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arXiv 2203.05764gr-qc
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爱因斯坦暗能量模型中的致密星

Compact stars in the Einstein dark energy model

Zahra Haghani, Tiberiu Harko

摘要:

我们调查的高密度紧凑的对象的性质在矢量型理论,灵感来自爱因斯坦的1919年理论的基本粒子,其中爱因斯坦假设,基本粒子举行在一起的引力以及电磁型力。从现代的观点来看,爱因斯坦的理论可以被解释为一个矢量型模型,引力作用量被构造为里奇标量、物质能量-动量张量的迹和一个大质量自相互作用矢量型场的线性组合。为了获得恒星模型的属性,我们考虑的静态,球对称系统的场方程,我们调查他们的解决方案的夸克和中子物质的不同状态方程的数值,通过假设的自相互作用势的矢量场要么消失,或者是二次的矢量场势。我们考虑夸克星描述的麻省理工学院袋模型状态方程和色味锁定阶段,以及紧凑的恒星组成的玻色-爱因斯坦凝聚体的中子物质,与中子形成库珀对。常密度星,代表了广义相对论的内部史瓦西解的推广,也进行了分析。此外,我们考虑Douchin-Haensel(SLy)状态方程。在标准广义相对论和爱因斯坦暗能量模型中得到了数值解,并对这两种理论的天体物理预测进行了深入的比较。作为我们的研究的一般结论,我们发现,对于所有考虑的状态方程的恒星结构可以得到更大的各种爱因斯坦暗能量模型,包括类的恒星比他们的广义相对论更大的质量。

英文摘要:

We investigate the properties of high density compact objects in a vector type theory, inspired by Einstein's 1919 theory of elementary particles, in which Einstein assumed that elementary particles are held together by gravitational as well as electromagnetic type forces. From a modern perspective, Einstein's theory can be interpreted as a vector type model, with the gravitational action constructed as a linear combination of the Ricci scalar, of the trace of the matter energy-momentum tensor, and of a massive self-interacting vector type field. To obtain the properties of stellar models we consider the field equations for a static, spherically symmetric system, and we investigate numerically their solutions for different equations of state of quark and neutron matter, by assuming that the self-interaction potential of the vector field either vanishes or is quadratic in the vector field potential. We consider quark stars described by the MIT bag model equation of state and in the Color Flavor Locked phase, as well as compact stars consisting of a Bose-Einstein Condensate of neutron matter, with neutrons forming Cooper pairs. Constant density stars, representing a generalization of the Interior Schwarzschild solution of general relativity, are also analyzed. Also, we consider the Douchin-Haensel (SLy) equation of state. The numerical solutions are explicitly obtained in both standard general relativity, and the Einstein dark energy model and an in depth comparison between the astrophysical predictions of these two theories are performed. As a general conclusion of our study, we find that for all the considered equations of state a much larger variety of stellar structures can be obtained in the Einstein dark energy model, including classes of stars that are more massive than their general relativistic counterparts.

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