Shadow of rotating regular black holes

Abdujabbarov, Ahmadjon; Amir, M. Jamil; Ahmedov, Bobomurat; Ghosh, Sushant G.

doi:10.1103/physrevd.93.104004

Cited by 345 publications

(221 citation statements)

References 57 publications

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“…Thus a similar picture for FPOs holds for many rotating BHs, leading, in particular, to (qualitatively) Kerr-like shadows. Examples exist both in GR and beyond GR [30][31][32][33][34][35][36][37][38][39].…”

Section: Kerr (And Kerr-like) Fposmentioning

confidence: 99%

Fundamental photon orbits: Black hole shadows and spacetime instabilities

2017

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The standard black holes (BHs) in general relativity, as well as other ultracompact objects (with or without an event horizon) admit planar circular photon orbits. These light rings (LRs) determine several spacetime properties. For instance, stable LRs trigger instabilities and, in spherical symmetry, (unstable) LRs completely determine BH shadows. In generic stationary, axisymmetric spacetimes, nonplanar bound photon orbits may also exist, regardless of the integrability properties of the photon motion. We suggest a classification of these fundamental photon orbits (FPOs) and, using Poincaré maps, determine a criterion for their stability. For the Kerr BH, all FPOs are unstable (similar to its LRs) and completely determine the Kerr shadow. But in non-Kerr spacetimes, stable FPOs may also exist, even when all LRs are unstable, triggering new instabilities. We illustrate this for the case of Kerr BHs with Proca hair, wherein, moreover, qualitatively novel shadows with a cuspy edge exist, a feature that can be understood from the interplay between stable and unstable FPOs. FPOs are the natural generalization of LRs beyond spherical symmetry and should generalize the LRs key role in different spacetime properties.

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Section: Kerr (And Kerr-like) Fposmentioning

confidence: 99%

Fundamental photon orbits: Black hole shadows and spacetime instabilities

2017

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“…Properties of the geodesic motion in the field of regular black holes have been recently discussed in [33][34][35][36]. A detailed discussion of the circular geodesics of the regular Bardeen and Ayon-Beato-Garcia (ABG) black hole and no-horizon spacetimes and its implication to simple optical phenomena can be found in [31].…”

Section: Introductionmentioning

confidence: 99%

“…In this subsection we study in detail the circular orbits of the test particles around the rotating regular black holes related to the Maxwell weak field limit of the nonlinear electrodynamics, i.e., the new type of regular black hole classes with ν = 1 (36) 3 . In this case the condition for existence of the circular orbits (80) is written in the form…”

Section: A Circular Orbits Around Rotating Maxwellian Regular Black mentioning

confidence: 99%

Generic rotating regular black holes in general relativity coupled to nonlinear electrodynamics

2017

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We construct regular rotating black hole and no-horizon spacetimes based on the recently introduced spherically symmetric generic regular black hole spacetimes related to electric or magnetic charge under nonlinear electrodynamics coupled to general relativity that for special values of the spacetime parameters reduce to the Bardeen and Hayward spacetimes. We show that the weak and strong energy conditions are violated inside the Cauchy horizons of these generic rotating black holes. We give the boundary between the rotating black hole and no-horizon spacetimes and determine the black hole horizons and the boundary of the ergosphere. We introduce the separated Carter equations for the geodesic motion in these rotating spacetimes. For the most interesting new class of the regular spacetimes, corresponding for magnetic charges to the Maxwell field in the weak field limit of the nonlinear electrodynamics, we determine the structure of the circular geodesics and discuss their properties. We study the epicyclic motion of a neutral particle moving along the stable circular orbits around the "Maxwellian" rotating regular black holes. We show that epicyclic frequencies measured by the distant observers and related to the oscillatory motion of the neutral test particle along the stable circular orbits around the rotating singular and regular Maxwellian black holes are always smaller than ones in the Kerr spacetime.

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“…Finally, we have examined the shadow of a charged rotating NC BH in the presence of plasma. The existence of plasma increases the size of the shadow and deformation in the shape reduces due to the presence of NC charge which is analogous to [75]. We conclude that the presence of an NC charge not only affects the particle orbits but also affects the shadow of the BH.…”

Section: Final Remarksmentioning

confidence: 74%

Shadow of a charged rotating non-commutative black hole

Sharif

Iftikhar

2016

Eur. Phys. J. C

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This paper investigates the shadow of a charged rotating non-commutative black hole. For this purpose, we first formulate the null geodesics and study the effects of a non-commutative charge on the photon orbit. We then explore the effect of spin, angle of inclination as well as noncommutative charge on the silhouette of the shadow. It is found that shape of the shadow deviates from the circle with the decrease in the non-commutative charge. We also discuss observable quantities to study the deformation and distortion in the shadow cast by the black hole which decreases for small values of a non-commutative charge. Finally, we study the shadows in the presence of plasma. We conclude that the non-commutativity has a great impact on the black hole shadow.

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Shadow of rotating regular black holes

Cited by 345 publications

References 57 publications

Fundamental photon orbits: Black hole shadows and spacetime instabilities

Fundamental photon orbits: Black hole shadows and spacetime instabilities

Generic rotating regular black holes in general relativity coupled to nonlinear electrodynamics

Shadow of a charged rotating non-commutative black hole

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