QCD在零密度和有限密度下的晶格热力学从头算研究

Ab initio nuclear thermodynamics

We propose a new Monte Carlo method called the pinhole trace algorithm for {\it ab initio} calculations of the thermodynamics of nuclear systems. For typical simulations of interest, the computational speedup relative to conventional grand-canonical ensemble calculations can be as large as a factor of one thousand. Using a leading-order effective interaction that reproduces the properties of many atomic nuclei and neutron matter to a few percent accuracy, we determine the location of the critical point and the liquid-vapor coexistence line for symmetric nuclear matter with equal numbers of pro…

Ab initio nuclear thermodynamics from lattice effective field theory

We show that the {\it ab initio} calculations of nuclear thermodynamics can be performed efficiently using lattice effective field theory. The simulations use a new approach called the pinhole trace algorithm to calculate thermodynamic observables for a fixed number of protons and neutrons enclosed in a finite box. In this framework, we calculate the equation of state, the liquid-vapor coexistence line and the critical point of neutral symmetric nuclear matter with high precision. Since the algorithm uses a canonical ensemble with a fixed number of particles, it provides a sizable computationa…

改进Wilson夸克在零密度和有限密度下的QCD热力学

QCD thermodynamics at zero and finite densities with improved Wilson quarks

WHOT-QCD协作组正在利用改进的Wilson夸克推进有限温度和密度下QCD的晶格研究。我们首先采用传统的固定Nt方法给出了零密度和有限密度下两种味简并夸克（N_F=2）的QCD结果。然后我们报告了采用我们发展的T积分方法的固定尺度方法对N_F=2+1 QCD的研究情况。

U（1）标量场理论中宇宙弦密度的热力学

The Thermodynamics of Cosmic String densities in U(1) Scalar Field Theory

本文给出了U（1）标量场理论中相变的完整表征和三维涡弦热力学。我们表明，相变的字符串密度存在，并测量其临界指数，无论是长字符串和短循环。这两个字符串人口之间的自然分离的证据。特别是，我们的结果强烈表明，一个无限的字符串人口将只存在以上的临界温度。宇宙弦演化的正则初始条件对应于理论的无限温度极限。

低密度下手征对称性的热力学

Thermodynamics of chiral symmetry at low densities

考虑了双色QCD相图随温度和重子化学势的变化。利用基于微观理论对称性的低能手征拉格朗日量，我们在单圈水平上确定了双夸克凝聚的临界化学势与温度的关系，以及双夸克凝聚和重子密度与温度的关系.的临界化学势的温度依赖性的预测是一致的稀玻色气体得到的。相关联的相变示出为第二顺序为低温和第一顺序在较高的温度。确定了二级相变结束的三临界点。这些结果被推广到夸克在伴随表象下的QCD和在非零化学势下的普通QCD。