Chiral Phase Transition at Finite Isospin Density in Linear Sigma Model
Using the linear sigma model, we have introduced the pion isospin chemical potential. The chiral phase transition is studied at finite temperatures and finite isospin densities. We have studied the μ - T phase diagram for the chiral phase transition and found the transition cannot happen below a certain low temperature because of the BoseEinstein condensation in this system. Above that temperature, the chiral phase transition is studied by the isotherms of pressure versus density. We indicate that the transition, in the chiral limit, is a first-order transition from a low-density phase to a high-density phase like a gas-liquid phase transition.
作 者： Shu Song LI Jia-Rong 作者单位： Institute of Particle Physics, Central-China Normal University, Wuhan 430079, China 刊 名： 理论物理通讯（英文版） ISTIC SCI 英文刊名： COMMUNICATIONS IN THEORETICAL PHYSICS 年，卷(期)： 2005 43(3) 分类号： 关键词： finite temperature field theory nuclear matter chiral symmetries