ar X iv : c on d - m at / 9 50 81 42 v 1 3 1 A ug 1 99 5 Dual description of the superconducting phase transition

ar X iv : c on d - m at / 9 50 80 44 v 1 1 1 A ug 1 99 5 Magnetism of superconducting UPt 3

ar X iv : c on d - m at / 9 60 81 38 v 1 2 8 A ug 1 99 6 Ground State Phases of the Doped 4 - Leg t - J Ladder Steven

Using density matrix renormalization group techniques, we have studied the ground state of the 4-leg t-J ladder doped near half-filling. Depending upon J/t and the hole doping x, three types of ground state phases are found: (1) a phase containing d x 2 −y 2 pairs; (2) a striped CDW domain-wall phase, and (3) a phase separated regime. A CDW domain-wall consists of fluctuating hole pairs and thi...

ar X iv : c on d - m at / 9 50 10 33 v 1 9 J an 1 99 5 LAYERED XY - MODELS , ANYON SUPERCONDUCTORS , AND SPIN - LIQUIDS

The partition function of the double-layer XY model in the (dual) Villain form is computed exactly in the limit of weak coupling between layers. Both layers are found to be locked together through the Berezinskii-Kosterlitz-Thouless transition, while they become decoupled well inside the normal phase. These results are recovered in the general case of a finite number of such layers. When re-int...

ar X iv : c on d - m at / 9 50 71 34 v 1 3 1 Ju l 1 99 5 Variational approach to the dilute Bose gas

We study the weakly-interacting Bose gas in both two and three dimensions using a variational approach. In particular we construct the thermodynamic potential of the gas to within ladder approximation and find by minimization an accurate mean-field description of the dilute Bose gas. Using spin-polarized atomic hydrogen as a specific example, we obtain an improved description of the Bose-Einste...

ar X iv : h ep - l at / 9 60 81 30 v 1 2 3 A ug 1 99 6 1 Pomerons and Lattices : a Progress Report

We report on some attempts to use lattice QCD to investigate topics in strong interaction phenomenology which are usually interpreted in terms of soft Pomeron exchange.