Chemical Potential ∗
نویسنده
چکیده
We show how to include a chemical potential µ in perfect lattice actions. It turns out that the standard procedure of multiplying the quark fields Ψ, ¯ Ψ at Euclidean time t by exp(±µt), respectively, is perfect. As an example, the case of free fermions with chemical potential is worked out explicitly. Even after truncation, cutoff 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.
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