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66

Sep 24, 2013
09/13

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Leo Radzihovsky; A. M. Ettouhami; Karl Saunders; John Toner

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Ferromagnetic order in superconductors can induce a {\em spontaneous} vortex (SV) state. For external field ${\bf H}=0$, rotational symmetry guarantees a vanishing tilt modulus of the SV solid, leading to drastically different behavior than that of a conventional, external-field-induced vortex solid. We show that quenched disorder and anharmonic effects lead to elastic moduli that are wavevector-dependent out to arbitrarily long length scales, and non-Hookean elasticity. The latter implies that...

Source: http://arxiv.org/abs/cond-mat/0103204v2

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Jul 20, 2013
07/13

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Brian G. Keating; Christopher W. O'Dell; Angelica de Oliveira-Costa; Slade Klawikowski; Nate Stebor; Lucio Piccirillo; Max Tegmark; Peter T. Timbie

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We present an upper limit on the polarization of the Cosmic Microwave Background at 7 degree angular scales in the frequency band between 26 and 36 GHz, produced by the POLAR experiment. The campaign produced a map of linear polarization over the R.A. range 112 degrees - 275 degrees at declination 43degrees. The model-independent upper limit on the E-mode polarization component of the CMB at angular scales l = 2 - 20 is 10 microKelvin (95% confidence). The corresponding limit for the B-mode is...

Source: http://arxiv.org/abs/astro-ph/0107013v1

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Sep 22, 2013
09/13

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B. H. J. McKellar; G. J. Stephenson Jr; T. Goldman; M. Garbutt

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The usual see-saw mechanism for the generation of light neutrino masses is based on the assumption that all of the flavours of right-handed (more properly, sterile) neutrinos are heavy. If the sterile Majorana mass matrix is singular, one or more of the sterile neutrinos will have zero mass before mixing with the active (left-handed) neutrinos and be light after that mixing is introduced. In particular, a rank 1 sterile mass matrix leads naturally to two pseudo-Dirac pairs, one very light...

Source: http://arxiv.org/abs/hep-ph/0106121v2

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Sep 22, 2013
09/13

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Janko Gravner; Craig A. Tracy; Harold Widom

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We consider a model of interface growth in two dimensions, given by a height function on the sites of the one--dimensional integer lattice. According to the discrete time update rule, the height above the site $x$ increases to the height above $x-1$, if the latter height is larger; otherwise the height above $x$ increases by 1 with probability $p_x$. We assume that $p_x$ are chosen independently at random with a common distribution $F$, and that the initial state is such that the origin is far...

Source: http://arxiv.org/abs/math/0011150v2

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Jul 20, 2013
07/13

by
Paolo Lisca; Andras I. Stipsicz

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This paper has been withdrawn by the authors, due to a mistake pointed out by Lenny Ng and Josh Sabloff.

Source: http://arxiv.org/abs/math/0009014v3

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Sep 22, 2013
09/13

by
D. Brecher; P. M. Saffin

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We comment on the recent papers by Costa et al and Emparan, which show how one might generate supergravity solutions describing certain dielectric branes in ten dimensions. The ``basic'' such solutions describe either N fundamental strings or N D4-branes expanding into a D6-brane, with topology M^2 x S^5 or M^5 x S^2 respectively. Treating these solutions in a unified way, we note that they allow for precisely two values of the radius of the relevant sphere, and that the solution with the...

Source: http://arxiv.org/abs/hep-th/0106206v2

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Jul 20, 2013
07/13

by
Ulrich Mohrhoff

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Epistemic interpretations of quantum mechanics fail to address the puzzle posed by the occurrence of probabilities in a fundamental physical theory. This is a puzzle about the physical world, not a puzzle about our relation to the physical world. Its solution requires a new concept of physical space, presented in this article. An examination of how the mind and the brain construct the phenomenal world reveals the psychological and neurobiological reasons why we think about space in ways that...

Source: http://arxiv.org/abs/quant-ph/0107005v1

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Jul 20, 2013
07/13

by
Zhi-zhong Xing

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We point out two simple but instructive possibilities to construct the charged lepton and neutrino mass matrices, from which the nearly bi-maximal neutrino mixing with large T violation can naturally emerge. The two lepton mixing scenarios are compatible very well with current experimental data on solar and atmospheric neutrino oscillations, and one of them may lead to an observable T-violating asymmetry between \nu_\mu --> \nu_e and \nu_e --> \nu_\mu transitions in the long-baseline...

Source: http://arxiv.org/abs/hep-ph/0107005v1

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Jul 20, 2013
07/13

by
N. H. Buttimore; E. Leader; T. L. Trueman

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A study of the spin asymmetries for polarized elastic proton proton collisions in the electromagnetic hadronic interference (CNI) region of momentum transfer provides a method of self calibration of proton polarization. The method can be extended to non-identical spin half scattering so that, in principle, the polarization of a proton may be obtained through an analysis of its elastic collision with a different polarized particle, helium 3 for instance. Sufficiently large CNI spin asymmetries...

Source: http://arxiv.org/abs/hep-ph/0107013v1

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Jul 20, 2013
07/13

by
V. A. De Lorenci; R. Klippert

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Working with electrodynamics in the geometrical optics approximation we derive the expression representing an effectively curved geometry which guides the propagation of electromagnetic waves in material media whose physical properties depend on an external electric field. The issue of birefringence is addressed, and the trajectory of the extraordinary ray is explicitly worked out. Quite general curves are obtained for the path of the light ray by suitably setting an electric field.

Source: http://arxiv.org/abs/gr-qc/0107008v1

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Jul 20, 2013
07/13

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Catalin D. Spataru; Miguel A. Cazalilla; Angel Rubio; Lorin X. Benedict; Pedro M. Echenique; Steven G. Louie

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We report ab initio calculation of quasiparticle lifetimes in graphite, as determined from the imaginary part of the self-energy operator within the GW aproximation. The inverse lifetime in the energy range from 0.5 to 3.5 eV above the Fermi level presents significant deviations from the quadratic behavior naively expected from Fermi liquid theory. The deviations are explained in terms of the unique features of the band structure of this material. We also discuss the experimental results from...

Source: http://arxiv.org/abs/cond-mat/0107043v1

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Sep 23, 2013
09/13

by
Andris Ambainis; Ronald de Wolf

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We compare classical and quantum query complexities of total Boolean functions. It is known that for worst-case complexity, the gap between quantum and classical can be at most polynomial. We show that for average-case complexity under the uniform distribution, quantum algorithms can be exponentially faster than classical algorithms. Under non-uniform distributions the gap can even be super-exponential. We also prove some general bounds for average-case complexity and show that the average-case...

Source: http://arxiv.org/abs/quant-ph/9904079v3

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Jul 20, 2013
07/13

by
Christos Leonidopoulos

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We present results on the mixing parameter Delta-m_d and tests of the CPT symmetry in the B0_d anti-B0_d mixing from the time evolution of dilepton events on the Upsilon(4S) resonance. The analysis is based on a 5.9 fb^{-1} data sample collected by the Belle detector at the KEKB accelerator from January to July of 2001. We obtain Delta-m_d = 0.463 +- 0.008 (stat) +- 0.016 (syst) ps^{-1}. No evidence for CPT violation is found. This is the first determination of Delta-m_d from time evolution...

Source: http://arxiv.org/abs/hep-ex/0107001v1

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Sep 18, 2013
09/13

by
Soon-Tae Hong; Young-Jai Park; Kuniharu Kubodera; Fred Myhrer

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The Batalin-Fradkin-Tyutin (BFT) scheme, which is an improved version of Dirac quantization, is applied to the $CP^1$ model, and the compact form of a nontrivial first-class Hamiltonian is directly obtained by introducing the BFT physical fields. We also derive a BRST-invariant gauge fixed Lagrangian through the standard path-integral procedure. Furthermore, performing collective coordinate quantization we obtain energy spectrum of rigid rotator in the $CP^1$ model. Exploiting the Hopf bundle,...

Source: http://arxiv.org/abs/hep-th/0006227v2

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Jul 20, 2013
07/13

by
N. Mukunda; Arvind; S. Chaturvedi; R. Simon

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We investigate the geometric phases and the Bargmann invariants associated with a multi-level quantum systems. In particular, we show that a full set of `gauge-invariant' objects for an $n$-level system consists of $n$ geometric phases and ${1/2}(n-1)(n-2)$ algebraically independent 4-vertex Bargmann invariants. In the process of establishing this result we develop a canonical form for U(n) matrices which is useful in its own right. We show that the recently discovered `off-diagonal' geometric...

Source: http://arxiv.org/abs/quant-ph/0107006v1

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Sep 22, 2013
09/13

by
Z. Bajnok; L. Palla; G. Takacs

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The sine-Gordon model with Neumann boundary condition is investigated. Using the bootstrap principle the spectrum of boundary bound states is established. Somewhat surprisingly it is found that Coleman-Thun diagrams and bound state creation may coexist. A framework to describe finite size effects in boundary integrable theories is developed and used together with the truncated conformal space approach to confirm the bound states and reflection factors derived by bootstrap.

Source: http://arxiv.org/abs/hep-th/0106069v3

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Jul 20, 2013
07/13

by
V. S. Fadin; R. Fiore

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The method of calculation of effective vertices of interaction of the Reggeized gluon and quark with particles in QCD in the next-to-leading order is developed. The method is demonstrated in the case of already known vertices of both gluon-gluon and quark-quark transitions in the scattering of gluons and quarks on the Reggeized gluon. It is used for the calculation of the gluon-quark transition in the scattering on the Reggeized quark.

Source: http://arxiv.org/abs/hep-ph/0107010v1

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Jul 20, 2013
07/13

by
Andreu Alibes; Javier Labay; Ramon Canal

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We extend our model of chemical evolution that successfully account for the main observables in the solar neighborhood (Alibes, Labay & Canal 2001) to the whole Milky Way halo and disk. We assume an inside-out scenario for the assembling of the Galaxy through the infall of external material. Two different compositions of the infalling material have been considered: primordial and slightly metal-enriched (0.1 Z_{\sun}). Our calculations follow the evolution of 76 isotopes up to the Iron...

Source: http://arxiv.org/abs/astro-ph/0107016v1

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Jul 20, 2013
07/13

by
P. Valente; H. Failache; A. Lezama

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The temporal evolutions of coherent resonances corresponding to electromagnetically induced transparency (EIT) and absorption (EIA) were observed in a Hanle absorption experiment carried on the $D_{2}$ lines of $% ^{87}$Rb vapor by suddenly turning the magnetic field on or off. The main features of the experimental observations are well reproduced by a theoretical model based on Bloch equation where the atomic level degeneracy has been fully accounted for. Similar (opposite phase) evolutions...

Source: http://arxiv.org/abs/quant-ph/0107007v1

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Sep 22, 2013
09/13

by
Lenhard L. Ng

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We establish tools to facilitate the computation and application of the Chekanov-Eliashberg differential graded algebra (DGA), a Legendrian-isotopy invariant of Legendrian knots in standard contact three-space. More specifically, we reformulate the DGA in terms of front projection, and introduce the characteristic algebra, a new invariant derived from the DGA. We use our techniques to distinguish between several previously indistinguishable Legendrian knots and links.

Source: http://arxiv.org/abs/math/0011265v2

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Sep 24, 2013
09/13

by
Ralf Hofmann

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Based on general renormalization group arguments, Polyakov's loop-space formalism, and recent analytical lattice arguments, suggesting, after Abelian gauge fixing, a description of pure gluodynamics by means of a Georgi-Glashow like model, the corresponding vacuum fields are defined in a non-local way. Using lattice information on the gauge invariant field strength correlator in full QCD, the resolution scale $\La_b$, at which these fields become relevant in the vacuum, is determined. For SU(3)...

Source: http://arxiv.org/abs/hep-ph/0103279v4

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42

Sep 18, 2013
09/13

by
Martin White; C. S. Kochanek

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Weak gravitational lensing provides a means of testing the long-range properties of gravity. Current measurements are consistent with standard Newtonian gravity and inconsistent with substantial modifications on Mpc scales. The data allows long range gravity to deviate from a 1/r potential only on scales where standard cosmology would use normal gravity but be dominated by dark matter. Thus, abnormal gravity theories must introduce two fine-tuning scales -- an inner scale to explain flat...

Source: http://arxiv.org/abs/astro-ph/0105227v2

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Jul 20, 2013
07/13

by
Christopher J. Miller; Christopher Genovese; Robert C. Nichol; Larry Wasserman; Andrew Connolly; Daniel Reichart; Andrew Hopkins; Jeff Schneider; Andrew Moore

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The False Discovery Rate (FDR) is a new statistical procedure to control the number of mistakes made when performing multiple hypothesis tests, i.e. when comparing many data against a given model hypothesis. The key advantage of FDR is that it allows one to a priori control the average fraction of false rejections made (when comparing to the null hypothesis) over the total number of rejections performed. We compare FDR to the standard procedure of rejecting all tests that do not match the null...

Source: http://arxiv.org/abs/astro-ph/0107034v1

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90

Sep 21, 2013
09/13

by
Wen-Tai Chiang; F. Tabakin; T. -S. H. Lee; B. Saghai

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A coupled-channel (CC) approach has been developed to investigate kaon photoproduction on the nucleon. In addition to direct K+ Lambda production, our CC approach accounts for strangeness production including K+ Lambda final state interactions with both pi0 p and pi+ n intermediate states. Calculations for the gamma p --> K+ Lambda reaction have been performed, and compared with the recent data from SAPHIR, with emphasis on the CC effects. We show that the CC effects are significant at the...

Source: http://arxiv.org/abs/nucl-th/0104052v2

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48

Sep 22, 2013
09/13

by
J. J. Halliwell; J. Thorwart

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The Klein-Gordon equation is a useful test arena for quantum cosmological models described by the Wheeler-DeWitt equation. We use the decoherent histories approach to quantum theory to obtain the probability that a free relativistic particle crosses a section of spacelike surface. The decoherence functional is constructed using path integral methods with initial states attached using the (positive definite) ``induced'' inner product between solutions to the constraint equation. The notion of...

Source: http://arxiv.org/abs/gr-qc/0106095v2

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Jul 20, 2013
07/13

by
Brian E. Wood; Margarita Karovska; Warren Hack

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We present ultraviolet spectra of Mira's companion star from the Space Telescope Imaging Spectrograph (STIS) instrument on board the Hubble Space Telescope (HST). The companion is generally assumed to be a white dwarf surrounded by an accretion disk fed by Mira's wind, which dominates the UV emission from the system. The STIS UV spectrum is dominated by numerous, narrow H2 lines fluoresced by H I Ly-alpha, which were not detected in any of the numerous observations of Mira B by the...

Source: http://arxiv.org/abs/astro-ph/0107032v1

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113

Jul 20, 2013
07/13

by
F. -P. Schilling

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A measurement is presented of diffractive dijet production in deep-inelastic scattering (DIS) interactions at HERA of the type ep-->eXY, where the X system is separated by a large rapidity gap from a low-mass leading baryonic system Y. The data are consistent with QCD factorisation in diffractive DIS and yield tight constraints on both shape and normalisation of the diffractive gluon distribution. The data are able to distinguish between various models for diffractive DIS and are in...

Source: http://arxiv.org/abs/hep-ex/0107002v1

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90

Jul 20, 2013
07/13

by
Marcello Ciafaloni; Martina Taiuti; A. H. Mueller

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The high-energy behaviour of two-scale hard processes is investigated in the framework of small-x models with running coupling, having the Airy diffusion model as prototype. We show that, in some intermediate high-energy regime, the perturbative hard Pomeron exponent determines the energy dependence, and we prove that diffusion corrections have the form hinted at before in particular cases. We also discuss the breakdown of such regime at very large energies, and the onset of the...

Source: http://arxiv.org/abs/hep-ph/0107009v1

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72

Jul 20, 2013
07/13

by
L. Mornas

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We calculate dispersion relations and propagators for the $\sigma$, $\omega$, $\pi$, $\rho$, $\delta$, $\eta$ and $a_1$ mesons in relativistic, dense, hot, symmetric nuclear matter. In addition to the usual mixing of the $\sigma-\omega$ system, we obtain mixing of the $\delta$ with the longitudinal $\rho$ mode and of the tranverse $\rho$ with the transverse $a_1$ mode. Finally, the component of the $a_1$ polarization along the transferred momentum modifies the in-medium pion propagator in a way...

Source: http://arxiv.org/abs/nucl-th/0107005v1

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Sep 21, 2013
09/13

by
L. Girlanda

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We express the two-massless-flavor Gell-Mann--Oakes--Renner ratio in terms of low-energy pi-pi observables, including the O(p^6) double chiral logarithms of generalized chiral perturbation theory. Their contribution is sizeable and tends to compensate the one from the single chiral logarithms. However it is not large enough to spoil the convergence of the chiral expansion. As a signal of reduced theoretical uncertainty, we find that the scale dependence from the one-loop single logarithms is...

Source: http://arxiv.org/abs/hep-ph/0104270v2

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Jul 20, 2013
07/13

by
H. Aranda-Espinoza; H. Bermudez; F. S. Bates; D. Discher

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Self-assembled membranes of amphiphilic diblock copolymers enable comparisons of cohesiveness with lipid membranes over the range of hydrophobic thicknesses d=3-15 nm. At zero mechanical tension the breakdown potential V_c for polymersomes with d=15 nm is 9 V compared to 1 V for liposomes with d=3 nm. Nonetheless, electromechanical stresses at breakdown universally exhibit a square dependence on V_c, and membrane capacitance shows the expected strong d-dependence, conforming to simple...

Source: http://arxiv.org/abs/cond-mat/0107039v1

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Jul 20, 2013
07/13

by
Laurent Granvilliers; Eric Monfroy

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Constraint propagation is a general algorithmic approach for pruning the search space of a CSP. In a uniform way, K. R. Apt has defined a computation as an iteration of reduction functions over a domain. He has also demonstrated the need for integrating static properties of reduction functions (commutativity and semi-commutativity) to design specialized algorithms such as AC3 and DAC. We introduce here a set of operators for modeling compositions of reduction functions. Two of the major goals...

Source: http://arxiv.org/abs/cs/0107002v1

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53

Sep 24, 2013
09/13

by
CP-PACS Collaboration; A. Ali Khan; S. Aoki; R. Burkhalter; S. Ejiri; M. Fukugita; S. Hashimoto; N. Ishizuka; Y. Iwasaki; K. Kanaya; T. Kaneko; Y. Kuramashi; T. Manke; K. -I. Nagai; M. Okamoto; M. Okawa; H. P. Shanahan; Y. Taniguchi; A. Ukawa; T. Yoshié

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We present results of a first study of equation of state in finite-temperature QCD with two flavors of Wilson-type quarks. Simulations are made on lattices with temporal size $N_t=4$ and 6, using an RG-improved action for the gluon sector and a meanfield-improved clover action for the quark sector. The lines of constant physics corresponding to fixed values of the ratio $m_{\rm PS}/m_{\rm V}$ of the pseudo-scalar to vector meson masses at zero temperature are determined, and the beta functions...

Source: http://arxiv.org/abs/hep-lat/0103028v2

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Jul 20, 2013
07/13

by
M. K. Mak; T. Harko

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The general solution of the gravitational field equations in the flat Friedmann-Robertson-Walker geometry is obtained in the framework of the full Israel-Stewart-Hiscock theory for a bulk viscous stiff cosmological fluid, with bulk viscosity coefficient proportional to the energy density.

Source: http://arxiv.org/abs/gr-qc/0107004v1

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Jul 20, 2013
07/13

by
V. Zlatic; J. K. Freericks; R. Lemanski; G. Czycholl

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The exact solution for the thermodynamic and dynamic properties of the infinite-dimensional multi-component Falicov-Kimball model for arbitrary concentration of d- and f-electrons is presented. The emphasis is on a descriptive derivation of important physical quantities by the equation of motion technique. We provide a thorough discussion of the f-electron Green function and of the susceptibility to spontaneous hybridization. The solutions are used to illustrate different physical systems...

Source: http://arxiv.org/abs/cond-mat/0107040v1

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Sep 18, 2013
09/13

by
D. Blaschke; G. Burau; Yu. L. Kalinovsky; P. Maris; P. C. Tandy

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Finite temperature spatial $\bar q q$ correlation modes in the $\pi$ and $\rho$ channels are studied with the rainbow-ladder truncated quark Dyson-Schwinger equation and Bethe-Salpeter equation in the Matsubara formalism. To retain the finite range of the effective interaction while facilitating summation over fermion Matsubara modes necessary to ensure continuity at {T=0}, a separable kernel is used. The model is fixed by {T=0} properties and it implements dynamical chiral symmetry breaking...

Source: http://arxiv.org/abs/nucl-th/0002024v2

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Jul 20, 2013
07/13

by
P. Ebenfelt; B. Lamel; D. Zaitsev

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We show that germs of local real-analytic CR automorphisms of a real-analytic hypersurface $M$ in $\C^2$ at a point $p\in M$ are uniquely determined by their jets of some finite order at $p$ if and only if $M$ is not Levi-flat near $p$. This seems to be the first necessary and sufficient result on finite jet determination and the first result of this kind in the infinite type case. If $M$ is of finite type at $p$, we prove a stronger assertion: the local real-analytic CR automorphisms of $M$...

Source: http://arxiv.org/abs/math/0107013v1

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Jul 20, 2013
07/13

by
A. Damascelli; D. H. Lu; Z. -X. Shen

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We review our angle-resolved photoemission spectroscopy (ARPES) results on different layered oxide superconductors, and on their insulating parent compounds. The low energy excitations are discussed with emphasis on some of the most recent issues, such as the Fermi surface and remnant Fermi surface, the pseudogap and d-wave-like dispersion, and lastly the signatures in the ARPES spectra of multiple electronic components, many body effects, and the superfluid density. We will focus on systematic...

Source: http://arxiv.org/abs/cond-mat/0107042v1

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Jul 20, 2013
07/13

by
Michael J. West

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The present-day globular cluster populations of galaxies reflect the cumulative effects of billions of years of galaxy evolution via such processes as mergers, tidal stripping, accretion, and in some cases the partial or even complete destruction of other galaxies. If large galaxies have grown by consuming their smaller neighbors, or by accreting material stripped from other galaxies, then their observed globular cluster systems are an amalgamation of the globular cluster systems of their...

Source: http://arxiv.org/abs/astro-ph/0107012v1

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158

Jul 20, 2013
07/13

by
B. M. Zupnik

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In harmonic superspace, the classical equations of motion of $D=4, N=2$ supersymmetric Yang-Mills theory for Minkowski and Euclidean spaces are analyzed. We study dual superfield representations of equations and subsidiary conditions corresponding to classical SYM-solutions with different symmetries. In particular, alternative superfield constructions of self-dual and static solutions are described in the framework of the harmonic approach.

Source: http://arxiv.org/abs/hep-th/0107012v1

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Sep 24, 2013
09/13

by
A. Prados; J. J. Brey

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The dynamical behavior of a kind of models with hierarchically constrained dynamics is investigated. The models exhibit many properties resembling real structural glasses. In particular, we focus on the study of time-dependent temperature processes. In cooling processes, a phenomenon analogous to the laboratory glass transition appears. The residual properties are analytically evaluated, and the concept of fictive temperature is discussed on a physical base. The evolution of the system in...

Source: http://arxiv.org/abs/cond-mat/0103325v2

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Jul 20, 2013
07/13

by
T. Negishi; T. Onaka; K. -W. Chan; T. L. Roellig

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Far-infrared spectra (43-197um) of 34 nearby galaxies obtained by the Long Wavelength Spectrometer (LWS) aboard the Infrared Space Observatory (ISO) were analyzed to investigate the general properties of interstellar matter in galaxies. The line fluxes of [CII]158um and [NII]122um relative to the total far-infrared flux (FIR) decrease as the far-infrared color becomes bluer, while the ratio of the [OI]63um flux to FIR does not show a systematic trend with the color. The [OIII]88um to FIR ratio...

Source: http://arxiv.org/abs/astro-ph/0107019v1

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Jul 20, 2013
07/13

by
Roberto Casadio

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We study the collapse of a self-gravitating thick shell of bosons coupled to a scalar radiation field. Due to the non-adiabaticity of the collapse, the shell (quantum) internal degrees of freedom absorb energy from the (classical) gravitational field and are excited. The excitation energy is then emitted in the form of bursts of (thermal) radiation and the corresponding backreaction on the trajectory is estimated.

Source: http://arxiv.org/abs/gr-qc/0107006v1

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Jul 20, 2013
07/13

by
F. Dalfovo; S. Stringari

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Helium nanodroplets and trapped Bose-Einstein condensates in dilute atomic gases offer complementary views of fundamental aspects of quantum many-body systems. We discuss analogies and differences, stressing their common theoretical background and peculiar features. We briefly review some relevant concepts, such as the meaning of superfluidity in finite systems, the behavior of elementary excitations and collective modes, as well as rotational properties and quantized vorticity.

Source: http://arxiv.org/abs/cond-mat/0107027v1

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Jul 20, 2013
07/13

by
V. N. Bogomolov

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The paper considers the possibility of superconductivity setting in when the distance a_B between molecules (atoms) is such that a_F < a_B < a_W, where a_F and a_W are the equilibrium separations in Fermi metals and van der Waals insulators. The last has no band sructure. This is the binding energy region 40--60 kJ/mol. However, neither stretch of metals ("dilution" by insulators) nor compression of insulators to a=a_B produce substances stable under normal conditions. It was...

Source: http://arxiv.org/abs/cond-mat/0107029v1

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82

Jul 20, 2013
07/13

by
J. R. Anglin

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Prepare a two-species BEC in a perfectly phase-mixed state. By applying Rabi drives, one can tune the range of wavelengths of phase-separating excitations that are dynamically unstable. Yada yada yada, this determines the characteristic sizes of the eventual spin domains. The trapping potential is neglected because it makes life hard, but of course this is a terrible approximation, and the results are of only inspirational value. Since this is thus a rather trivial calculation, the very modest...

Source: http://arxiv.org/abs/cond-mat/0107041v2

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61

Sep 22, 2013
09/13

by
David Delepine; Francesco Vissani

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Motivated by the interest in lepton number violating processes, we study the connection between the rate of Z -> mu e decay and those of the low-energy processes mu ->3 e, and mu -> e conversion in nuclear field. We show that if the vector or axial Z form factors are dominant, Br(Z->mu e) is not observable, while if the Z dipole form factors are dominant, the relatively weak indirect bound Br(Z->mu e) mu e with Z->tau e and Z->tau mu decays, and suggest a simple scaling law...

Source: http://arxiv.org/abs/hep-ph/0106287v2

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60

Jul 20, 2013
07/13

by
Bikash Chandra Paul

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A new cosmological solution of the gravitational field equations in the generalized Randall-Sundrum model for an anisotropic brane with Bianchi I geometry and with perfect fluid as matter sources is presented. The matter is described by a scalar field. The solution admits inflationary era and at a later epoch the anisotropy of the universe washes out. We obtain two classes of cosmological scenario, in the first case universe evolves from singularity and in the second case universe expands...

Source: http://arxiv.org/abs/gr-qc/0107005v1

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Sep 22, 2013
09/13

by
C. R. Morton; A. C. Berriman; R. D. Butt; M. Dasgupta; D. J. Hinde; A. Godley; J. O. Newton; K. Hagino

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The shape of the measured barrier distribution for the ^{34}S + ^{168}Er reaction is analysed using the coupled-channels description. The ^{168}Er nucleus is a good candidate to test current fusion models description of deformation since it has a large quadrupole deformation with an insignificant hexadecapole deformation. Coupling to weaker channels, the 2^+_1 state in ^{34}S, the 3^-_1 state in ^{168}Er, and the pair neutron transfer channel, all were found to have little influence on the...

Source: http://arxiv.org/abs/nucl-ex/0106023v2

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93

Jul 20, 2013
07/13

by
B. E. McArthur; G. F. Benedict; J. Lee; W. F. van Altena; C. L. Slesnick; J. Rhee; R. J. Patterson; L. W. Fredrick; W. J. Spiesman; E. Nelan; R. L. Duncombe; P. D. Hemenway; W. H. Jefferys; P. J. Shelus; O. G. Franz; L. H. Wasserman

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TV Columbae (TV Col) is a 13th magnitude Intermediate Polar (IP) Cataclysmic Variable (CV), with multiple periods found in the light curves. Past estimates predicted a distance of 400 parsec to greater than 500 parsec. Recently completed Hubble Space Telescope (HST) Fine Guidance Sensor (FGS) interferometric observations allow us to determine the first trigonometric parallax to TV Col. This determination puts the distance of TV Col at 368 -15+17 parsecs. CD-32 2376, a 10th magnitude Tycho...

Source: http://arxiv.org/abs/astro-ph/0107026v1