Unscreening scalarons with a black hole
arXiv:1704.04114 · doi:10.1103/PhysRevD.95.104041
Abstract
It is typically believed that the additional degrees of freedom in any modification of gravity are completely suppressed by the large energy densities coexisting with an astrophysical black hole. In this paper, we find that this might not always be the case. This belief holds for black holes formed via gravitational collapse in very dense environments, whereas the black holes with sufficiently low accretion rates that have low matter densities inside innermost stable circular orbit will generally unscreen chameleons. We develop a novel technique to study the dynamics of accretion of a scalar field onto a Schwarzschild-like black hole which is accurate on both short and long time scales. In particular, we study the behavior of the extra scalar degree of freedom in the Starobinsky and Hu-Sawicki theories, for the symmetron model, and for the Ratra-Peebles model. Aside from calculating non-trivial static field profiles outside the black hole, we provide the tools to study the (in)stability and evolution towards the equilibrium solution for any generic well behaved set of parameters and initial conditions. Our code is made publicly available for further research and modifications to study other models.
REVTeX 4.1; 18 pages, 24 figures. Minor corrections and references added
References in corpus (10)
- The Confrontation between General Relativity and Experiment
- Models of f(R) Cosmic Acceleration that Evade Solar-System Tests
- Disappearing cosmological constant in f(R) gravity
- Metric-affine f(R) theories of gravity
- f(R) Gravity and Chameleon Theories
- A Singularity Problem with f(R) Dark Energy
- Notes on Perfectly Matched Layers (PMLs)
- Can higher curvature corrections cure the singularity problem in f(R) gravity?
- Masses and Accretion Rates of Supermassive Black Holes in Active Galactic Nuclei from the INTEGRAL Survey
- Black hole accretion discs and screened scalar hair