Finite density fat QCD - art. no. 111501

Lattice formulation of finite baryon density QCD is problematic from the co mputer simulation paint of view; it is well known that for light quark mass es the reconstructed partition function fails to be positive in a wide regi on of parameter space. For a large bare quark mass, problems related to the phase of the determinant are still present but restricted to a small regio n in the chemical potential mu. We present evidence for a transition line t hat, starting from the temperature critical point at mu = 0, moves towards a smaller beta with increasing mu.