Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 6, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2015/06/008
Keywords
modified gravity; stars dark energy theory
Funding
- JSPS Postdoctoral Fellowships for Research Abroad
- JSPS [26887042]
- Waseda University Grant [2014S-191]
- [259800]
- Grants-in-Aid for Scientific Research [13J09800, 26887042] Funding Source: KAKEN
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Many theories of modified gravity, including the well studied Etorndeski 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.
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