Charged black-bounce spacetimes: Photon rings, shadows and observational appearances
Abstract
The photon ring, shadow and observational appearance of the emission originating near a charged black-bounce are investigated. Based on the geodesic analysis, we determine the upper and lower limits of critical impact parameters of a charged black-bounce. In particular, we find that the charged black-bounce shares the same critical impact parameter with the Reissner-Nordst\"om black hole. In addition, we classify the light trajectories coming from the region near the charged black-bounce by utilizing the rays tracing procedure, and then investigate the observational appearance of the emissions from a thin disk accretion and a spherically symmetric infalling accretion. We reveal that a large charge increases the observed intensity but decreases the apparent size of shadows, and that the photon ring presents the intrinsic property of a spacetime geometry, which is independent of the types of the two accretions. Our results are in good agreement with the recent observations.
Keywords
Cite
@article{arxiv.2112.01747,
title = {Charged black-bounce spacetimes: Photon rings, shadows and observational appearances},
author = {Yang Guo and Yan-Gang Miao},
journal= {arXiv preprint arXiv:2112.01747},
year = {2022}
}
Comments
v1: 10 pages, 6 figures; v2: references added; v3: 12 pages, 7 figures, clarifications and references added, final version to appear in Nuclear Physics B