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Modified gravity at astrophysical scales

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Cermeño, M. and Carro, J. and López Maroto, Antonio and Pérez García, M. A. (2019) Modified gravity at astrophysical scales. Astrophysical journal, 872 (2). ISSN 0004-637X

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Official URL: http://dx.doi.org/10.3847/1538-4357/ab001c


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https://iopscience.iop.orgPublisher


Abstract

Using a perturbative approach we solve stellar structure equations for low-density (solar-type) stars whose interior is described with a polytropic equation of state in scenarios involving a subset of modified gravity (MG) theories. Rather than focusing on particular theories, we consider a model-independent approach in which deviations from General Relativity are effectively described by a single parameter xi. We find that for length scales below those set by stellar General Relativistic radii the modifications introduced by MG can affect the computed values of masses and radii. As a consequence, the stellar luminosity is also affected. We discuss possible further implications for higher-density stars and observability of the effects previously described.


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© 2019 IOP
We thank M. Fairbairn for useful comments. This work has been supported by Junta de Castilla y Leon SA083P17, Spanish MINECO grant FIS2016-78859-P(AEI/FEDER, UE), and by PHAROS Cost action. We also thank the support of the Spanish Red Consolider MultiDark FPA2017-90566-REDC. M.C. is supported by a fellowship from the University of Salamanca.

Uncontrolled Keywords:Cosmological parameters; Gravitation; Stars: General
Subjects:Sciences > Physics
ID Code:55014
Deposited On:12 Apr 2019 14:56
Last Modified:23 Apr 2019 16:26

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