Superentropic AdS black hole shadows

We study shadow aspects of superentropic black holes in four dimensions. Using Hamilton-Jacobi formalism, we first get the null geodesic equations. In the celestial coordinate framework relying on with fixed positions of observers, we investigate the shadow behaviors in terms of the mass and the cosmological scale variation parameters. Among others, we obtain ellipse shaped geometries contrary to usual black hole solutions. Modifying the ordinary relations describing geometrical observables, we discuss the size and the shape deformation parameters of these non-trivial geometric forms. Due to horizonless limits associated whit certain mass values, we explore the shadow of the naked singularity of such black holes. (c) 2021 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP3.

Automated summary

This study focuses on the shadow aspects of superentropic black holes in four dimensions using the Hamilton-Jacobi formalism. By analyzing the shadow behaviors in celestial coordinates with fixed observer positions, ellipse shaped geometries contrary to usual black hole solutions are observed. The modifications made to the ordinary relations describing geometrical observables lead to discussions on size and shape deformation parameters of these non-trivial geometric forms, as well as exploring the shadow of naked singularities associated with certain mass values.