Neutron star masses in R2-gravity

被引：15

作者：

Sbisa, Fulvio ^{[1
]}

Baqui, Pedro O. ^{[1
]}

Miranda, Tays ^{[1
,2
]}

Joras, Sergio E. ^{[3
]}

Piattella, Oliver F. ^{[1
,4
]}

机构：

[1] Univ Fed Espirito Santo, Dept Fis, Ave Fernando Ferrari 514, BR-29075910 Vitoria, ES, Brazil

[2] Univ Portsmouth, Inst Cosmol & Gravitat, Dennis Sciama Bldg, Portsmouth PO1 3FX, Hants, England

[3] Univ Fed Rio de Janeiro, Inst Fis, CP 68528, BR-21941972 Rio De Janeiro, RJ, Brazil

[4] Heidelberg Univ, Inst Theoret Phys, Philosophenweg 16, D-69120 Heidelberg, Germany

来源：

PHYSICS OF THE DARK UNIVERSE | 2020年 / 27卷

关键词：

Modified gravity; f(R) gravity; Neutron stars; MODIFIED GRAVITY; EQUATION; MODELS; RADII;

D O I：

10.1016/j.dark.2019.100411

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We address the issue of the existence of inequivalent definitions of gravitational mass in R-2-gravity. We present several definitions of gravitational mass, and discuss the formal relations between them. We then consider the concrete case of a static and spherically symmetric neutron star, and solve numerically the equations of motion for several values of the free parameter of the model. We compare the features of the mass-radius relations obtained for each definition of gravitational mass, and we comment on their dependence on the free parameter. We then argue that R-2-gravity is a valuable proxy to discuss the existence of inequivalent definitions of gravitational mass in a generic modified gravity theory, and present some comments on the general case. (C) 2019 Elsevier B.V. All rights reserved.

引用

页数：12

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