Model study of the sign problem in a mean-field approximation

Details Model study of the sign problem in a mean-field approximation Model study of the sign problem in a mean-field approximation

2007-10-16

arxiv.org/abs/0710.3172v1

PoSLAT2007:384,2007

Physics

High Energy Physics

High Energy Physics - Lattice

7 pages, 2 figures, talk presented at the XXV International Symposium on Lattice Field Theory, July 30 - August 4, 2007, Regen

Scientific paper

We study the sign problem of the fermion determinant at nonzero baryon chemical potential. For this purpose we apply a simple model derived from Quantum Chromodynamics, in the limit of large chemical potential and mass. For SU(2) color, there is no sign problem and the mean-field approximation is similar to data from the lattice. For SU(3) color the sign problem is unavoidable, even in a mean-field approximation. We apply a phase-reweighting method, combined with the mean-field approximation, to estimate thermodynamic quantities. We also investigate the mean-field free energy using a saddle-point approximation.

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