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 (5)

• Thin accretion disks in stationary axisymmetric wormhole spacetimes
• 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
• Stability of f(R) black holes

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• Circular Orbits Structure and Thin Accretion Disks around Kerr Black Holes with Scalar Hair
• Thin accretion disks and charged rotating dilaton black holes
• Accretion disk around a Schwarzschild black hole in asymptotic safety
• Gravitational wave in f(R) gravity: possible signature of sub- and super-Chandrasekhar limiting mass white dwarfs
• Asymptotically flat vacuum solution in modified theory of Einstein's gravity
• Novel mechanism for vorticity generation in black-hole accretion disks
• Silhouette and spectral line profiles in the special modification of the Kerr black hole geometry generated by quintessential fields
• Thin accretion disk images of the black hole in symmergent gravity
• Particles under radiation thrust in Schwarzschild space-time from a flux perpendicular to the equatorial plane
• ISCOs and OSCOs in the presence of a positive cosmological constant in massive gravity
• Structure of the thin disk in the background of a distorted naked singularity versus a distorted static black hole