Accretion disks around black holes in modified strong gravity

Abstract

Stellar-mass black holes offer what is perhaps the best scenario to test theories of gravity in the strong-field regime. In particular, f(R) theories, which have been widely discuss in a cosmological context, can be constrained through realistic astrophysical models of phenomena around black holes. We aim at building radiative models of thin accretion disks for both Schwarzschild and Kerr black holes in f(R) gravity. We study particle motion in f(R)-Schwarzschild and Kerr space-times. We present the spectral energy distribution of the accretion disk around constant Ricci scalar f(R) black holes, and constrain specific f(R) prescriptions using features of these systems. A precise determination of both the spin and accretion rate onto black holes along with X-ray observations of their thermal spectrum might allow to identify deviations of gravity from General Relativity. We use recent data on the high-mass X-ray binary Cygnus X-1 to restrict the values of the parameters of a class of f(R) models.

16 pages, 20 figures, accepted for publication in Astronomy & Astrophysics

References in corpus (30)

• f(R) Theories Of Gravity
• f(R) theories
• The Confrontation between General Relativity and Experiment
• Curvature Quintessence
• Dark Energy
• A relativistic jet from Cygnus X-1 in the low/hard X-ray state
• The Mass of the Black Hole in Cygnus X-1
• Simultaneous X-ray and gamma-ray observations of Cyg X-1 in the hard state by Ginga and OSSE
• The Extreme Spin of the Black Hole in Cygnus X-1
• Black Holes in f(R) theories
• Thin accretion disks in stationary axisymmetric wormhole spacetimes
• The Trigonometric Parallax of Cygnus X-1
• Neutron Stars in f(R) Gravity with Perturbative Constraints
• Self-Consistent Thermal Accretion Disk Corona Models for Compact Objects: II. Application to Cygnus X-1
• Thin accretion disks in f(R) modified gravity models
• Kerr Black Holes are Not Unique to General Relativity
• Equatorial circular orbits in the Kerr-de Sitter spacetimes
• f(R) Black holes
• Black hole solutions in F(R) gravity with conformal anomaly
• Some exact solutions of F(R) gravity with charged (a)dS black hole interpretation
• Dynamics of thick discs around Schwarzschild-de Sitter black holes
• Thermal Duality and Hagedorn Transition from p-adic Strings
• Stability of f(R) black holes
• Instability of rotating black hole in a limited form of $f(R)$ gravity
• Solutions for f(R) gravity coupled with electromagnetic field
• Static and spherically symmetric black holes in $f(R)$ theories
• Cosmological dynamics of fourth order gravity: A compact view
• Reheating after f(R) inflation
• Stability analysis of f(R)-AdS black holes
• Kerr-Newman black holes in f(R) theories

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