2018/11/30 by M. Cermeño, J. Carro, A. L. Maroto +2 · 6 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #Cosmology and Gravitation Theories #Equation of state #General relativity #Luminosity #Observability #Polytrope #Polytropic process #Stars #Stellar structure #Stellar, planetary, and galactic studies #Theory of relativity #astro-ph.CO #astro-ph.SR #gr-qc
paper · pdf · doi:10.3847/1538-4357/ab001c
published in The Astrophysical Journal 872(2), 130 (IOP Publishing) · 12 pages, 7figures, matches published version
openalex created_date 2018/12/11 · openalex publication_date 2019/02/19 · arxiv created 2019/02/25 · arxiv updated 2019/02/27 · openalex updated_date 2026/08/05
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 ξ . 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.