# Accretion disks around black holes in Scalar-Tensor-Vector Gravity

## TL;DR

This paper models thin accretion disks around black holes within Scalar-Tensor-Vector Gravity, revealing they are colder and less luminous than in General Relativity, consistent with observations.

## Contribution

It develops radiative models of accretion disks in STVG for Schwarzschild and Kerr black holes, extending tests of STVG into strong gravity regimes.

## Key findings

- Disks in STVG are colder than in GR.
- Disks in STVG are less luminous than in GR.
- Spectral distributions align with current observations.

## Abstract

Scalar Tensor Vector Gravity (STVG) is an alternative theory of gravitation that has successfully explained the rotation curves of nearby galaxies, the dynamics of galactic clusters, and cosmological data without dark matter, but has hardly been tested in the strong gravity regime. In this work, we aim at building radiative models of thin accretion disks for both Schwarzschild and Kerr black holes in STVG theory. In particular, we study stable circular equatorial orbits around stellar and supermassive black holes in Schwarzschild and Kerr STVG spacetimes. We also calculate the temperature and luminosity distributions of accretion disks around these objects. We find that accretion disks in STVG around stellar and supermassive black holes are colder and less luminous than in GR. The spectral energy distributions obtained do not contradict current astronomical observations.