Stochastic quantization at finite chemical
and Ion-Olimpiu Stamatescu§
Department of Physics, Swansea University, Swansea, United Kingdom
Institut f¨ur Theoretische Physik, Universit¨at Heidelberg, Heidelberg, Germany
and FEST, Heidelberg, Germany
July 10, 2008
A nonperturbative lattice study of QCD at finite chemical potential is
complicated due to the complex fermion determinant and the sign problem.
Here we apply the method of stochastic quantization and complex Langevin
dynamics to this problem. We present results for U(1) and SU(3) one link
models and QCD at finite chemical potential using the hopping expansion.
The phase of the determinant is studied in detail. Even in the region
where the sign problem is severe, we find excellent agreement between the