Modified Gravity at Astrophysical Scales

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-in...

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Bibliographic Details
Published in:The Astrophysical journal 2019-02, Vol.872 (2), p.130
Main Authors: Cermeño, M., Carro, J., Maroto, A. L., Pérez-García, M. A.
Format: Article
Language:English
Subjects:
Astrophysics
cosmological parameters
Density
Equations of state
Gravitation
Luminosity
Relativity
stars: general
Stellar luminosity
Stellar structure
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Summary: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 . 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.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/ab001c