论文标题
核物质在有限温度和原始恒星的静态特性下
Nuclear matter at finite temperature and static properties of proto-neutron star
论文作者
论文摘要
使用有效的手性模型，在不同温度下研究了核物质的有限温度特性。对于对称核物质，我特别关注在低温和密度下液态气相变的可能性。在这种情况下获得的临界温度与实验和经验发现一致。还研究了不同温度值的自由能和熵变化。还检查了一些不对称的核物质特性，例如状态方程和相对于温度的声音速度。还扩展了这项工作，以在有限温度下获得$β$稳定核物质状态的方程。对于无中微子的情况，计算了各种静态原始恒星的特性，以广泛的温度范围，与原始恒星有关。对于所有温度值，发现获得的最大重力质量的估计值与从PSR J0348+0432和PSR J0740+6620等巨大脉冲液中指定的观测约束非常吻合。所有温度的表面红移结果还满足了EXO 07482-676，1E 1207.4-5209和RX J0720.4-3125的最大表面红移约束。
With the effective chiral model, the finite temperature properties of nuclear matter have been studied at different temperatures. For symmetric nuclear matter, I particularly focused on the possibility of liquid-gas phase transition at low temperature and density. The critical temperature obtained in this context, is consistent with the experimental and empirical findings. The free energy and entropy variations are also studied for different values of temperature. A few asymmetric nuclear matter properties like the equation of state and the speed of sound with respect to temperature are also examined. The work is also extended to obtain the equation of state of $β$ stable nuclear matter at finite temperature. For the neutrino free case, the various static proto-neutron star properties are computed for a wide range of temperature, relevant to proto-neutron stars. For all the values of temperature, the obtained estimates of maximum gravitational mass are found to be in good agreement with the observational constraints specified from massive pulsars like PSR J0348+0432 and PSR J0740+6620. The results of surface redshift for all the temperature also satisfy the maximum surface redshift constraints from EXO 07482-676, 1E 1207.4-5209 and RX J0720.4-3125.
