Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
1996-12-15
Nucl.Phys.Proc.Suppl. 63 (1998) 436-438
Physics
High Energy Physics
High Energy Physics - Lattice
contains .tex file of text and three figures as .epsi files
Scientific paper
10.1016/S0920-5632(97)00794-9
We present a method of simulating lattice QCD at nonzero chemical potential in the chiral limit. By adding a weak four-fermi interaction to the standard staggered fermion SU(3) QCD action, we produce an algorithm in which the limit of massless fermions is well-behaved and physical. Using configurations at zero chemical potential, and an exact fugacity expansion of the fermion determinant, we can simulate QCD at nonzero chemical potential and evade the notorious problem of the complex action. Small lattice simulations give physical results: At strong gauge coupling the critical chemical potential \mu_c agrees with theoretical expectations and at weak gauge coupling \mu_c is nonzero in the low temperature confined phase of QCD and jumps to zero in the high temperature quark-gluon plasma phase. In all these simulations the quarks are exactly massless and there is a Goldstone pion.
Barbour I. M.
Kogut John B.
Morrison Susan E.
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