Thin accretion disks around a black hole in Einstein-Aether-scalar theory

TL;DR

This paper investigates how a modified gravity theory, Einstein-Aether-Scalar, influences the physical properties of thin accretion disks around supermassive black holes, revealing parameter-dependent variations in disk temperature, luminosity, and efficiency.

Contribution

It introduces the effects of Einstein-Aether-Scalar theory parameters on accretion disk properties, highlighting differences from general relativity.

Findings

Energy flux decreases with increasing parameter

Disk temperature and luminosity vary with parameter sign

Certain parameter values are physically inconsistent

Abstract

We consider the accretion process in the thin disk around a supermassive black hole in Einstein-aether-scalar theory. We probe the effects of the model parameter on the physical properties of the disk. The results show that with increasing value of the parameter, the energy flux, the radiation temperature, the spectra cut-off frequency, the spectra luminosity, and the conversion efficiency of the disk decrease. The disk is hotter and more luminous than that in general relativity for negative parameter, while it is cooler and less luminous for positive parameter. We also find some values of the parameter allowed by the theory are excluded by the physical properties of the disk.