ar X iv : c on d - m at / 9 40 90 02 v 1 1 S ep 1 99 4 Driven Depinning in Anisotropic Media

ar X iv : c on d - m at / 9 40 90 38 v 1 9 S ep 1 99 4 Enhancement of Persistent Currents by the Coulomb Interaction

The persistent current in three-dimensional mesoscopic rings is investigated numerically. The model is tight-binding one with random site-energies and interaction between electrons. The Hartree-Fock approximation is adopted for the interaction between electrons, and models with up to 3 × 4 × 40 sites are investigated. It is shown that the long-range Coulomb interaction enhances the persistent c...

ar X iv : h ep - l at / 9 90 60 02 v 1 1 J un 1 99 9 Exploring the π + – π + Interaction in Lattice QCD

ar X iv : c on d - m at / 9 90 90 44 v 1 3 S ep 1 99 9 Systematic low temperature expansion in Ginzburg - Landau model

Consistent perturbation theory for thermodynamical quantities in strongly type II superconductors in magnetic field at low temperatures is developed. It is complementary to the existing expansion valid at high temperatures. Magnetization and specific heat are calculated to two loop order and compare well with existing Monte Carlo simulations, other theories and experiments. Typeset using REVTEX 1

ar X iv : c on d - m at / 9 60 31 20 v 1 1 6 M ar 1 99 6 Transport in Sand Piles , Interface Depinning , and Earthquake Models

Recent numerical results for a model describing dispersive transport in rice piles are explained by mapping the model to the depinning transition of an interface that is dragged at one end through a random medium. The average velocity of transport vanishes with system size L as < v >∼ L2−D ∼ L−0.23, and the avalanche size distribution exponent τ = 2 − 1/D ≃ 1.55, where D ≃ 2.23 from interface d...

ar X iv : c on d - m at / 9 60 31 90 v 1 2 9 M ar 1 99 6 The Four - Dimensional XY Spin Glass