Neutrino pair annihilation above black-hole accretion disks in modified gravity

TL;DR

This paper examines how modified gravity theories influence neutrino pair annihilation near black-hole accretion disks, finding significant enhancements in energy deposition rates compared to General Relativity.

Contribution

It provides the first analysis of neutrino annihilation effects in modified gravity models with idealized accretion disks, showing notable increases in energy deposition.

Findings

Modified gravity enhances neutrino annihilation rates by over an order of magnitude.

Both constant and radial temperature profiles show similar enhancement effects.

Results suggest potential implications for gamma-ray burst models.

Abstract

Using idealized models of the accretion disk, we investigate the effects induced by the modified theories of gravity on the annihilation of the neutrino pair annihilation into electron-positron pairs ($\nu{\bar \nu}\to e^-e^+$), occurring near the rotational axis. For the accretion disk, we have considered the models with temperature $T=constant$ and $T\propto r^{-1}$. In both cases, we find that the modified theories of gravity lead to an enhancement, up to more than one order of magnitude with respect to General Relativity, of the rate of the energy deposition rate of neutrino pair annihilation.