Astrophysical black holes in screened modified gravity
arXiv:1402.4737 · doi:10.1088/1475-7516/2014/08/033
Abstract
Chameleon, environmentally dependent dilaton, and symmetron gravity are three models of modified gravity in which the effects of the additional scalar degree of freedom are screened in dense environments. They have been extensively studied in laboratory, cosmological, and astrophysical contexts. In this paper, we present a preliminary investigation into whether additional constraints can be provided by studying these scalar fields around black holes. By looking at the properties of a static, spherically symmetric black hole, we find that the presence of a non-uniform matter distribution induces a non-constant scalar profile in chameleon and dilaton, but not necessarily symmetron gravity. An order of magnitude estimate shows that the effects of these profiles on in-falling test particles will be sub-leading compared to gravitational waves and hence observationally challenging to detect.
31 pages, 10 figures, published version
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- Gravitational Effects of Disformal Couplings
- Evolving Black Holes in Inflation
- Black hole accretion discs and screened scalar hair
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- Gravitational couplings in Chameleon models
- Unscreening scalarons with a black hole
- Superradiant instabilities by accretion disks in scalar-tensor theories
- Chameleon Field in a Spherical Shell System
- Anti-screening of the Galileon force around a disk center hole
- Extremal cosmological black holes in Horndeski gravity and the anti-evaporation regime
- Quintessence-Chameleon transitions in anisotropic Kiselev model of neutron stars