de Forcrand Ph, Langelage J, Philipsen O, Unger W
Institut für Theoretische Physik, ETH Zürich, CH-8093 Zürich, Switzerland and CERN, Physics Department, TH Unit, CH-1211 Geneva 23, Switzerland.
Institut für Theoretische Physik, ETH Zürich, CH-8093 Zürich, Switzerland.
Phys Rev Lett. 2014 Oct 10;113(15):152002. doi: 10.1103/PhysRevLett.113.152002. Epub 2014 Oct 6.
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.
我们研究具有四种交错夸克味的格点量子色动力学。在无限规范耦合的极限下，可以引入“对偶”变量，这使得有限密度下的符号问题得到缓解，并允许通过蒙特卡罗模拟完全确定μ-T相图，即使在手征极限下也是如此。然而，连续极限与弱耦合极限一致。我们提出一种朝着连续极限的强耦合展开方法。我们展示了从这个展开式在次领头阶截断得到的初步结果，包括相图及其手征临界点。
