Perfect Actions with Chemical Potential
arXiv:hep-lat/9801022 · doi:10.1016/S0370-2693(98)00269-X
Abstract
We show how to include a chemical potential μin perfect lattice actions. It turns out that the standard procedure of multiplying the quark fields Ψ, \barΨat Euclidean time t by \exp(\pm μt), respectively, is perfect. As an example, the case of free fermions with chemical potential is worked out explicitly. Even after truncation, cut-off effects in the pressure and the baryon density are small. Using a (quasi-)perfect action, numerical QCD simulations for non-zero chemical potential become more powerful, because coarse lattices are sufficient for extracting continuum physics.
10 pages, LaTex, 3 figures