扩展RMF模型中的夸克-强子物质与夸克-强子星
Quarkyonic matter and quarkyonic stars in an extended RMF model
AI总结：
该研究结合RMF模型与含密度依赖夸克质量的等效粒子模型，构建夸克-强子相模型，统一研究核物质、夸克物质和夸克-强子物质性质，发现夸克-强子相变可优化物态方程以满足实验和天体物理约束。
摘要：
通过结合相对论平均场（RMF）模型与含密度依赖夸克质量的等效粒子模型，我们明确构建了“夸克费米海”和“重子费米面”来模拟夸克-强子相，其中包含动量从0到费米动量的重子。我们以统一方式研究了核物质、夸克物质和夸克-强子物质的性质，夸克-强子物质更稳定，能量最小化仍可用于获取致密物质的微观性质。我们采用了三种不同的协变密度泛函TW99、PKDD和DD-ME2：TW99能较好地预测中子星和重离子碰撞中的核物质性质，但不利于夸克-强子相变；而PKDD（对称能斜率L更大）或DD-ME2（偏度系数J更大）的物态方程（EOS）过硬，不符合实验和天体物理约束；夸克-强子相变可使EOS变软，从而满足各类约束。
英文摘要：
By combining RMF models and equivparticle models with density-dependent quark masses, we construct explicitly ``a quark Fermi Sea'' and ``a baryonic Fermi surface'' to model the quarkyonic phase, where baryons with momentums ranging from zero to Fermi momentums are included. The properties of nuclear matter, quark matter, and quarkyonic matter are then investigated in a unified manner, where quarkyonic matter is more stable and energy minimization is still applicable to obtain the microscopic properties of dense matter. Three different covariant density functionals TW99, PKDD, and DD-ME2 are adopted in our work, where TW99 gives satisfactory predictions for the properties of nuclear matter both in neutron stars and heavy-ion collisions and quarkyonic transition is unfavorable. Nevertheless, if PKDD with larger slope of symmetry energy $L$ or DD-ME2 with larger skewness coefficient $J$ are adopted, the corresponding EOSs are too stiff according to both experimental and astrophysical constraints. The situation is improved if quarkyonic transition takes place, where the EOSs become softer and can accommodate various experimental and astrophysical constraints.
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