标题： 广义混合度规-巴拉蒂尼引力中的夸克星 显示英文标题

标题： Quark stars in generalized hybrid metric-Palatini gravity

摘要： 我们研究了在广义混合度规-Palatini引力理论中两种不同状态方程的夸克星的物理性质。 该理论对应于一种双标量引力理论，其中存在两个非最小耦合的标量场。 通过相对于动态场变分作用量，推导出度规张量和标量场的场方程。 我们得到了致密天体内部静态球对称几何的场方程。 研究了两种类型的夸克星，即MIT袋模型和CFL模型的数值解。 这些解揭示了致密天体的结构。 对于模型参数的不同值获得了解。 所有考虑的情况都表明，致密天体的质量比广义相对论对应的天体更大。 还获得了表面红移和紧凑性，这表明广义混合度规-Palatini夸克星的表面红移更高且更紧凑。 显示英文摘要

摘要： We investigate the physical properties of quark stars with two different equations of state in generalized hybrid metric-Palatini gravity. This theory corresponds to a bi-scalar gravitational theory in which there are two non-minimally-coupled scalar fields. The field equations of the metric tensor and scalar fields are derived by varying the action with respect to the dynamical fields. We obtain the field equations for static spherically symmetric geometry interior of compact objects. The numerical solutions for two types of quark stars, the MIT bag and CFL model are studied. The solutions reveal the structure of the compact objects. The solutions are obtained for different values of the model parameters. All considered cases show that compact objects are more massive than their general relativity counterpart. The surface redshift and compactness are also obtained which shows that the generalized hybrid metric-Palatini quark stars have higher surface redshift and are more compact than general relativity quark stars.