Quantum Monte Carlo treatment of elastic exciton-exciton scatteringWe calculate cross sections for low energy elastic exciton-exciton scattering within the effective mass approximation. Unlike previous theoretical approaches, we give a complete, non-perturbative…J. Shumway, D. M. Ceperley·Jul 20, 1999SaveLearn
An Empirical Investigation of the Forward Interest Rate Term StructureIn this paper we study empirically the Forward Rate Curve (FRC) of 5 different currencies. We confirm and extend the findings of our previous investigation of the U.S. Forward Rate Curve. In…Andrew Matacz, Jean-Philippe Bouchaud·Jul 20, 1999SaveLearn
Knot Theory and the Problem of Classification for Plastic StateIn this paper we constructed new model of plastic deformation. The knot theory was used to classify the plastic state.Trinh Van Khoa·Jul 20, 1999SaveLearn
Phase-diagram and quasiparticles of a lattice SU(2) scalar-fermion model in (2+1) dimensionsThe phase diagram at zero temperature of a lattice SU(2) scalar-fermion model in (2+1) dimensions is studied numerically and with Mean-Field methods. Special attention is devoted to the strong…J. L. Alonso, Ph. Boucaud, V. Martin-Mayor et al.·Jul 20, 1999SaveLearn
Experimental investigation of universal parametric correlators using a vibrating plateThe parametric variation of the eigenfrequencies of a chaotic plate is measured and compared to random matrix theory using recently calculated universal correlation functions. The sensitivity of the…K. Schaadt, A. Kudrolli·Jul 19, 1999SaveLearn
Quantum Theory of Quantum-Hall SmecticsWe propose a quantum stripe (smectic) coupled-Luttinger-liquid model for the anisotropic states which occur in two-dimensional electron systems with high-index partial Landau level filling, $ν* =…A. H. MacDonald, Matthew P. A. Fisher·Jul 19, 1999SaveLearn
Orbital Dependent Exchange-Only Methods for Periodic SystemsVarious orbital-dependent exchange-only potentials are studied which exhibit correct long-range asymptotic behaviour. We present the first application of these potentials for polymers and by one of…P. S"ule, S. Kurth, V. Van Doren·Jul 19, 1999SaveLearn
Log-periodic power law bubbles in Latin-American and Asian markets and correlated anti-bubbles in Western stock markets: An empirical studyTwenty-two significant bubbles followed by large crashes or by severe corrections in the Argentinian, Brazilian, Chilean, Mexican, Peruvian, Venezuelan, Hong-Kong, Indonesian, Korean, Malaysian,…Anders Johansen, Didier Sornette·Jul 19, 1999SaveLearn
Ground-State Properties of a Rotating Bose-Einstein Condensate with Attractive InteractionThe ground state of a rotating Bose-Einstein condensate with attractive interaction in a quasi-one-dimensional torus is studied in terms of the ratio γ of the mean-field interaction energy per…Masahito Ueda, Anthony J. Leggett·Jul 16, 1999SaveLearn
Radiation from an electron bunch flying over a surface waveRadiation generated by the passage of a monoenergetic electron bunch above the surface wave excited in plane interface between homogeneous media with different dielectric constants is investigated.…A. A. Saharian, A. R. Mkrtchyan, L. A. Gevorgian et al.·Jul 16, 1999SaveLearn
Cluster Statistics of BTW AutomataThe cluster statistics of BTW automata in the SOC states are obtained by extensive computer simulation. Various moments of the clusters are calculated and few results are compared with earlier…Ajanta Bhowal Acharyya·Jul 16, 1999SaveLearn
Cavity atom optics and the `free atom laser'The trap environment in which Bose-Einstein condensates are generated and/or stored strongly influences the way they interact with light. The situation is analogous to cavity QED in quantum optics,…J. Heurich, M. G. Moore, P. Meystre·Jul 15, 1999SaveLearn
Vortex structures in dilute quantum fluidsVortex structures in dilute quantum fluids are studied using the Gross-Pitaevskii equation. The velocity and momentum of multiply quantized vortex rings are determined and their core structures…T. Winiecki, J. F. McCann, C. S. Adams·Jul 15, 1999SaveLearn
Critical Exponents from Five-Loop Strong-Coupling phi4-Theory in 4- epsilon DimensionsWith the help of strong-coupling theory, we calculate the critical exponents of O(N)-symmetric phi4-theories in 4- epsilon dimensions up to five loops with an accuracy comparable to that achieved by…Hagen Kleinert, Verena Schulte-Frohlinde·Jul 15, 1999SaveLearn
Two Definitions of Superfluid DensityWe point out that two different definitions of the superfluid density - through statistical response to static gauge phase and through dynamic response to altering gauge phase - yield, generally…N. V. Prokof'ev, B. V. Svistunov·Jul 14, 1999SaveLearn
Group Theory Approach to Band Structure: Scarf and Lame HamiltoniansThe group theoretical treatment of bound and scattering state problems is extended to include band structure. We show that one can realize Hamiltonians with periodic potentials as dynamical…Hui Li, Dimitri Kusnezov·Jul 14, 1999SaveLearn
Coherent Magnetic Moment Reversal in Small Particles with Nuclear SpinsA discrete WKB method is developed for calculating tunnel splittings in spin problems. The method is then applied to the issue of how nuclear spins affect the macroscopic quantum coherence of the…Anupam Garg·Jul 13, 1999SaveLearn
Application of the discrete Wentzel-Kramers-Brillouin method to spin tunnelingA discrete version of the WKB method is developed and applied to calculate the tunnel splittings between classically degenerate states of spin Hamiltonians. The results for particular model problems…Anupam Garg·Jul 13, 1999SaveLearn
Ab initio study of the vapour-liquid critical point of a symmetrical binary fluid mixtureA microscopic approach to the investigation of the behaviour of a symmetrical binary fluid mixture in the vicinity of the vapour-liquid critical point is proposed. It is shown that the problem can be…O. V. Patsahan, M. P. Kozlovskii, R. S. Melnyk·Jul 13, 1999SaveLearn
Nonlinear Spin Dynamics in Ferromagnets with Electron-Nuclear CouplingNonlinear spin motion in ferromagnets is considered with nonlinearity due to three factors: (i) the sample is prepared in a strongly nonequilibrium state, so that evolution equations cannot be…V. I. Yukalov, M. G. Cottam, M. R. Singh·Jul 13, 1999SaveLearn
Scaling invariance in finance II: Path-dependent contingent claimsThis article is the second one in a series on the use of scaling invariance in finance. In the first article (cond-mat/9906048), we introduced a new formalism for the pricing of derivative…Jiri Hoogland, Dimitri Neumann·Jul 13, 1999SaveLearn
Phase separation and enhanced charge-spin coupling near magnetic transitionsThe generic changes of the electronic compressibility in systems which show magnetic instabilities is studied. It is shown that, when going into the ordered phase, the compressibility is reduced by…F. Guinea, G. Gomez-Santos, D. Arovas·Jul 13, 1999SaveLearn
Theory of the pi state in 3He Josephson junctionsThe flow of superfluid 3He-B through a 65 x 65 array of nanometer size apertures has been measured recently by Backhaus et al. They find in the current--phase relation a new branch, so-called pi…J. K. Viljas, E. V. Thuneberg·Jul 13, 1999SaveLearn
Nesting properties and anisotropy of the Fermi surface of LuNi2B2CThe rare earth nickel borocarbides, with the generic formula RNi2B2C, have recently been shown to display a rich variety of phenomena. Most striking has been the competition between, and…S. B. Dugdale, M. A. Alam, I. Wilkinson et al.·Jul 13, 1999SaveLearn
Heat transport and self-organized criticality in liquid 4He close to TlambdaWe present a renormalization-group calculation based on model F for the thermal conductivity lambdaT(T,Q) in the presence of a homogeneous heat current Q and gravity. For temperatures below Tlambda…Rudolf Haussmann·Jul 12, 1999SaveLearn