Thin accretion disk signatures in hybrid metric-Palatini gravity

TL;DR

This study investigates the properties of thin accretion disks around black holes in hybrid metric-Palatini gravity, revealing they are colder and less luminous compared to those in general relativity, using numerical modeling of key disk characteristics.

Contribution

It provides the first detailed numerical analysis of accretion disk signatures in hybrid metric-Palatini gravity, comparing results with Schwarzschild black holes.

Findings

Accretion disks are colder in hybrid metric-Palatini gravity.

Disks are less luminous than in general relativity.

Energy conversion efficiency is reduced in the modified gravity model.

Abstract

In the present work, accretion onto a static spherically symmetric black hole in the hybrid metric-Palatini gravity is considered. The Novikov-Thorne model for a relativistic thin accretion disk is used. The energy flux, temperature distribution, emission spectrum and energy conversion efficiency of accretion disks around such black holes are numerically calculated. A comparison with the results for a Schwarzschild black hole is made and conclusions about the viability of the model are drawn. As a result, it is obtained that the accretion disks around black holes in hybrid metric-Palatini gravity are colder and less luminous than in general relativity.