Accretion disk luminosity for black holes surrounded by dark matter with anisotropic pressure

TL;DR

This paper studies how dark matter with anisotropic pressure influences the properties and luminosity of accretion disks around static black holes, revealing significant effects on disk radiation and geometry.

Contribution

It introduces a detailed analysis of accretion disk parameters considering anisotropic dark matter, highlighting its impact on observable luminosity features.

Findings

Dark matter anisotropy alters accretion disk geometry.

Presence of dark matter affects radiative flux and luminosity.

Orbital parameters depend on dark matter density and pressure anisotropy.

Abstract

We investigate the luminosity of the accretion disk for a static black hole surrounded by dark matter with anisotropic pressure. We calculate all basic orbital parameters of test particles in the accretion disk, such as angular velocity, angular momentum, energy and radius of the innermost circular stable orbit as functions of the dark matter density, radial pressure and anisotropic parameter, which establishes the relationship between the radial and tangential pressures. We show that the presence of dark matter with anisotropic pressure makes a noticeable difference in the geometry around a Schwarzschild black hole, affecting the radiative flux, differential luminosity and spectral luminosity of the accretion disk.