Multicanonical cluster algorithm and the 2-D seven state Potts model

Sep, 1992
17 pages
Published in:
  • Nucl.Phys.B 390 (1993) 621-636
e-Print:
Report number:
  • CERN-TH-6654-92

Citations per year

1993199619992002200502468
Abstract:
I present a hybrid-like two-step algorithm, which combines a microcanonical update of a spin system using demons, with a multicanonical demon refresh. The algorithm is free from the supercritical slowing down that burdens the canonical methods: the exponential increase of the tunnelling time between the metastable states in the first-order phase transitions, when the volume of the system is increased. The demons act as a buffer between the multicanonical heat bath and the spin system, allowing the spin system to be updated with any microcanonical demon procedure, including cluster methods. The cluster algorithm is demonstrated with the 2-dimensional 7-state Potts model, using volumes up to 128 2128~2. The tunnelling time is found to increase as L 1.82L~{1.82}, where LL is the linear dimension of the system.