Black hole accretion in scalar-tensor-vector gravity

Abstract

We examine the accretion of matter onto a black hole in scalar--tensor--vector gravity (STVG) also known as modified gravity (MOG). The gravitational constant is $G=G_N(1+\alpha )$ where $\alpha$ is a parameter taken to be constant for static black holes in the theory. The MOG black hole is spherically symmetric and characterised by two event horizons. The matter falling into the black hole obeys the polytrope equation of state and passes through two critical points before entering the outer horizon. We obtain analytical expressions for the mass accretion rate as well as for the outer critical point, critical velocity and critical sound speed. Our results complement existing strong field tests like lensing and orbital motion and could be used in conjunction to determine observational constraints on MOG.

6 pages, 1 figure, changed to match published version

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Cited by in corpus (9)

• Superradiance in Modified Gravity (MOG)
• Spherical Accretion of Matter by Charged Black Holes on f(T) Gravity
• Accretion onto a static spherically symmetric regular MOG dark compact object
• New Non-Abelian Reissner-Nordström Black Hole Solutions in the Generalized SU(2) Proca Theory And Some Astrophysical Implications
• Black Holes with Abelian and Non-Abelian Charges and Their Impact on Matter Accretion Flows
• Bondi Accretion in the Spherically Symmetric Johannsen-Psaltis Spacetime
• Accretion dynamics in black holes with spontaneous Lorentz symmetry breaking
• Accretion Process as a Probe of Extra Dimensions in MOG Compact Object Spacetimes
• Regular Rotating MOG Dark Compact Object