Extending complex Langevin simulations to full QCD at nonzero density

Abstract

Simulations of full QCD at nonzero baryon density using light quark masses are presented. The sign problem is evaded by the usage of the complex Langevin equation. The simulations are stabilized by the gauge cooling procedure for small lattice spacings. The method allows simulations at high densities, up to the saturation. The sign average is measured in the full as well as the phasequenched theory. Results are compared to the HQCD approach, in which the spatial hopping terms of fermionic variables are dropped, and good agreement is found at large masses.

Comments: 7 pages, 4 figures, Proceedings of the 31st International Symposium on Lattice Field Theory (Lattice 2013), 29 July - 3 August 2013, Mainz, Germany