Modified gravity inside astrophysical bodies

Ryo Saito, Daisuke Yamauchi, Shuntaro Mizuno, Jérôme Gleyzes, David Langlois

Research output: Contribution to journalArticle

58 Citations (Scopus)

Abstract

Many theories of modified gravity, including the well studied Horndeski models, are characterized by a screening mechanism that ensures that standard gravity is recovered near astrophysical bodies. In a recently introduced class of gravitational theories that goes beyond Horndeski, it has been found that new derivative interactions lead to a partial breaking of the Vainshtein screening mechanism inside any gravitational source, although not outside. We study the impact of this new type of deviation from standard gravity on the density profile of a spherically symmetric matter distribution, in the nonrelativistic limit. For simplicity, we consider a polytropic equation of state and derive the modifications to the standard Lane-Emden equations. We also show the existence of a universal upper bound on the amplitude of this type of modified gravity, independently of the details of the equation of state.

Original languageEnglish
Article number008
JournalJournal of Cosmology and Astroparticle Physics
Volume2015
Issue number6
DOIs
Publication statusPublished - 2015 Jun 1

Keywords

  • dark energy theory
  • modified gravity
  • stars

ASJC Scopus subject areas

  • Astronomy and Astrophysics

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    Saito, R., Yamauchi, D., Mizuno, S., Gleyzes, J., & Langlois, D. (2015). Modified gravity inside astrophysical bodies. Journal of Cosmology and Astroparticle Physics, 2015(6), [008]. https://doi.org/10.1088/1475-7516/2015/06/008