Thin accretion disk in the Simpson-Visser black-bounce and wormhole spacetimes

TL;DR

This paper compares the optical and electromagnetic properties of thin accretion disks around Simpson-Visser black-bounce and wormhole spacetimes to Schwarzschild black holes, highlighting observable differences influenced by the regularization parameter.

Contribution

It provides a detailed analysis of accretion disk images and electromagnetic signatures in Simpson-Visser spacetimes, revealing how these differ from traditional black holes.

Findings

Accretion disk temperature and luminosity increase with the regularization parameter 'l'

Simpson-Visser accretion disk images resemble Schwarzschild black holes

Electromagnetic signatures can distinguish wormholes from black holes

Abstract

We compare the optical appearance of a thin accretion disk in the Simpson-Visser spacetime to the Schwarzschild black hole case in this paper. We calculate and illustrate the red-shift and observed flux distributions as viewed by distant observers at various inclination angles. Simpson-Visser family of metrics create Novikov-Thorne (NT) accretion disks images that nearly look like a Schwarzschild black hole's NT accretion disk. We have studied also the embedding diagram, the electromagnetic properties of the accretion disk such as the temperature and the radiation flux of the energy by the accretion disk and the accretion efficiency. Compared to the Schwarzschild black hole, we find that the temperature, radiation flux of the energy, and the luminosity of the accretion disk increase by increasing the regularization parameter $'l'$. We conclude that, based on astrophysical observational signatures in the properties of the electromagnetic spectrum, we can distinguish the wormhole geometries from the regular black holes (black-bounce) and the Schwarzschild black hole.