标题： 基于与现代天体物理观测相一致的非局域手征夸克模型的混合状态方程的热双星 显示英文标题

标题： Thermal twin stars within a hybrid equation of state based on a nonlocal chiral quark model compatible with modern astrophysical observations

摘要： 我们研究了最近发展的一种非局域手征夸克模型方法，该方法用于中子星物质状态方程，并将其扩展到有限温度和中微子化学势的情况。我们考虑了两种轻夸克味以及标量-伪标量、矢量和双夸克配对通道中的电流-电流相互作用，在这些通道中，通过一个高斯形式因子来考虑电流的非局域性，该形式因子依赖于四动量的空间分量。在此框架下，我们分析了不同温度和中微子化学势下的有序参数、临界温度、相图、状态方程以及质量-半径关系。对于被近期中子星多信使观测约束的模型参数，我们发现，对于高于30 MeV的温度，等温混合星序列的质量-半径图表现出热孪生现象。 显示英文摘要

摘要： We investigate the extension to finite temperatures and neutrino chemical potentials of a recently developed nonlocal chiral quark model approach to the equation of state of neutron star matter. We consider two light quark flavors and current-current interactions in the scalar-pseudoscalar, vector, and diquark pairing channels, where the nonlocality of the currents is taken into account by a Gaussian form factor that depends on the spatial components of the 4-momentum. Within this framework, we analyze order parameters, critical temperatures, phase diagrams, equations of state, and mass-radius relations for different temperatures and neutrino chemical potentials. For parameters of the model that are constrained by recent multi-messenger observations of neutron stars, we find that the mass-radius diagram for isothermal hybrid star sequences exhibits the thermal twin phenomenon for temperatures above 30 MeV.