. On the other hand, inside the topological defect the propagation of linear perturbations is of the standard type, in spite of the non-standard kinetic term. Consequently, this compacton domain wall may act like a brane of finite thickness which is embedded in a higher dimensional space, but to which matter fields are constrained. In addition, we find strong indications that, when gravity is taken into account, location of gravity in the sense of Randall--Sundrum works for these compacton domain walls. When seen from the bulk, these finite thickness branes, in fact, cannot be distinguished from infinitely thin branes.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 12:11:49 GMT" }, { "version": "v2", "created": "Wed, 2 Apr 2008 17:08:37 GMT" } ]
2008-11-26T00:00:00
[ [ "Adam", "C.", "" ], [ "Grandi", "N.", "" ], [ "Sanchez-Guillen", "J.", "" ], [ "Wereszczynski", "A.", "" ] ]
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711.3551
Sergej Flach
S. Flach, M. V. Ivanchenko, O. I. Kanakov and K. G. Mishagin
Periodic orbits, localization in normal mode space, and the Fermi-Pasta-Ulam problem
19 pages, 9 figures, to appear in Am. J. Phys
null
10.1119/1.2820396
null
nlin.PS
null
The Fermi-Pasta-Ulam problem was one of the first computational experiments. It has stirred the physics community since, and resisted a simple solution for half a century. The combination of straightforward simulations, efficient computational schemes for finding periodic orbits, and analytical estimates allows us to achieve significant progress. Recent results on $q$-breathers, which are time-periodic solutions that are localized in the space of normal modes of a lattice and maximize the energy at a certain mode number, are discussed, together with their relation to the Fermi-Pasta-Ulam problem. The localization properties of a $q$-breather are characterized by intensive parameters, that is, energy densities and wave numbers. By using scaling arguments, $q$-breather solutions are constructed in systems of arbitrarily large size. Frequency resonances in certain regions of wave number space lead to the complete delocalization of $q$-breathers. The relation of these features to the Fermi-Pasta-Ulam problem are discussed.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 12:00:30 GMT" } ]
2009-11-13T00:00:00
[ [ "Flach", "S.", "" ], [ "Ivanchenko", "M. V.", "" ], [ "Kanakov", "O. I.", "" ], [ "Mishagin", "K. G.", "" ] ]
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711.3552
Massimo Pica Ciamarra
Massimo Pica Ciamarra
Comment on ``Granular Entropy: Explicit Calculations for Planar Assemblies''
null
Phys. Rev. Lett. 99, 089401 (2007)
10.1103/PhysRevLett.99.089401
null
cond-mat.soft cond-mat.stat-mech
null
A Comment on the Letter by Raphael Blumenfeld and Sam F. Edwards, [Phys. Rev. Lett. 90, 114303 (2003)].
[ { "version": "v1", "created": "Thu, 22 Nov 2007 12:01:23 GMT" } ]
2007-11-26T00:00:00
[ [ "Ciamarra", "Massimo Pica", "" ] ]
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711.3553
Charles Torossian
Charles Torossian (IMJ)
Applications de la bi-quantification \`a la th\'eorie de Lie
Large English Introduction
null
null
null
math.QA math.RT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This article is a survey about applications of bi-quantization theory in Lie theory. We focus on a conjecture of M. Duflo. Most of the applications are coming from our article with Alberto Cattaneo and some extensions are relating discussions with my student. The end of the article is completely new. We prove that the conjecture E=1 implies the Kashiwara-Vergne conjecture. Our deformation is non geometric but uses a polynomial deformation of the coefficients.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 12:20:52 GMT" }, { "version": "v2", "created": "Fri, 30 Nov 2007 21:07:44 GMT" }, { "version": "v3", "created": "Thu, 17 Jul 2008 09:47:50 GMT" } ]
2008-07-17T00:00:00
[ [ "Torossian", "Charles", "", "IMJ" ] ]
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711.3554
Massimo Di Toro
M.Di Toro
Heavy Ion Dynamics and Neutron Stars
11 pages, no figures, Summary Talk, Int.Workshop on "Nuclear Dynamics in Heavy Ion Collisions and Neutron Stars", Beijing Normal Univ. July 07, to appear in Int.Journ.Modern Physics E (2008)
Int.J.Mod.Phys.E17:1989-1999,2008
10.1142/S0218301308010969
null
nucl-th
null
Some considerations are reported, freely inspired from the presentations and discussions during the Beijing Normal University Workshop on the above Subject, held in July 2007. Of course this cannot be a complete summary but just a collection of personal thougths aroused during the meeting.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 12:39:46 GMT" } ]
2008-12-25T00:00:00
[ [ "Di Toro", "M.", "" ] ]
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711.3555
Jian Hu
Jian Hu, Yu-Qing Lou
Collisional interaction limits between dark matters and baryons in `cooling flow' clusters
8 pages, 2 figures, MNRAS accepted
null
10.1111/j.1365-2966.2007.12755.x
null
astro-ph
null
Presuming weak collisional interactions to exchange the kinetic energy between dark matter and baryonic matter in a galaxy cluster, we re-examine the effectiveness of this process in several `cooling flow' galaxy clusters using available X-ray observations and infer an upper limit on the heavy dark matter particle (DMP)$-$proton cross section $\sigma_{\rm xp}$. With a relative collisional velocity $V-$dependent power-law form of $\sigma_{\rm xp}=\sigma_0(V/10^3 {\rm km s^{-1}})^a$ where $a\leq 0$, our inferred upper limit is $\sigma_0/m_{\rm x}\lsim 2\times10^{-25} {\rm cm}^2 {\rm GeV}^{-1}$ with $m_{\rm x}$ being the DMP mass. Based on a simple stability analysis of the thermal energy balance equation, we argue that the mechanism of DMP$-$baryon collisional interactions is unlikely to be a stable nongravitational heating source of intracluster medium (ICM) in inner core regions of `cooling flow' galaxy clusters.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 12:43:15 GMT" } ]
2009-11-13T00:00:00
[ [ "Hu", "Jian", "" ], [ "Lou", "Yu-Qing", "" ] ]
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711.3556
Manuel Perucho Pla
M. Perucho and V. Bosch-Ramon
Studying the interaction between microquasar jets and their environments
4 pages. Contribution to the proceedings of High Energy Phenomena in Relativistic Outflows, held in Dublin, Ireland, September 24-28, 2007
Int.J.Mod.Phys.D17:1939-1945,2008
10.1142/S0218271808013601
null
astro-ph
null
In high-mass microquasars (HMMQ), strong interactions between jets and stellar winds at binary system scales could occur. In order to explore this possibility, we have performed numerical 2-dimensional simulations of jets crossing the dense stellar material to study how the jet will be affected by these interactions. We find that the jet head generates strong shocks in the wind. These shocks reduce the jet advance speed, and compress and heat up jet and wind material. In addition, strong recollimation shocks can occur where pressure balance between the jet side and the surrounding medium is reached. All this, altogether with jet bending, could lead to the destruction of jets with power $<10^{36} \rm{erg/s}$. The conditions around the outflow shocks would be convenient for accelerating particles up to $\sim $TeV energies. These accelerated particles could emit via synchrotron and inverse Compton (IC) scattering if they were leptons, and via hadronic processes in case they were hadrons.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 12:51:21 GMT" } ]
2009-06-23T00:00:00
[ [ "Perucho", "M.", "" ], [ "Bosch-Ramon", "V.", "" ] ]
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711.3557
Roman Romanov
Roman Romanov
Notions of absolutely continuous subspace for nonselfadjoint operators
13 pages; a counterexample to the duality problem for spectral components has been added
null
null
null
math.FA math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We give an example of an operator with different weak and strong absolutely continuous subspaces, and a counterexample to the duality problem for the spectral components. Both examples are optimal in the scale of compact operators.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 12:54:11 GMT" }, { "version": "v2", "created": "Wed, 11 Jun 2008 05:44:18 GMT" } ]
2008-06-11T00:00:00
[ [ "Romanov", "Roman", "" ] ]
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711.3558
Hiroo Azuma
Hiroo Azuma
Dynamics of Bloch vector in thermal Jaynes-Cummings model
16 pages, 8 eps figures, latex2e; v2: a new section and references added
Phys. Rev. A 77, 063820 (2008)
10.1103/PhysRevA.77.063820
null
quant-ph
null
In this paper, we investigate the dynamics of the Bloch vector of a single two-level atom which interacts with a single quantized electromagnetic field mode according to the Jaynes-Cummings model, where the field is initially prepared in a thermal state. The time evolution of the Bloch vector S(t) seems to be in complete disorder because of the thermal distribution of the initial state of the field. Both the norm and the direction of S(t) oscillate hard and their periods seem infinite. We observe that the trajectory of the time evolution of S(t) in the two- or three-dimensional space does not form a closed path. To remove the fast frequency oscillation from the trajectory, we take the time-average of the Bloch vector S(t). We examine the histogram of {S_{z}(n\Delta t)|n=0,1,...,N} for small \Delta t and large N. It represents an absolute value of a derivative of the inverse function of S_{z}(t). (When the inverse function of y=S_{z}(t) is a multi-valued function, the histogram represents a summation of the absolute values of its derivatives at points whose real parts are equal to y on the Riemann surface.) We examine the dependence of the variance of the histogram on the temperature of the field. We estimate the lower bound of the entanglement between the atom and the field.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 00:56:53 GMT" }, { "version": "v2", "created": "Tue, 15 Apr 2008 21:00:38 GMT" } ]
2008-06-17T00:00:00
[ [ "Azuma", "Hiroo", "" ] ]
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711.3559
Cyril Proust
C. Jaudet, D. Vignolles, A. Audouard, J. Levallois, D. LeBoeuf, N. Doiron-Leyraud, B. Vignolle, M. Nardone, A. Zitouni, R. Liang, D.A. Bonn, W.N. Hardy, L. Taillefer, and C. Proust
de Haas-van Alphen oscillations in the underdoped cuprate YBa$_2$Cu$_3$O$_{6.5}$
published version
Phys. Rev. Lett. 100, 187005 (2008)
10.1103/PhysRevLett.100.187005
null
cond-mat.supr-con cond-mat.str-el
null
The de Haas-van Alphen effect was observed in the underdoped cuprate YBa$_2$Cu$_3$O$_{6.5}$ via a torque technique in pulsed magnetic fields up to 59 T. Above an irreversibility field of $\sim$30 T, the magnetization exhibits clear quantum oscillations with a single frequency of 540 T and a cyclotron mass of 1.76 times the free electron mass, in excellent agreement with previously observed Shubnikov-de Haas oscillations. The oscillations obey the standard Lifshitz-Kosevich formula of Fermi-liquid theory. This thermodynamic observation of quantum oscillations confirms the existence of a well-defined, close and coherent, Fermi surface in the pseudogap phase of cuprates.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 12:57:39 GMT" }, { "version": "v2", "created": "Tue, 13 May 2008 07:55:52 GMT" } ]
2009-11-13T00:00:00
[ [ "Jaudet", "C.", "" ], [ "Vignolles", "D.", "" ], [ "Audouard", "A.", "" ], [ "Levallois", "J.", "" ], [ "LeBoeuf", "D.", "" ], [ "Doiron-Leyraud", "N.", "" ], [ "Vignolle", "B.", "" ], [ "Nardone", "M.", "" ], [ "Zitouni", "A.", "" ], [ "Liang", "R.", "" ], [ "Bonn", "D. A.", "" ], [ "Hardy", "W. N.", "" ], [ "Taillefer", "L.", "" ], [ "Proust", "C.", "" ] ]
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711.356
Andrew Christianson
A.D. Christianson, M.D. Lumsden, M. Angst, Z. Yamani, W. Tian, R. Jin, E.A. Payzant, S.E. Nagler, B.C. Sales, and D. Mandrus
Three Dimensional Magnetic Correlations in Multiferroic LuFe2O4
4 figures
Phys. Rev. Lett. 100, 107601 (2008)
10.1103/PhysRevLett.100.107601
null
cond-mat.str-el
null
We present single-crystal neutron diffraction measurements on multiferroic LuFe2O4 showing phase transitions at 240 and 175 K. Magnetic reflections are observed below each transition indicating that the magnetic interactions in LuFe2O4 are 3-dimensional (3D) in character. The magnetic structure is refined as a ferrimagnetic spin configuration below the 240 K transition. While 3D magnetic correlations persists below 175 K, a significant broadening of the magnetic peaks is observed along with the build up of a diffuse component to the magnetic scattering.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 13:00:27 GMT" }, { "version": "v2", "created": "Mon, 17 Mar 2008 21:41:45 GMT" }, { "version": "v3", "created": "Wed, 19 Mar 2008 02:12:25 GMT" }, { "version": "v4", "created": "Wed, 19 Mar 2008 21:25:54 GMT" } ]
2009-11-13T00:00:00
[ [ "Christianson", "A. D.", "" ], [ "Lumsden", "M. D.", "" ], [ "Angst", "M.", "" ], [ "Yamani", "Z.", "" ], [ "Tian", "W.", "" ], [ "Jin", "R.", "" ], [ "Payzant", "E. A.", "" ], [ "Nagler", "S. E.", "" ], [ "Sales", "B. C.", "" ], [ "Mandrus", "D.", "" ] ]
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711.3561
Andre Sopczak
Andre Sopczak (Lancaster University, UK; on behalf of the LCFI Collaboration)
Radiation Hardness Studies in a CCD with High-Speed Column Parallel Readout
3 pages, 6 figures; presented at IEEE'07, ALCPG'07, ICATPP'07
JINST3:P05007,2008
10.1088/1748-0221/3/05/P05007
null
physics.ins-det
null
Charge Coupled Devices (CCDs) have been successfully used in several high energy physics experiments over the past two decades. Their high spatial resolution and thin sensitive layers make them an excellent tool for studying short-lived particles. The Linear Collider Flavour Identification (LCFI) collaboration is developing Column-Parallel CCDs (CPCCDs) for the vertex detector of the International Linear Collider (ILC). The CPCCDs can be read out many times faster than standard CCDs, significantly increasing their operating speed. The results of detailed simulations of the charge transfer inefficiency (CTI) of a prototype CPCCD are reported and studies of the influence of gate voltage on the CTI described. The effects of bulk radiation damage on the CTI of a CPCCD are studied by simulating the effects of two electron trap levels, 0.17 and 0.44 eV, at different concentrations and operating temperatures. The dependence of the CTI on different occupancy levels (percentage of hit pixels) and readout frequencies is also studied. The optimal operating temperature for the CPCCD, where the effects of the charge trapping are at a minimum, is found to be about 230 K for the range of readout speeds proposed for the ILC. The results of the full simulation have been compared with a simple analytic model.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 15:03:10 GMT" } ]
2008-11-26T00:00:00
[ [ "Sopczak", "Andre", "", "Lancaster University, UK; on behalf of the LCFI\n Collaboration" ] ]
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711.3562
Franck Laloe
Franck Lalo\"e (LKB - Lhomond), William J. Mullin (UMASS)
EPR argument and Bell inequalities for Bose-Einstein spin condensates
a few misprints corrected, a reference added. This is the published version
Physical Review A: Atomic, Molecular and Optical Physics 77 (2008) 022108
10.1103/PhysRevA.77.022108
null
quant-ph cond-mat.other
null
We discuss the properties of two Bose-Einstein condensates in different spin states, represented quantum mechanically by a double Fock state. Individual measurements of the spins of the particles are performed in transverse directions (perpendicular to the spin quantization axis), giving access to the relative phase of the two macroscopically occupied states. Before the first spin measurement, the phase is completely undetermined; after a few measurements, a more and more precise knowledge of its value emerges under the effect of the quantum measurement process. This naturally leads to the usual notion of a quasi-classical phase (Anderson phase) and to an interesting transposition of the EPR (Einstein-Podolsky-Rosen) argument to macroscopic physical quantities. The purpose of this article is to discuss this transposition, as well as situations where the notion of a quasi-classical phase is no longer sufficient to account for the quantum results, and where significant violations of Bell type inequalities are predicted.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 13:17:34 GMT" }, { "version": "v2", "created": "Mon, 18 Feb 2008 07:29:18 GMT" } ]
2008-02-18T00:00:00
[ [ "Laloë", "Franck", "", "LKB - Lhomond" ], [ "Mullin", "William J.", "", "UMASS" ] ]
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711.3563
Bernardo Nunes Borges de Lima
J. van den Berg, B.N.B. de Lima
Linear Lower Bounds for $\delta_c(p)$ for a Class of 2D Self-Destructive Percolation Models
null
null
null
null
math.PR math-ph math.MP
null
The self-destructive percolation model is defined as follows: Consider percolation with parameter $p > p_c$. Remove the infinite occupied cluster. Finally, give each vertex (or, for bond percolation, each edge) that at this stage is vacant, an extra chance $\delta$ to become occupied. Let $\delta_c(p)$ be the minimal value of $\delta$, needed to obtain an infinite occupied cluster in the final configuration. This model was introduced some years ago by van den Berg and Brouwer. They showed that, for the site model on the square lattice (and a few other 2D lattices satisfying a special technical condition) that $\delta_c(p)\geq\frac{(p-p_c)}{p}$. In particular, $\delta_c(p)$ is at least linear in $p-p_c$. Although the arguments used by van den Berg and Brouwer look quite rigid, we show that they can be suitably modified to obtain similar linear lower bounds for $\delta_c(p)$ (with $p$ near $p_c$) for a much larger class of 2D lattices, including bond percolation on the square and triangular lattices, and site percolation on the star lattice (or matching lattice) of the square lattice.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 13:17:50 GMT" } ]
2007-11-26T00:00:00
[ [ "Berg", "J. van den", "" ], [ "de Lima", "B. N. B.", "" ] ]
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711.3564
Andrei Sokolov
A.Sokolov and T.Cawthorne
Phase-referencing on BL Lac
5 pages, 7 figures
null
null
null
astro-ph
null
We report the results of a phase-referencing study aimed at uncovering precession of the VLBI jet of BL Lac. The observations were conducted at 8, 15, 22, and 43 GHz and consist of seven epochs spanning about two years. We investigated the change in the absolute position of BL Lac's radio core by means of phase-referencing with two nearby sources, 2151+431 and 2207+374. The shift in the position of the core perpendicular to the jet is a signature of precession. However, the periodic variations with an amplitude of ~0.15 mas and a period of 1 year can be attributed to seasonal weather variations. We also detect a trend in position of the core on the scale of ~0.1 mas over two years.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 13:21:15 GMT" } ]
2007-11-26T00:00:00
[ [ "Sokolov", "A.", "" ], [ "Cawthorne", "T.", "" ] ]
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711.3565
David Nutter
D. Nutter, J. M. Kirk, D. Stamatellos and D. Ward-Thompson
SCUBA and Spitzer observations of the Taurus molecular cloud - pulling the bull's tail
10 pages, 9 Figures, Accepted by MNRAS
null
10.1111/j.1365-2966.2007.12750.x
null
astro-ph
null
We present continuum data from the Submillimetre Common-User Bolometer Array (SCUBA) on the James Clerk Maxwell Telescope (JCMT), and the Mid-Infrared Photometer for Spitzer (MIPS) on the Spitzer Space Telescope, at submillimetre and infrared wavelengths respectively. We study the Taurus molecular cloud 1 (TMC1), and in particular the region of the Taurus Molecular Ring (TMR). In the continuum data we see no real evidence for a ring, but rather we see one side of it only, appearing as a filament. We name the filament `the bull's tail'. The filament is seen in emission at 850, 450 and 160um, and in absorption at 70um. We compare the data with archive data from the Infra-Red Astronomical Satellite (IRAS) at 12, 25, 60, 100um, in which the filament is also seen in absorption. We find that the emission from the filament consists of two components: a narrow, cold (~8K), central core; and a broader, slightly warmer (~12K), shoulder of emission. We use a radiative transfer code to model the filament's appearance, either in emission or absorption, simultaneously at each of the different wavelengths. Our best fit model uses a Plummer-like density profile and a homogeneous interstellar dust grain population. Unlike previous work on a similar, but different filament in Taurus, we require no grain coagulation to explain our data.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 13:24:30 GMT" } ]
2009-11-13T00:00:00
[ [ "Nutter", "D.", "" ], [ "Kirk", "J. M.", "" ], [ "Stamatellos", "D.", "" ], [ "Ward-Thompson", "D.", "" ] ]
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711.3566
Piotr Stefanski
Piotr Stefanski
Proposal for a correlation induced spin-current polarizer
5 pages, 4 figures, title changed, rearranged figures, one reference added, discussion extension, accepted for Phys. Rev. B
Phys. Rev. B 77, 125331 (2008)
10.1103/PhysRevB.77.125331
null
cond-mat.mes-hall
null
We propose a spin polarizer device composed of a quantum dot connected to the spin polarized leads. The spin control of the current flowing through the device is entirely due to the Coulomb interactions present inside the dot. We show that the initial polarization present in the source lead can be reverted or suppressed just by manipulating the gate voltage acting on the dot, the presence of the external magnetic field is not required. The influence of the temperature and finite bias on the efficiency of the current spin switching effect is also discussed.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 13:28:34 GMT" }, { "version": "v2", "created": "Wed, 5 Mar 2008 09:20:16 GMT" } ]
2009-11-13T00:00:00
[ [ "Stefanski", "Piotr", "" ] ]
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711.3567
Sebastian Loth
S. Loth, M. Wenderoth, R. G. Ulbrich
Influence of surface-related strain and electric field on acceptor wave functions in Zincblende semiconductors
8 pages, 4 figures
null
10.1103/PhysRevB.77.115344
null
cond-mat.mes-hall cond-mat.dis-nn
null
The spatial distribution of the local density of states (LDOS) at Mn acceptors near the (110) surface of p-doped InAs is investigated by Scanning Tunneling Microscopy (STM). The shapes of the acceptor contrasts for different dopant depths under the surface are analyzed. Acceptors located within the first ten subsurface layers of the semiconductor show a lower symmetry than expected from theoretical predictions of the bulk acceptor wave function. They exhibit a (001) mirror asymmetry. The degree of asymmetry depends on the acceptor atoms' depths. The measured contrasts for acceptors buried below the 10th subsurface layer closely match the theoretically derived shape. Two effects are able to explain the symmetry reduction: the strain field of the surface relaxation and the tip-induced electric field.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 13:28:47 GMT" } ]
2013-05-29T00:00:00
[ [ "Loth", "S.", "" ], [ "Wenderoth", "M.", "" ], [ "Ulbrich", "R. G.", "" ] ]
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711.3568
Ezio Vasselli
Ezio Vasselli
Bundles of C*-algebras and the KK(X;-,-)-bifunctor
16 pages; uses xy.sty
Proc. Conf. C*-algebras and elliptic theory, Trends in Mathematics (2006) 313-327
null
null
math.KT math.OA
null
An overview about C*-algebra bundles with a Z-grading is presented, with particular emphasis on classification questions. In particular, we discuss the role of the representable KK(X ; -, -)-bifunctor introduced by Kasparov. As an application, we consider Cuntz-Pimsner algebras associated with vector bundles, and give a classification in terms of K-theoretical invariants in the case in which the base space is an n-sphere.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 13:30:52 GMT" } ]
2011-11-21T00:00:00
[ [ "Vasselli", "Ezio", "" ] ]
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711.3569
Cosimo Bambi
C. Bambi, A. Drago
Constraints on temporal variation of fundamental constants from GRBs
5 pages, no figure. v3: refereed version
Astropart.Phys.29:223-227,2008
10.1016/j.astropartphys.2008.02.001
WSU-HEP-0710
hep-ph astro-ph
null
The formation of a strange or hybrid star from a neutron star progenitor is believed to occur when the central stellar density exceeds a critical value. If the transition from hadron to quark matter is of first order, the event has to release a huge amount of energy in a very short time and we would be able to observe the phenomenon even if it is at cosmological distance far from us; most likely, such violent quark deconfinement would be associated with at least a fraction of the observed gamma ray bursts. If we allow for temporal variations of fundamental constants like $\Lambda_{QCD}$ or $G_N$, we can expect that neutron stars with an initial central density just below the critical value can enter into the region where strange or hybrid stars are the true ground state. From the observed rate of long gamma ray bursts, we are able to deduce the constraint $\dot{G}_N/G_N \lesssim 10^{-17} {\rm yr^{-1}}$, which is about 5 orders of magnitude more stringent than the strongest previous bounds on a possible increasing $G_N$.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 13:32:43 GMT" }, { "version": "v2", "created": "Thu, 29 Nov 2007 23:44:53 GMT" }, { "version": "v3", "created": "Tue, 5 Feb 2008 13:34:08 GMT" } ]
2008-11-26T00:00:00
[ [ "Bambi", "C.", "" ], [ "Drago", "A.", "" ] ]
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711.357
Mark Perel'man
Mark E. Perel'man, Vitali A. Tatartchenko
Phase Transitions of the First Kind as Radiation Processes
17 pages
null
10.1016/j.physleta.2007.11.056
null
physics.optics physics.gen-ph
null
Crystallization and vapor condensation are considered as processes of sequential entering of single atoms/molecules into condensate. The latent heat can be carry away by radiation of characteristic frequencies generated in the course of transition. The estimated dependences of latent (radiated) energy of boiling on temperature confirm and prove the well-known empirical Trouton's rule applicable to many simple substances. It leads to the estimation of interrelation of critical parameters of corresponding substances. Experimental results of the authors and other researchers concerning crystallization from the melt of different substances (alkali halides, sapphire, tellurium, ice, copper) are presented, as well as condensation of water vapor, the correspondence to the offered model is established. It allows developing of the spectroscopy of phase transitions, and can lead to control of crystallization process, to crystallization stimulated by the characteristic radiation, etc. Formation of clouds in our atmosphere should be accompanied by characteristic radiation detectable for meteorological warnings.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 13:34:53 GMT" }, { "version": "v2", "created": "Sat, 19 Jan 2008 12:58:33 GMT" } ]
2009-11-13T00:00:00
[ [ "Perel'man", "Mark E.", "" ], [ "Tatartchenko", "Vitali A.", "" ] ]
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711.3571
Daniel Lacour
M. Hehn (LPM), Daniel Lacour (LPM), F. Montaigne (LPM), J. Briones (LPM), R. Belkhou (SSOLEIL), S. El Moussaoui (SSOLEIL), F. Maccherozzi (SSOLEIL), N. Rougemaille (NEEL)
360 degree domain wall generation in the soft layer of magnetic tunnel junctions
null
Applied Physics Letters 92 (2008) 072501
10.1063/1.2838455
null
cond-mat.mtrl-sci
null
High spatial resolution X-ray photo-emission electron microscopy technique has been used to study the influence of the dipolar coupling taking place between the NiFe and the Co ferromagnetic electrodes of micron sized, elliptical shaped magnetic tunnel junctions. The chemical selectivity of this technique allows to observe independently the magnetic domain structure in each ferromagnetic electrode. The combination of this powerful imaging technique with micromagnetic simulations allows to evidence that a 360 degree domain wall can be stabilized in the NiFe soft layer. In this letter, we discuss the origin and the formation conditions of those 360 degree domain walls evidenced experimentally and numerically.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 13:40:15 GMT" } ]
2008-04-02T00:00:00
[ [ "Hehn", "M.", "", "LPM" ], [ "Lacour", "Daniel", "", "LPM" ], [ "Montaigne", "F.", "", "LPM" ], [ "Briones", "J.", "", "LPM" ], [ "Belkhou", "R.", "", "SSOLEIL" ], [ "Moussaoui", "S. El", "", "SSOLEIL" ], [ "Maccherozzi", "F.", "", "SSOLEIL" ], [ "Rougemaille", "N.", "", "NEEL" ] ]
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711.3572
Tam\'as K\'alm\'an
Tam\'as K\'alm\'an
Rulings of Legendrian knots as spanning surfaces
9 pages
null
null
null
math.GT math.SG
null
Each ruling of a Legendrian link can be naturally treated as a surface. For knots, the ruling is 2-graded if and only if the surface is orientable. For 2-graded rulings of homogeneous (in particular, alternating) knots, we prove that the genus of this surface is at most the genus of the knot. While this is not true in general, we do prove that the canonical genus (a.k.a. diagram genus) of any knot is an upper bound for the genera of its 2-graded rulings.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 13:41:01 GMT" } ]
2007-11-26T00:00:00
[ [ "Kálmán", "Tamás", "" ] ]
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711.3573
Alejandra Kandus
Alejandra Kandus (UESC-Brazil) and Christos G. Tsagas (AUTH-Greece)
Generalized Ohm's law for relativistic plasmas
12 pages, revtex style, no figures, minor changes, accepted for publication in MNRAS
Mon.Not.Roy.Astron.Soc. 385 (2008) 883
10.1111/j.1365-2966.2008.12862.x
null
astro-ph gr-qc
null
We generalise the relativistic expression of Ohm's law by studying a multi-fluid system of charged species using the 1+3 covariant formulation of general relativistic electrodynamics. This is done by providing a fully relativistic, fully nonlinear propagation equation for the spatial component of the electric 4-current. Our analysis proceeds along the lines of the non-relativistic studies and extends previous relativistic work on cold plasmas. Exploiting the compactness and transparency of the covariant formalism, we provide a direct comparison with the standard Newtonian versions of Ohm's law and identify the relativistic corrections in an unambiguous way. The generalised expression of Ohm's law is initially given relative to an arbitrary observer and for a multi-component relativistic charged medium. Then, the law is written with respect to the Eckart frame and for a hot two-fluid plasma with zero total charge. Finally, we apply our analysis to a cold proton-electron plasma and recover the well known magnetohydrodynamic expressions. In every step, we discuss the approximations made and identify familiar effects, like the Biermann-battery and the Hall effect.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 13:45:00 GMT" }, { "version": "v2", "created": "Mon, 17 Dec 2007 13:05:44 GMT" } ]
2009-11-13T00:00:00
[ [ "Kandus", "Alejandra", "", "UESC-Brazil" ], [ "Tsagas", "Christos G.", "", "AUTH-Greece" ] ]
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711.3574
Nelson Vieira
P. Cerejeiras and N. Vieira
Fundamental Solutions of the Instationary Schrodinger Difference Operator
Submited to publication in Advances in Applied Clifford Algebras (special issue for WCAA 07)
null
null
null
math-ph math.CV math.MP
null
In this paper we will study the existence of fundamental solutions for the explicit and implicit backward time dependent Schodinger equation, via discrete Fourier transform and its symbol for the Laplace operator. In both cases we will prove that the discrete fundamental solutions obtained converges to the continuous fundamental solution in the $l_1-$norm sense.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 15:22:13 GMT" } ]
2007-11-26T00:00:00
[ [ "Cerejeiras", "P.", "" ], [ "Vieira", "N.", "" ] ]
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711.3575
Kenta Kiuchi
Kenta Kiuchi and Hisa-aki Shinkai
Numerical experiments of adjusted BSSN systems for controlling constraint violations
to be published in PRD
Phys.Rev.D77:044010,2008
10.1103/PhysRevD.77.044010
null
gr-qc astro-ph
null
We present our numerical comparisons between the BSSN formulation widely used in numerical relativity today and its adjusted versions using constraints. We performed three testbeds: gauge-wave, linear wave, and Gowdy-wave tests, proposed by the Mexico workshop on the formulation problem of the Einstein equations. We tried three kinds of adjustments, which were previously proposed from the analysis of the constraint propagation equations, and investigated how they improve the accuracy and stability of evolutions. We observed that the signature of the proposed Lagrange multipliers are always right and the adjustments improve the convergence and stability of the simulations. When the original BSSN system already shows satisfactory good evolutions (e.g., linear wave test), the adjusted versions also coincide with those evolutions; while in some cases (e.g., gauge-wave or Gowdy-wave tests) the simulations using the adjusted systems last 10 times as long as those using the original BSSN equations. Our demonstrations imply a potential to construct a robust evolution system against constraint violations even in highly dynamical situations.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 14:01:24 GMT" }, { "version": "v2", "created": "Mon, 7 Jan 2008 11:01:02 GMT" } ]
2008-11-26T00:00:00
[ [ "Kiuchi", "Kenta", "" ], [ "Shinkai", "Hisa-aki", "" ] ]
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711.3576
Bakmaev Sabir
E. A. Kuraev, V. V. Bytev, S. Bakmaev, E.N. Antonov
Testing the RRPP vertex of effective Regge action
9 pages
Phys.Lett.B664:274-278,2008
10.1016/j.physletb.2008.05.042
null
hep-ph
null
In frames of effective Regge action the vertices describing conversion of two reggeized gluons to one two and three ordinary gluons was constructed. The self-consistency: Bose symmetry and gauge invariance properties checks was shown to be fulfilled. The simplest one with creation of a single gluon was intensively verified in programs of experimental and theoretical treatment since it determine the kernel of of the known BFKL equation. Here we discuss the possibility to check the vertex with creation of two real gluons, which can reveal itself in process of scalar mesons production in high energy peripheral nucleons collisions. We show that the mechanisms which include emission of two gluons in the same effective vertex contribution dominate compared with one with the creation of two separate gluons. Numerical estimations of cross section of pair of charged pions production for LHC facility give the value or order $10 mb$. As well we estimate the excess of production of positively charged muons (as a decay of pions) created by cosmic ray proton collisions with the atmosphere gas nuclei to be in a reasonable agreement with modern data.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 15:18:29 GMT" } ]
2008-11-26T00:00:00
[ [ "Kuraev", "E. A.", "" ], [ "Bytev", "V. V.", "" ], [ "Bakmaev", "S.", "" ], [ "Antonov", "E. N.", "" ] ]
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711.3577
T. Merkouris
T. Merkouris
Transform martingale estimating functions
Published in at http://dx.doi.org/10.1214/009053607000000299 the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Annals of Statistics 2007, Vol. 35, No. 5, 1975-2000
10.1214/009053607000000299
IMS-AOS-AOS0258
math.ST stat.TH
null
An estimation method is proposed for a wide variety of discrete time stochastic processes that have an intractable likelihood function but are otherwise conveniently specified by an integral transform such as the characteristic function, the Laplace transform or the probability generating function. This method involves the construction of classes of transform-based martingale estimating functions that fit into the general framework of quasi-likelihood. In the parametric setting of a discrete time stochastic process, we obtain transform quasi-score functions by projecting the unavailable score function onto the special linear spaces formed by these classes. The specification of the process by any of the main integral transforms makes possible an arbitrarily close approximation of the score function in an infinite-dimensional Hilbert space by optimally combining transform martingale quasi-score functions. It also allows an extension of the domain of application of quasi-likelihood methodology to processes with infinite conditional second moment.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 14:03:14 GMT" } ]
2009-09-29T00:00:00
[ [ "Merkouris", "T.", "" ] ]
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711.3578
Seyed Majid Saberi Fathi
Maurice Courbage (MSC), Seyed Majid Saberi Fathi (MSC)
A formula for the spectral projection of the time operator
This paper will be published in the proceeding of XXV Workshop on Geometric Methods in Physics in the Journal of Geometry and Symmetry in Physics
null
null
null
quant-ph
null
In this paper, we study the one-level Friedrichs model with using the quantum time super-operator that predicts the excited state decay inside the continuum. Its survival probability in long time limit is an algebraically decreasing function and an exponentially decreasing multiplied by the oscillating functions.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 14:04:11 GMT" } ]
2007-11-26T00:00:00
[ [ "Courbage", "Maurice", "", "MSC" ], [ "Fathi", "Seyed Majid Saberi", "", "MSC" ] ]
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711.3579
- Departement Mathematiques Orsay
Valentin Poenaru (LM-Orsay)
Discrete symmetry with compact fundamental domain, and geometric simple connectivity - A provisional Outline of work in Progress -
null
null
null
null
math.GT
null
We show that a certain geometric property, the QSF introduced by S. Brick and M. Mihalik, is universally true for {\ibf all} finitely presented groups $\Gamma$. One way of defining this property is the existence of a smooth compact manifold $M$ with $\pi_1 M = \Gamma$, such that $\tilde M$ is geometrically simply-connected ({\it i.e.} without handles of index $\lambda = 1$). There are also alternative, more group-theoretical definitions, which are presentation independent. But $\Gamma \in {\rm QSF}$ is not only a universal property, it is quite highly non-trivial too; its very special case for $\Gamma = \pi_1 M^3$ (where it means $\pi_1^{\infty} \tilde M^3 = 0$) is actually already known, as a corollary of G. Perelman's big breakthrough on the Geometrization of 3-Manifolds.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 14:05:11 GMT" } ]
2007-11-26T00:00:00
[ [ "Poenaru", "Valentin", "", "LM-Orsay" ] ]
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711.358
Giovanni Feverati
Giovanni Feverati, Fabio Musso
An evolutionary model with Turing machines
16 pages, 7 figures
null
10.1103/PhysRevE.77.061901
LAPTH-1217/07
q-bio.QM cs.NE q-bio.GN
null
The development of a large non-coding fraction in eukaryotic DNA and the phenomenon of the code-bloat in the field of evolutionary computations show a striking similarity. This seems to suggest that (in the presence of mechanisms of code growth) the evolution of a complex code can't be attained without maintaining a large inactive fraction. To test this hypothesis we performed computer simulations of an evolutionary toy model for Turing machines, studying the relations among fitness and coding/non-coding ratio while varying mutation and code growth rates. The results suggest that, in our model, having a large reservoir of non-coding states constitutes a great (long term) evolutionary advantage.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 14:47:06 GMT" } ]
2009-11-13T00:00:00
[ [ "Feverati", "Giovanni", "" ], [ "Musso", "Fabio", "" ] ]
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711.3581
Josep Perello
Carl Chiarella, Giulia Iori, Josep Perello
The Impact of Heterogeneous Trading Rules on the Limit Order Book and Order Flows
15 pages, 11 figures
Journal of Economic Dynamics and Control 33, 525 (2009)
10.1016/j.jedc.2008.08.001
null
q-fin.TR physics.soc-ph
null
In this paper we develop a model of an order-driven market where traders set bids and asks and post market or limit orders according to exogenously fixed rules. Agents are assumed to have three components to the expectation of future asset returns, namely-fundamentalist, chartist and noise trader. Furthermore agents differ in the characteristics describing these components, such as time horizon, risk aversion and the weights given to the various components. The model developed here extends a great deal of earlier literature in that the order submissions of agents are determined by utility maximisation, rather than the mechanical unit order size that is commonly assumed. In this way the order flow is better related to the ongoing evolution of the market. For the given market structure we analyze the impact of the three components of the trading strategies on the statistical properties of prices and order flows and observe that it is the chartist strategy that is mainly responsible of the fat tails and clustering in the artificial price data generated by the model. The paper provides further evidence that large price changes are likely to be generated by the presence of large gaps in the book.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 14:10:06 GMT" } ]
2009-02-16T00:00:00
[ [ "Chiarella", "Carl", "" ], [ "Iori", "Giulia", "" ], [ "Perello", "Josep", "" ] ]
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711.3582
Faycal Ben Adda
Faycal Ben Adda
Mathematical model for fractal manifold
30 page, A new mathematical object that describe a variable geometry
Int.J.PureAppl.Math.38:159-190,2007
null
null
physics.gen-ph
null
We have built a new kind of manifolds which leads to an alternative new geometrical space. The study of the nowhere differentiable functions via a family of mean functions leads to a new characterization of this category of functions. A fluctuant manifold has been built with an appearance of a new structure on it at every scale, and we embedded into it an internal structure to transform its fluctuant geometry to a new fixed geometry. This approach leads us to what we call fractal manifold. The elements of this kind of manifold appear locally as tiny double strings, with an appearance of new structure at every step of approximation. We have obtained a variable dimensional space which is locally neither a continuum nor a discrete, but a mixture of both. Space acquires a variable geometry, it becomes explicitly dependent on the approximation process, and the geometry on it assumed to be characterized not only by curvature, but also by the appearance of new structure at every step of approximation.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 14:11:45 GMT" } ]
2008-11-26T00:00:00
[ [ "Adda", "Faycal Ben", "" ] ]
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711.3583
Jean-Marc Bouclet
Jean-Marc Bouclet
Semi-classical calculus on manifolds with ends and weighted Lp estimates
33 pages
null
null
null
math.AP math.SP
null
For a class of non compact Riemannian manifolds with ends, we give pseudo-differential expansions of bounded functions of the semi-classical Laplacian and study related Lp boundedness properties.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 14:13:26 GMT" } ]
2007-11-26T00:00:00
[ [ "Bouclet", "Jean-Marc", "" ] ]
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711.3584
Fab\'iola Ribeiro
Fabiola M. A. Ribeiro, Marcos P. Diaz
Tomographic Simulations of Accretion Disks in Cataclysmic Variables - Flickering and Wind
9 pages, 9 figures
Publ. Astron. Soc. Japan 60, pp.327-335 (2008)
10.1093/pasj/60.2.327
null
astro-ph
null
Both continuum and emission line flickering are phenomena directly associated with the mass accretion process. In this work we simulate accretion disk Doppler maps including the effects of winds and flickering flares. Synthetic flickering Doppler maps are calculated and the effect of the flickering parameters on the maps is explored. Jets and winds occur in many astrophysical objects where accretion disks are present. Jets are generally absent among the cataclysmic variables (CVs), but there is evidence of mass loss by wind in many objects. CVs are ideal objects to study accretion disks and consequently to study the wind associated with these disks. We also present simulations of accretion disks including the presence of a wind with orbital phase resolution. Synthetic H-alpha line profiles in the optical region are obtained and their corresponding Doppler maps are calculated. The effect of the wind simulation parameters on the wind line profiles is also explored. From this study we verified that optically thick lines and/or emission by diffuse material into the primary Roche lobe are necessary to generate single peaked line profiles, often seen in CVs. The future accounting of these effects is suggested for interpreting Doppler tomography reconstructions.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 14:17:29 GMT" } ]
2015-05-13T00:00:00
[ [ "Ribeiro", "Fabiola M. A.", "" ], [ "Diaz", "Marcos P.", "" ] ]
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711.3585
Jean-Marc Bouclet
Jean-Marc Bouclet
Littlewood-Paley decompositions on manifolds with ends
25 pages
null
null
null
math.AP math.CA
null
For certain non compact Riemannian manifolds with ends, we obtain Littlewood-Paley type estimates on (weighted) Lp spaces, using the usual square function defined by a dyadic partition.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 14:20:08 GMT" } ]
2007-11-26T00:00:00
[ [ "Bouclet", "Jean-Marc", "" ] ]
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711.3586
Jonathan Plumridge Dr
Jonathan Plumridge
Mid-Infrared waveguides and negative refraction with anisotropic metamaterials
null
null
null
null
cond-mat.mtrl-sci cond-mat.other
null
We propose two metamaterial waveguides, operating in the mid-IR, which would display negative refraction. The first waveguide is a metallic strip incorporating quantum wells, whereas the second is a dielectric waveguide which incorporates quantum wells. The negative refraction of both waveguides occurs around the intersubband transition (ISBT) of the quantum wells and is dependent upon the 2D concentration of electron within the wells; these materials could be grown by conventional semiconductor technology (MBE) and the electron concentration within the wells controlled externally by electric fields or optically pumping.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 14:23:37 GMT" } ]
2007-11-26T00:00:00
[ [ "Plumridge", "Jonathan", "" ] ]
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711.3587
Jean-Marc Bouclet
Jean-Marc Bouclet
Strichartz estimates on asymptotically hyperbolic manifolds
85 pages ; references added
null
null
null
math.AP math.DG
null
We prove local in time Strichartz estimates without loss for the restriction of the solution of the Schroedinger equation, outside a large compact set, on a class of asymptotically hyperbolic manifolds.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 14:26:51 GMT" }, { "version": "v2", "created": "Wed, 28 Nov 2007 13:04:17 GMT" } ]
2007-11-28T00:00:00
[ [ "Bouclet", "Jean-Marc", "" ] ]
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711.3588
Artem Lopatin Anatol'evich
A.A. Lopatin, A.N. Zubkov
Representations of quivers, their generalizations and invariants
31 pages; v2. Formulations of Theorems 3.16 and 5.9 are corrected
Herald of Omsk Univ., Special Issue: Combinatorial Methods of Algebra and Complexity of Computations (2008), 9-24
null
null
math.RT math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper is a survey on invariants of representations of quivers and their generalizations. We present the description of generating systems for invariants and relations between generators.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 14:34:42 GMT" }, { "version": "v2", "created": "Mon, 27 Apr 2009 15:10:09 GMT" } ]
2009-04-27T00:00:00
[ [ "Lopatin", "A. A.", "" ], [ "Zubkov", "A. N.", "" ] ]
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711.3589
Ngai Hang Chan
Boris Buchmann, Ngai Hang Chan
Asymptotic theory of least squares estimators for nearly unstable processes under strong dependence
Published in at http://dx.doi.org/10.1214/009053607000000136 the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Annals of Statistics 2007, Vol. 35, No. 5, 2001-2017
10.1214/009053607000000136
IMS-AOS-AOS0250
math.ST stat.TH
null
This paper considers the effect of least squares procedures for nearly unstable linear time series with strongly dependent innovations. Under a general framework and appropriate scaling, it is shown that ordinary least squares procedures converge to functionals of fractional Ornstein--Uhlenbeck processes. We use fractional integrated noise as an example to illustrate the important ideas. In this case, the functionals bear only formal analogy to those in the classical framework with uncorrelated innovations, with Wiener processes being replaced by fractional Brownian motions. It is also shown that limit theorems for the functionals involve nonstandard scaling and nonstandard limiting distributions. Results of this paper shed light on the asymptotic behavior of nearly unstable long-memory processes.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 14:35:36 GMT" } ]
2009-09-29T00:00:00
[ [ "Buchmann", "Boris", "" ], [ "Chan", "Ngai Hang", "" ] ]
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711.359
Tobias Huber
G. Heinrich, T. Huber, D. Maitre
Master Integrals for Fermionic Contributions to Massless Three-Loop Form Factors
12 pages, 1 figure. References added and updated. Appendix on evaluation of Mellin-Barnes integrals added. Version to appear in PLB
Phys.Lett.B662:344-352,2008
10.1016/j.physletb.2008.03.028
null
hep-ph
null
In this letter we continue the calculation of master integrals for massless three-loop form factors by giving analytical results for those integrals which are relevant for the fermionic contributions proportional to N_F^2, N_F*N, and N_F/N. Working in dimensional regularisation, we express one of the integrals in a closed form which is exact to all orders in epsilon, containing Gamma-functions and hypergeometric functions of unit argument. In all other cases we derive multiple Mellin-Barnes representations from which the coefficients of the Laurent expansion in epsilon are extracted in an analytical form. To obtain the finite part of the three-loop quark and gluon form factors, all coefficients through transcendentality six in the Riemann zeta-function have to be included.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 14:38:28 GMT" }, { "version": "v2", "created": "Thu, 27 Mar 2008 15:48:05 GMT" } ]
2008-11-26T00:00:00
[ [ "Heinrich", "G.", "" ], [ "Huber", "T.", "" ], [ "Maitre", "D.", "" ] ]
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711.3591
Uwe Aickelin
Uwe Aickelin, Edmund Burke and Jingpeng Li
An Estimation of Distribution Algorithm with Intelligent Local Search for Rule-based Nurse Rostering
null
Journal of the Operational Research Society, 58 (12), pp 1574-1585, 2007
10.1057/palgrave.jors.2602308
null
cs.NE cs.CE
null
This paper proposes a new memetic evolutionary algorithm to achieve explicit learning in rule-based nurse rostering, which involves applying a set of heuristic rules for each nurse's assignment. The main framework of the algorithm is an estimation of distribution algorithm, in which an ant-miner methodology improves the individual solutions produced in each generation. Unlike our previous work (where learning is implicit), the learning in the memetic estimation of distribution algorithm is explicit, i.e. we are able to identify building blocks directly. The overall approach learns by building a probabilistic model, i.e. an estimation of the probability distribution of individual nurse-rule pairs that are used to construct schedules. The local search processor (i.e. the ant-miner) reinforces nurse-rule pairs that receive higher rewards. A challenging real world nurse rostering problem is used as the test problem. Computational results show that the proposed approach outperforms most existing approaches. It is suggested that the learning methodologies suggested in this paper may be applied to other scheduling problems where schedules are built systematically according to specific rules
[ { "version": "v1", "created": "Thu, 22 Nov 2007 15:16:21 GMT" }, { "version": "v2", "created": "Mon, 3 Mar 2008 17:14:51 GMT" } ]
2010-07-05T00:00:00
[ [ "Aickelin", "Uwe", "" ], [ "Burke", "Edmund", "" ], [ "Li", "Jingpeng", "" ] ]
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711.3592
Sergio Navas-Concha
A. Bueno, J. Lozano, A.J. Melgarejo, F.J. Munoz, J.L. Navarro, S. Navas and A.G. Ruiz
Characterization of large area photomultipliers and its application to dark matter search with noble liquid detectors
19 pages, 14 figures
JINST 3:P01006,2008
10.1088/1748-0221/3/01/P01006
null
physics.ins-det
null
There is growing interest in the use of noble liquid detectors to study particle properties and search for new phenomena. In particular, they are extremely suitable for performing direct searches for dark matter. In this kind of experiments, the light produced after an interaction within the sensitive volume is usually read-out by photomultipliers. The need to go to masses in the tonne scale to explore deeper regions of the parameter space, calls for the use of large area photomultipliers. In this paper we address the need to perform laboratory calibration measurements of these large photomultipliers, in particular to characterize its behaviour at cryogenic temperatures where no reference from the manufacturer is available. We present comparative tests of phototubes from two companies. The tests are performed in conditions similar to those of operation in a real experiment. Measurements of the most relevant phototube parameters (quantum efficiency, gain, linearity, etc.) both at room and liquid Argon temperatures are reported. The results show that the studied phototubes comply with the stringent requirements posed by current dark matter searches performed with noble-liquid detectors.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 14:52:17 GMT" }, { "version": "v2", "created": "Tue, 27 Nov 2007 10:14:19 GMT" } ]
2009-12-10T00:00:00
[ [ "Bueno", "A.", "" ], [ "Lozano", "J.", "" ], [ "Melgarejo", "A. J.", "" ], [ "Munoz", "F. J.", "" ], [ "Navarro", "J. L.", "" ], [ "Navas", "S.", "" ], [ "Ruiz", "A. G.", "" ] ]
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711.3593
Nigel Hambly
N. C. Hambly, R. S. Collins, N. J. G. Cross, R. G. Mann, M. A. Read, E. T. W. Sutorius, I. A. Bond, J. Bryant, J. P. Emerson, A. Lawrence, J. M. Stewart, P. M. Williams, A. Adamson, S. Dye, P. Hirst, S. J. Warren
The WFCAM Science Archive
28 pages, 18 figures; accepted for publication in MNRAS (2007 November 8)
null
10.1111/j.1365-2966.2007.12700.x
null
astro-ph
null
We describe the WFCAM Science Archive (WSA), which is the primary point of access for users of data from the wide-field infrared camera WFCAM on the United Kingdom Infrared Telescope (UKIRT), especially science catalogue products from the UKIRT Infrared Deep Sky Survey (UKIDSS). We describe the database design with emphasis on those aspects of the system that enable users to fully exploit the survey datasets in a variety of different ways. We give details of the database-driven curation applications that take data from the standard nightly pipeline-processed and calibrated files for the production of science-ready survey datasets. We describe the fundamentals of querying relational databases with a set of astronomy usage examples, and illustrate the results.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 14:57:34 GMT" } ]
2009-11-13T00:00:00
[ [ "Hambly", "N. C.", "" ], [ "Collins", "R. S.", "" ], [ "Cross", "N. J. G.", "" ], [ "Mann", "R. G.", "" ], [ "Read", "M. A.", "" ], [ "Sutorius", "E. T. W.", "" ], [ "Bond", "I. A.", "" ], [ "Bryant", "J.", "" ], [ "Emerson", "J. P.", "" ], [ "Lawrence", "A.", "" ], [ "Stewart", "J. M.", "" ], [ "Williams", "P. M.", "" ], [ "Adamson", "A.", "" ], [ "Dye", "S.", "" ], [ "Hirst", "P.", "" ], [ "Warren", "S. J.", "" ] ]
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711.3594
Chunjing Xu
Chunjing Xu, Jianzhuang Liu, Xiaoou Tang
Clustering with Transitive Distance and K-Means Duality
13 pages, 6 figures
null
null
null
cs.LG
null
Recent spectral clustering methods are a propular and powerful technique for data clustering. These methods need to solve the eigenproblem whose computational complexity is $O(n^3)$, where $n$ is the number of data samples. In this paper, a non-eigenproblem based clustering method is proposed to deal with the clustering problem. Its performance is comparable to the spectral clustering algorithms but it is more efficient with computational complexity $O(n^2)$. We show that with a transitive distance and an observed property, called K-means duality, our algorithm can be used to handle data sets with complex cluster shapes, multi-scale clusters, and noise. Moreover, no parameters except the number of clusters need to be set in our algorithm.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 15:05:35 GMT" } ]
2007-11-26T00:00:00
[ [ "Xu", "Chunjing", "" ], [ "Liu", "Jianzhuang", "" ], [ "Tang", "Xiaoou", "" ] ]
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711.3595
Luzi Bergamin
Luzi Bergamin, Rene Meyer
Two-Dimensional Quantum Gravity with Boundary
8 p., no figures; to appear in the proceedings of the 4th workshop "Gravity, Astrophysics, and Strings at the Black Sea", Primorsko, June 10-16, 2007
null
null
MPP-2007-171
hep-th gr-qc
null
Using the recently found first order formulation of two-dimensional dilaton gravity with boundary, we perform a Hamiltonian analysis and subsequent path integral quantization. The importance of the boundary terms to obtain the correct quantum result are outlined and the quantum triviality of the theory is shown to hold with this modification as well. We compare with recent classical results and comment on further applications.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 15:15:46 GMT" } ]
2007-11-26T00:00:00
[ [ "Bergamin", "Luzi", "" ], [ "Meyer", "Rene", "" ] ]
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711.3596
Roberto Pittau
Giovanni Ossola, Costas G. Papadopoulos, Roberto Pittau
CutTools: a program implementing the OPP reduction method to compute one-loop amplitudes
Version published in JHEP
JHEP 0803:042,2008
10.1088/1126-6708/2008/03/042
null
hep-ph
null
We present a program that implements the OPP reduction method to extract the coefficients of the one-loop scalar integrals from a user defined (sub)-amplitude or Feynman Diagram, as well as the rational terms coming from the 4-dimensional part of the numerator. The rational pieces coming from the epsilon-dimensional part of the numerator are treated as an external input, and can be computed with the help of dedicated tree-level like Feynman rules. Possible numerical instabilities are dealt with the help of arbitrary precision routines, that activate only when needed.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 15:24:20 GMT" }, { "version": "v2", "created": "Mon, 7 Apr 2008 15:40:28 GMT" } ]
2011-05-05T00:00:00
[ [ "Ossola", "Giovanni", "" ], [ "Papadopoulos", "Costas G.", "" ], [ "Pittau", "Roberto", "" ] ]
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711.3597
Erik I. Broman
Erik I. Broman
Stochastic domination for a hidden Markov chain with applications to the contact process in a randomly evolving environment
Published in at http://dx.doi.org/10.1214/0091179606000001187 the Annals of Probability (http://www.imstat.org/aop/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Annals of Probability 2007, Vol. 35, No. 6, 2263-2293
10.1214/0091179606000001187
IMS-AOP-AOP319
math.PR
null
The ordinary contact process is used to model the spread of a disease in a population. In this model, each infected individual waits an exponentially distributed time with parameter 1 before becoming healthy. In this paper, we introduce and study the contact process in a randomly evolving environment. Here we associate to every individual an independent two-state, $\{0,1\},$ background process. Given $\delta_0<\delta_1,$ if the background process is in state $0,$ the individual (if infected) becomes healthy at rate $\delta_0,$ while if the background process is in state $1,$ it becomes healthy at rate $\delta_1.$ By stochastically comparing the contact process in a randomly evolving environment to the ordinary contact process, we will investigate matters of extinction and that of weak and strong survival. A key step in our analysis is to obtain stochastic domination results between certain point processes. We do this by starting out in a discrete setting and then taking continuous time limits.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 15:28:23 GMT" } ]
2011-11-10T00:00:00
[ [ "Broman", "Erik I.", "" ] ]
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711.3598
Heping He
Heping He, Thomas A. Severini
Higher-order asymptotic normality of approximations to the modified signed likelihood ratio statistic for regular models
Published in at http://dx.doi.org/10.1214/009053607000000307 the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Annals of Statistics 2007, Vol. 35, No. 5, 2054-2074
10.1214/009053607000000307
IMS-AOS-AOS0268
math.ST stat.TH
null
Approximations to the modified signed likelihood ratio statistic are asymptotically standard normal with error of order $n^{-1}$, where $n$ is the sample size. Proofs of this fact generally require that the sufficient statistic of the model be written as $(\hat{\theta},a)$, where $\hat{\theta}$ is the maximum likelihood estimator of the parameter $\theta$ of the model and $a$ is an ancillary statistic. This condition is very difficult or impossible to verify for many models. However, calculation of the statistics themselves does not require this condition. The goal of this paper is to provide conditions under which these statistics are asymptotically normally distributed to order $n^{-1}$ without making any assumption about the sufficient statistic of the model.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 15:28:33 GMT" } ]
2007-12-18T00:00:00
[ [ "He", "Heping", "" ], [ "Severini", "Thomas A.", "" ] ]
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711.3599
Bin Wang
Songbai Chen, Bin Wang, Ru-Keng Su and W.-Y Pauchy Hwang
Greybody Factors for Rotating Black Holes on Codimension-2 Branes
16 pages, 7 figures, minor modification, accepted for publication in JHEP
JHEP0803:019,2008
10.1088/1126-6708/2008/03/019
null
hep-th gr-qc
null
We study the absorption probability and Hawking radiation of the scalar field in the rotating black holes on codimension-2 branes. We find that finite brane tension modifies the standard results in Hawking radiation if compared with the case when brane tension is completely negligible. We observe that the rotation of the black hole brings richer physics. Nonzero angular momentum triggers the super-radiance which becomes stronger when the angular momentum increases. We also find that rotations along different angles influence the result in absorption probability and Hawking radiation. Compared with the black hole rotating orthogonal to the brane, in the background that black hole spins on the brane, its angular momentum brings less super-radiance effect and the brane tension increases the range of frequency to accommodate super-radiance. These information can help us know more about the rotating codimension-2 black holes.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 15:30:11 GMT" }, { "version": "v2", "created": "Mon, 3 Mar 2008 12:35:45 GMT" } ]
2008-11-26T00:00:00
[ [ "Chen", "Songbai", "" ], [ "Wang", "Bin", "" ], [ "Su", "Ru-Keng", "" ], [ "Hwang", "W. -Y Pauchy", "" ] ]
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711.36
Radoslav Rashkov
M. Kreuzer, C. Mayrhofer and R.C. Rashkov
A note on the Near Flat Limit for strings in the Maldacena-Nunez background
1+23 pages, introduction improved and clarifying comments added, references added, results remain unchanged
Phys.Rev.D77:066016,2008
10.1103/PhysRevD.77.066016
ESI-1983, TUW-07-16
hep-th
null
Recently Maldacena and Swanson suggested a new limit of string theory on the $AdS_5\times S^5$ background, the so called near flat space limit. The resulting reduced theory interpolates between the pp-wave limit and giant magnon type string solutions. It was shown that the reduced model possess many features of the original theory. On the other hand, theories with less supersymmetry are of great importance for the string/gauge theory correspondence. In this paper we study the near flat limit reduction of string theory on the Maldacena-Nunez background, which is dual to $\N=1$ Yang-Mills theory. The reduced model interpolates between the pp-wave limit and a certain magnon type subsector of the theory. The similarity of the structures of the reduced model obtained here and that by Maldacena and Swanson indicates the possibility of existence of integrable subsectors of strings on the Maldacena-Nunez background.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 15:31:31 GMT" }, { "version": "v2", "created": "Wed, 5 Dec 2007 13:15:26 GMT" }, { "version": "v3", "created": "Wed, 12 Dec 2007 14:27:25 GMT" }, { "version": "v4", "created": "Sun, 27 Jan 2008 17:32:09 GMT" } ]
2008-11-26T00:00:00
[ [ "Kreuzer", "M.", "" ], [ "Mayrhofer", "C.", "" ], [ "Rashkov", "R. C.", "" ] ]
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711.3601
Sijme-Jan Paardekooper
S.-J. Paardekooper, G. Mellema
Growing and moving low-mass planets in non-isothermal disks
Accepted for publication in Astronomy and Astrophysics
null
10.1051/0004-6361:20078592
null
astro-ph
null
We study the interaction of a low-mass planet with a protoplanetary disk with a realistic treatment of the energy balance by doing radiation-hydrodynamical simulations. We look at accretion and migration rates and compare them to isothermal studies. We used a three-dimensional version of the hydrodynamical method RODEO, together with radiative transport in the flux-limited diffusion approach. The accretion rate, as well as the torque on the planet, depend critically on the ability of the disk to cool efficiently. For densities appropriate to 5 AU in the solar nebula, the accretion rate drops by more than an order of magnitude compared to isothermal models, while at the same time the torque on the planet is positive, indicating outward migration. It is necessary to lower the density by a factor of 2 to recover inward migration and more than 2 orders of magnitude to recover the usual Type I migration. The torque appears to be proportional to the radial entropy gradient in the unperturbed disk. These findings are critical for the survival of protoplanets, and they should ultimately find their way into population synthesis models.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 15:35:52 GMT" } ]
2009-11-13T00:00:00
[ [ "Paardekooper", "S. -J.", "" ], [ "Mellema", "G.", "" ] ]
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711.3602
Nelson Pinto-Neto
Nelson Pinto-Neto and Bernardo M. O. Fraga
Cosmic acceleration from interaction of ordinary fluids
10 pages, no figures, accepted for publication in General Relativity and Gravitation
Gen.Rel.Grav.40:1653-1662,2008
10.1007/s10714-007-0565-5
null
gr-qc
null
Cosmological models with two interacting fluids, each satisfying the strong energy condition, are studied in the framework of classical General Relativity. If the interactions are phenomenologically described by a power law in the scale factor, the two initial interacting fluids can be equivalently substituted by two non interacting effective fluids, where one of them may violate the strong energy condition and/or have negative energy density. Analytical solutions of the Friedmann equations of this general setting are obtained and studied. One may have, depending on the scale where the interaction becomes important, non singular universes with early accelerated phase, or singular models with transition from decelerated to accelerated expansion at large scales. Among the first, there are bouncing models where contraction is stopped by the interaction. In the second case, one obtains dark energy expansion rates without dark energy, like $\Lambda$CDM or phantomic accelerated expansions without cosmological constant or phantoms, respectively.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 15:36:44 GMT" } ]
2008-11-26T00:00:00
[ [ "Pinto-Neto", "Nelson", "" ], [ "Fraga", "Bernardo M. O.", "" ] ]
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711.3603
Chiaki Hikage
Chiaki Hikage, Peter Coles, Margherita Grossi, Lauro Moscardini, Klaus Dolag, Enzo Branchini and Sabino Matarrese
The Effect of Primordial Non--Gaussianity on the Topology of Large-Scale Structure
9 pages, 3 figures, accepted for publication in MNRAS
Mon.Not.Roy.Astron.Soc.385:1613,2008
10.1111/j.1365-2966.2008.12944.x
null
astro-ph
null
We study the effect of primordial non-Gaussianity on the development of large-scale cosmic structure using high-resolution N-body simulations. In particular, we focus on the topological properties of the "cosmic web", quantitatively characterized by the Minkowski Functionals, for models with quadratic non-linearities with different values of the usual non-Gaussianity parameter fNL. In the weakly non-linear regime, we find that analytic formulae derived from perturbation theory agree with the numerical results within a few percent of the amplitude of each MF when |fNL|<1000. In the non-linear regime, the detailed behavior of the MFs as functions of threshold density deviates more strongly from the analytical curves, while the overall amplitude of the primordial non-Gaussian effect remains comparable to the perturbative prediction. When smaller-scale information is included, the influence of primordial non-Gaussianity becomes increasingly significant statistically due to decreasing sample variance. We find that the effect of the primordial non-Gaussianity with |fNL|=50 is comparable to the sample variance of mass density fields with a volume of 0.125(Gpc/h)^3 when they are smoothed by Gaussian filter at a scale of 5Mpc/h. The detectability of this effect in actual galaxy surveys will strongly depend upon residual uncertainties in cosmological parameters and galaxy biasing.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 16:00:38 GMT" }, { "version": "v2", "created": "Thu, 10 Jan 2008 20:32:09 GMT" } ]
2011-06-22T00:00:00
[ [ "Hikage", "Chiaki", "" ], [ "Coles", "Peter", "" ], [ "Grossi", "Margherita", "" ], [ "Moscardini", "Lauro", "" ], [ "Dolag", "Klaus", "" ], [ "Branchini", "Enzo", "" ], [ "Matarrese", "Sabino", "" ] ]
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711.3604
Floris van der Tak
Floris van der Tak (SRON Groningen)
Recent Astrochemical Results on Star-Forming Regions
Contribution to proceedings of conference "Massive Star Formation: Observations confront Theory" (Heidelberg 2007); 8 DIN A4 pages. Version 2: some references added
null
null
null
astro-ph
null
This review discusses recent results on the astrochemistry of (mostly high-mass) star-forming regions. After an introduction on the use of chemistry in astrophysics and some basic concepts of astrochemistry, specific results are presented. Highlighted areas are the use of chemistry in the search for massive circumstellar disks, the interaction of molecular clouds with cosmic rays, and the feedback effects of protostellar irradiation on the parent molecular cloud. The review concludes with a discussion of future observational opportunities.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 10:37:34 GMT" } ]
2007-11-26T00:00:00
[ [ "van der Tak", "Floris", "", "SRON Groningen" ] ]
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711.3605
Eric Laporte
Eric Laporte (IGM-LabInfo), Christian Lecl\`ere (IGM-LabInfo), Maria Carmelita P. Dias
Very strict selectional restrictions
null
Dans Proceedings - Very strict selectional restrictions. A Comparison between Portuguese and French, Itatiaia : Br\'esil (2006)
null
null
cs.CL
null
We discuss the characteristics and behaviour of two parallel classes of verbs in two Romance languages, French and Portuguese. Examples of these verbs are Port. abater [gado] and Fr. abattre [b\'etail], both meaning "slaughter [cattle]". In both languages, the definition of the class of verbs includes several features: - They have only one essential complement, which is a direct object. - The nominal distribution of the complement is very limited, i.e., few nouns can be selected as head nouns of the complement. However, this selection is not restricted to a single noun, as would be the case for verbal idioms such as Fr. monter la garde "mount guard". - We excluded from the class constructions which are reductions of more complex constructions, e.g. Port. afinar [instrumento] com "tune [instrument] with".
[ { "version": "v1", "created": "Thu, 22 Nov 2007 15:54:31 GMT" } ]
2007-11-26T00:00:00
[ [ "Laporte", "Eric", "", "IGM-LabInfo" ], [ "Leclère", "Christian", "", "IGM-LabInfo" ], [ "Dias", "Maria Carmelita P.", "" ] ]
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711.3606
Je-An Gu
Je-an Gu
Oscillating Quintessence
4 pages, LaTeX
null
null
null
astro-ph
null
An oscillating scalar field as a quintessence model for dark energy is proposed. The case of a power-law potential is particularly intriguing and is the focus of the present article. In this model the equation of state w_{OQ} of dark energy is a constant determined simply by the power n in the potential through w_{OQ} = (n-2)/(n+2). Accordingly, when 0 < n < 1, the oscillating quintessence can provide repulsive gravity and drive the cosmic acceleration. The condition for oscillation and the constraints from observations are investigated. For this new scenario a specific natural model with much less fine tuning is presented.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 18:07:47 GMT" } ]
2007-11-26T00:00:00
[ [ "Gu", "Je-an", "" ] ]
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711.3607
Charles Bonatto
Mauro G. Rickes, Miriani G. Pastoriza and Charles Bonatto
Star formation, metallicity gradient and ionized gas: clues to the formation of the elliptical galaxies NGC6868 and NGC5903
11 pages and 12 figs; accepted by MNRAS
null
10.1111/j.1365-2966.2007.12724.x
null
astro-ph
null
The stellar population, metallicity distribution and ionized gas in the elliptical galaxies NGC 6868 and NGC 5903 are investigated in this paper by means of long-slit spectroscopy and stellar population synthesis. Lick indices in both galaxies present a negative gradient indicating an overabundance of Fe, Mg, Na and TiO in the central parts with respect to the external regions. Concerning the emitting gas conspicuously detected in NGC 6868, we test three hypotheses as ionizing source: an H II region, post-AGB stars and an Active Galactic Nucleus (AGN). Diagnostic diagrams involving the ratios $[NII]_{\lambda6584}/H\alpha$, $[OI]_{\lambda6300}/H\alpha$ and $[SII]_{\lambda6717,31}/H\alpha$, indicate that values measured in the central region of NGC 6868 are typical of LINERs. Together with the stellar population synthesis, this result suggests that the main source of gas ionization in NGC 6868 is non-thermal, produced by a low-luminosity AGN, probably with some contribution of shocks to explain ionization at distances of $\sim3.5$ kpc from the nucleus.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 16:00:32 GMT" } ]
2009-11-13T00:00:00
[ [ "Rickes", "Mauro G.", "" ], [ "Pastoriza", "Miriani G.", "" ], [ "Bonatto", "Charles", "" ] ]
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