Talk presented by Uwe-Jens Wiese

Parallel Session: Finite Temperature and Density II

Thursday July 1st, 18.00 - 18.20, Room 7

D-Theory Formulation and Meron-Cluster Simulation of Field Theories at non-zero Chemical Potential

Abstract: In the D-theory formulation of field theory continuous classical fields arise from the dimensional reduction of discrete quantum spin and quantum link variables. When a chemical potential is introduced in this formulation the resulting Boltzmann factor is real but may be positive or negative depending on the basis chosen for the discrete variables. Even when a basis with only positive weights exists, it is advantageous to allow negative weights and solve the resulting sign problem with a meron-cluster algorithm. This allows very efficient simulations of the 2-d O(3) model (and possibly of QCD) with non-zero chemical potential.

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