δ介子对热前中子星物质的影响

摘要

用相对论平均场理论和MIT口袋模型研究了δ介子对热前中子星内强子-夸克相变的影响.结果表明,加入δ介子后,(1)强子-夸克相变开始的临界密度提前；(2)混合相低密度处的夸克含量变多；(3)中微子丰度变少.δ介子对中微子丰度的影响只在密度适中的区域很明显,而在低密度和高密度区域都很小.温度升高会减弱δ介子作用的强度.口袋常数越大,δ介子作用越强.%In the framework of the relativistic mean field theory and the MIT bag model, the effects of the S meson on thermal protoneutron star matter are studied. After the 8 meson is included, the threshold density for the hadron-quark phase transition becomes lower, the abundance of quarks at low densities in the mixed phase increases and the abundance of neutrinos decrease. The effect of the S meson on the abundance of neutrinos is obvious only in the mediate density range. The increase of the temperature suppresses the 8 meson effects. The increase of the bag constant enhances the 8 meson effects.