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arXiv 1801.03387gr-qc
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Starobinsky模型中的暗星

Dark stars in Starobinsky's model

Grigoris Panotopoulos, Ilidio Lopes

摘要:

本文在$f(R)$修正的引力理论中研究了非旋转暗星。特别是,我们已经考虑了玻色子自相互作用暗物质模拟内部的恒星作为玻色-爱因斯坦凝聚体,而至于修改后的引力理论,我们已经假定Starobinsky的模型$R+aR^2$。数值求解广义结构方程,得到了几种不同参数$a$值和两种不同暗物质状态方程下的质量比关系。结果表明,与广义相对论相比,在R平方引力下,暗物质星变得更加致密,而在修正引力理论下,暗物质星的最大质量略有增加.每种情况下的最高恒星质量的数值已经报告。

英文摘要:

In the present work we study non-rotating dark stars in $f(R)$ modified theory of gravity. In particular, we have considered bosonic self-interacting dark matter modelled inside the star as a Bose-Einstein condensate, while as far as the modified theory of gravity is concerned we have assumed Starobinsky's model $R+aR^2$. We solve the generalized structure equations numerically, and we obtain the mass-to-ratio relation for several different values of the parameter $a$, and for two different dark matter equation-of-states. Our results show that the dark matter stars become more compact in the R-squared gravity compared to General Relativity, while at the same time the highest star mass is slightly increased in the modified gravitational theory. The numerical value of the highest star mass for each case has been reported.

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