Revisiting compact star in F(R) gravity: Roles of chameleon potential and energy conditions

被引：8
作者：
Numajiri, Kota [1 ]
Cui, Yong -Xiang [2 ]
Katsuragawa, Taishi [2 ]
Nojiri, Shin'ichi [1 ,3 ]
机构：
[1] Nagoya Univ, Dept Phys, Nagoya 4648602, Japan
[2] Cent China Normal Univ, Inst Astrophys, Wuhan 430079, Peoples R China
[3] Nagoya Univ, Kobayashi Maskawa Inst Origin Particles & Universe, Nagoya 4648602, Japan
来源：
PHYSICAL REVIEW D | 2023年 / 107卷 / 10期
基金：
国家重点研发计划;
关键词：
F R GRAVITY; NEUTRON-STARS; INFLATION; EQUATION; MODELS; MATTER;
D O I：
10.1103/PhysRevD.107.104019
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We reexamine the static and spherical symmetric compact star configuration in the R2 model of the F(R) gravity theory. With asymptotic solutions for the additional scalar degrees of freedom, we refine analysis on the external geometry and settle the scalar-hair problem argued in previous works. Performing the numerical integration of the modified Tolman-Oppenheimer-Volkoff equations as a two-boundaries-value problem, we further discuss the scalar-field distribution inside the compact stars and its influence on the mass-radius relation. We show that the chameleon potential plays an essential role in determining the scalar field inside the star. The scalar field often behaves as a quintessential field that effectively decreases the mass of compact stars with lower central energy density.
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页数：18
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