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Light Trajectories and Thermal Shadows casted by Black Holes in a Cavity | | A. Belhaj
; H. Belmahi
; M. Benali
; M. Oualaid
; M. B. Sedra
; | | Date: |
1 Jun 2022 | | Abstract: | We explore the shadows and the photon rings casted by black holes in cavity.
Placing the observer inside such an isothermal background, we examine the
influence of the cavity temperature T_{cav} and the charge Q on the involved
optical aspect. After studying the effect of the horizon radius by varying Q,
we investigate the thermal behaviors of the black hole shadows in a cavity. For
fixed charge values, we find that the shadow radius r_s increases by decreasing
T_{cav}. Varying such a temperture, we discuss the associated energy emission
rate. After that, we show that the curves in the r_s-T_{cav} plane share
similarities with the G-T curves of the Anti de Sitter (AdS) black holes. Then,
we study the trajectory of the light rays casted by black holes in a cavity. We
further observe that the light trajectory behaviors are different than the ones
of the non rotating black holes due to the cavity effect. Finally, we provide
evidence for the existence of an universal ratio defined in terms of the photon
sphere radius and the impact parameter. Concretely, we obtain a optical ratio
frac{b_{sp}}{r_{sp}} sim sqrt 3. | | Source: | arXiv, 2206.00615 | | Services: | Forum | Review | PDF | Favorites | |
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