Stellar Structure in a Newtonian Theory with Variable G

被引：2

作者：

Fabris, Julio C. ^{[1
,2
,3
]}

Ottoni, Tulio ^{[4
]}

Toniato, Junior D. ^{[5
]}

Velten, Hermano ^{[5
]}

机构：

[1] Univ Fed Espirito Santo UFES, Nucleo Cosmo Ufes, Ave Fernando Ferrari 540, BR-29075910 Vitoria, ES, Brazil

[2] Univ Fed Espirito Santo UFES, Dept Fis, Ave Fernando Ferrari 540, BR-29075910 Vitoria, ES, Brazil

[3] Natl Res Nucl Univ MEPhI, Kashirskoe Sh 31, Moscow 115409, Russia

[4] Univ Fed Espirito Santo UFES, PPGCosmo, CCE, Ave Fernando Ferrari 540, BR-29075910 Vitoria, ES, Brazil

[5] Univ Fed Ouro Preto UFOP, Dept Fis, Campus Univ Morro Cruzeiro, BR-35400000 Ouro Preto, Brazil

来源：

PHYSICS | 2021年 / 3卷 / 04期

关键词：

alternative Newtonian-like gravity; stellar structure; variable gravitational coupling; PRINCIPLE;

D O I：

10.3390/physics3040071

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A Newtonian-like theory inspired by the Brans-Dicke gravitational Lagrangian has been recently proposed by us. For static configurations, the gravitational coupling acquires an intrinsic spatial dependence within the matter distribution. Therefore, the interior of astrophysical configurations may provide a testable environment for this approach as long as no screening mechanism is evoked. In this work, we focus on the stellar hydrostatic equilibrium structure in such a varying Newtonian gravitational coupling G scenario. A modified Lane-Emden equation is presented and its solutions for various values of the polytropic index are discussed. The role played by the theory parameter omega, the analogue of the Brans-Dicke parameter, in the physical properties of stars is discussed.

引用

页码：1123 / 1132

页数：10

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