Shadow images and observed luminosity of the Bardeen black hole surrounded by different accretions *

He, Kun; Guo, Sen; Tan, Shuang-Cheng; Li, Guoping

doi:10.1088/1674-1137/ac67fe

Cited by 25 publications

(15 citation statements)

References 76 publications

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“…Such photon rings are a trademark of a given geometry, thus potentially harbouring a way to make robust tests of the Kerr hypothesis [30][31][32][33]. While EHT observations may be successfully reproduced with a Kerr black hole supplied within General Relativistic Magnetic-Hydrodynamical (GRMHD) simulations of an accretion disk model [34], many works in the literature have sought for modifications to GR canonical black holes via addition of new fields [35][36][37][38][39] and hairy black holes [40,41], horizonless compact objects such as naked singularities [42,43], black bounces [44,45], boson stars [46][47][48][49], rotating [50] and asymmetric wormholes [51,52], as well as modified black holes beyond GR within Gauss-Bonnet [53], asymptotic safety [54], noncommutative geometry [55], Einstein-AEther [56], Horndeski theory [57,58], quadratic gravity [59], or braneworlds [60], to mention a few.…”

Section: Shadow and Photon Ring Observationsmentioning

confidence: 99%

“…We proceed first with the black hole configurations: Sch, RN2, RN1, FC1 and FCt, which are depicted in the set of Figures 6, 7, 8, 9, 10, respectively. On the top panel we depict the (normalized) image for the (from left to right) GLM3 (35), GLM1 (36) and GLM2 (37) emission models, while on the bottom panel we include the observed intensity profiles for the same models. There is nothing surprising in these plots as compared to our initial expectations and what we have in the Schwarzschild case of Fig.…”

Section: Generation Of Imagesmentioning

confidence: 99%

“…Figure 11. The optical appearance of EiBI RN0 configurations (top panel) in the GLM3(35), GLM1(36) and GLM2 (37) emission models, and the associated intensity for each of them (bottom panel), displaying the direct (m = 0) and photon ring (m = 1, 2, 3, 4, 5) emissions, respectively, via a number of peaks M > m.…”

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confidence: 99%

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Shadows and photon rings of regular black holes and geonic horizonless compact objects

Olmo¹,

Rosa²,

Rubiera-García³

et al. 2023

Preprint

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The optical appearance of a body compact enough to posses an unstable bound orbit, when surrounded by an accretion disk, is expected to be dominated by a luminous ring of radiation enclosing a central brightness depression known as the shadow, a picture fully backed up by the recent results of the EHT Collaboration. The characterization of both features -ring and shadowdepends on the interaction between the background geometry and the accretion disk, thus being a fertile playground to test our theories on the nature of compact objects and the gravitational field itself in the strong-field regime. In this work we use both features in order to test a continuous family of solutions interpolating between regular black holes and horizonless compact objects, which arise within the Eddington-inspired Born-Infeld theory of gravity, a viable extension of Einstein's General Relativity (GR). To this end we consider seven distinctive classes of such configurations (five black holes and two traversable wormholes) and study their optical appearances under illumination by a geometrically and optically thin accretion disk, emitting monochromatically with three analytic intensity profiles previously suggested in the literature. We build such images and consider the sub-ring structure created by light rays crossing the disk more than once and existing on top of the main ring of radiation. We discuss in detail the modifications as compared to their GR counterparts, the Lyapunov exponents of nearly unstable orbits, as well as the differences between black hole and traversable wormholes for the three intensity profiles. In addition we consider the properties of the shadow region and link them to the calibrated expectations by the EHT Collaboration. I. INTRODUCTIONA. Multimessenger quantum gravity era

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Section: Shadow and Photon Ring Observationsmentioning

confidence: 99%

Section: Generation Of Imagesmentioning

confidence: 99%

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Shadows and photon rings of regular black holes and geonic horizonless compact objects

Olmo¹,

Rosa²,

Rubiera-García³

et al. 2023

Preprint

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“…So far, some research results of black hole shadow surrounded by the different accretion models have been obtained. [47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62][63] As described in the studies, [64,65] Rastall proposed a possible modification of the general theory of relativity in 1972. According to the Rastall gravity theory, the covariant derivative of the energy momentum tensor is no longer zero in curved spacetime, whereby avoids the problem that the covariant conservation relation of the energy-momentum tensor is only verified in the Minkowaski flat or weak field regime of gravity.…”

Section: Introductionmentioning

confidence: 99%

The shadow and observation appearance of black hole surrounded by the dust field in Rastall theory

Zhu¹,

Chen²,

Mou³

et al. 2023

Chinese Phys. B

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In the context of Rastall gravity, the shadow and observation intensity casted by the new Kiselev-like black hole with dust field have been numerically investigated. In this system, the Rastall parameter and surrounding dust field structure parameter have considerable consequences on the geometric structure of spacetime. By considering the photon trajectories near the black hole, we investigate the variation of the radii of photon sphere, event horizon and black hole shadow under the different related parameters. Furthermore, by taking into account two different spherically symmetric accretion models as the only background light source, we also studied the observed luminosity and intensity of black holes. For the both spherical accretions background, the results show that the decrease or increase of the observed luminosity depends on the value range of relevant parameters, and the promotion effect is far less obvious than the attenuation effect on the observed intensity. One can find that the inner shadow region and outer bright region of the black hole wrapped by infalling accretion are significantly darker than those of the static model, which is closely related to the Doppler effect. In addition, the size of the shadow and the position of the photon sphere are always the same in the two accretion models, which means that the black hole shadow depend only on the geometry of spacetime, while the observation luminosity is affected by the form of accretion material and the related spacetime structure.

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“…We discussed the thermodynamic properties of the regular AdS BH and found their different features from the singular AdS BHs [29,30]. Meanwhile, the observation feature of the shadows and rings for the regular BH are investigated [31,32]. Based on these results, it is natural to ask whether the dependence of the BH shadow and thermodynamics may be structured in the regular spacetime and how the singularity affects this relation.…”

Section: Introductionmentioning

confidence: 99%

Shadow thermodynamics of AdS black hole in regular spacetime

Guo,

Li,

2022

Preprint

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The dependence of the black hole (BH) shadow and thermodynamics may be structured in the regular spacetime. Taking the regular Bardeen-AdS BH as an example, the relationship between the shadow radius and the event horizon radius is derived. It is found that these two radii display a positive correlation, implying that the BH temperature can be rewritten as a function of shadow radius in the regular spacetime. By analyzing the phase transition curves under the shadow context, we found that the shadow radius can replace the event horizon radius to present the BH phase transition process, and the phase transition grade can also be revealed by the shadow radius, indicating that the shadow radius may serve as a probe for the phase structure in the regular spacetime. Utilizing the temperature-shadow radius function, the thermal profile of the Bardeen-AdS BH is established. We obtained that the temperature shows an N-type change trend in P < P c situation. These results suggest that the phase transition process of the regular AdS BH can be completely presented in the thermal profile, and the relationship between the BH shadow and thermodynamics can also be established in the regular spacetime.

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Shadow images and observed luminosity of the Bardeen black hole surrounded by different accretions *

Cited by 25 publications

References 76 publications

Shadows and photon rings of regular black holes and geonic horizonless compact objects

Shadows and photon rings of regular black holes and geonic horizonless compact objects

The shadow and observation appearance of black hole surrounded by the dust field in Rastall theory

Shadow thermodynamics of AdS black hole in regular spacetime

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