ar X iv : c on d - m at / 9 60 90 73 v 1 7 S ep 1 99 6 Determination of Exchange Parameters for CaV 4 O

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

ar X iv : c on d - m at / 9 60 90 54 v 1 5 S ep 1 99 6 Cumulant Expansions and the Spin - Boson Problem ∗

The dynamics of the dissipative two-level system at zero temperature is studied using three different cumulant expansion techniques. The relative merits and drawbacks of each technique are discussed. It is found that a new technique, the non-crossing cumulant expansion, appears to embody the virtues of the more standard cumulant methods. PACS-number(s): 05.30.-d, 05.40.+j, 72.15.Qm submitted to...

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.

ar X iv : h ep - l at / 9 90 90 36 v 1 7 S ep 1 99 9 1 Flavour - singlet pseudoscalar and scalar mesons

We measure correlations appropriate for favour-singlet mesons using dynamical quark configurations from UKQCD. Improved methods of evaluating the disconnected quark diagrams are presented. The scalar and pseu-doscalar meson channels are explored, with special reference to the mixing of scalar mesons with scalar glueballs.

ar X iv : h ep - l at / 9 60 90 13 v 1 3 S ep 1 99 6 1

We present an exact local bosonic algorithm for the simulation of dynamical fermions in lattice QCD. We show that this algorithm is a viable alternative to the Hybrid Monte Carlo algorithm.