Lattice QCD phase diagram in and away from the strong coupling limit.
We study lattice QCD with four flavors of staggered quarks. In the limit of infinite gauge coupling, "dual" variables can be introduced, which render the finite-density sign problem mild and allow a full determination of the μ-T phase diagram by Monte Carlo simulations, also in the chiral limit. However, the continuum limit coincides with the weak coupling limit. We propose a strong-coupling expansion approach towards the continuum limit. We show first results, including the phase diagram and its chiral critical point, from this expansion truncated at next-to-leading order.
Institut für Theoretische Physik, ETH Zürich, CH-8093 Zürich, Switzerland and CERN, Physics Department, TH Unit, CH-1211 Geneva 23, Switzerland.
Ph
P
de Forcrand
Institut für Theoretische Physik, ETH Zürich, CH-8093 Zürich, Switzerland.
J
J
Langelage
Institut für Theoretische Physik, Goethe-Universität Frankfurt, 60438 Frankfurt am Main, Germany.
O
O
Philipsen
Institut für Theoretische Physik, Goethe-Universität Frankfurt, 60438 Frankfurt am Main, Germany.
W
W
Unger