Shadows of rotating quintessential black holes in Einstein–Gauss–Bonnet gravity with a cloud of strings

Belhaj, A.; Sekhmani, Yassine

doi:10.1007/s10714-022-02902-x

Cited by 31 publications

(15 citation statements)

References 40 publications

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“…Showing the optical behaviour pertinent to our black hole solution is the primary objective of this section. Well, taking advantage of many works regarding shadow behaviours [ 30,31 ] helps us discover in an easy way a one‐dimensional closed curve on the image plane. Indeed, an examination of the optical aspect, particularly the shadow image, arises from considering the Hamilton‐Jacobi action [ 32,33 ]

\begin{equation} \frac{\partial \mathcal {S}}{\partial \delta }+H=0, \end{equation}

where

\mathcal {S}

and δ are the Jacobi action and the affine parameter along the geodesics, respectively.…”

Section: Optical Properties Of the Black Holementioning

confidence: 99%

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Joule‐Thomson Expansion and Optical Behaviour of Reissner‐Nordström‐Anti‐de Sitter Black Holes in Rastall Gravity Surrounded by a Quintessence Field

Gogoi

Sekhmani

Kalita

et al. 2023

Fortschritte der Physik

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This paper deals with the thermodynamics, Joule‐Thomson expansion and optical behaviour of a Reissner‐Nordström‐anti‐de Sitter black hole in Rastall gravity surrounded by a quintessence field. The black hole solution obtained in this framework is different from a corresponding black hole in General Relativity. The black hole metric function, as well as the Hawking temperature, is affected by the presence of energy‐momentum conservation violation. The presence of energy‐momentum conservation violation also affects the isenthalpic and inversion temperature curves, and with an increase in the Rastall parameter, the inversion temperature rises slowly. The impacts of other parameters, such as charge, structural constant etc., are investigated and compared. The black hole shadow, as well as the energy emission rate of the black hole, decreases with an increase in the Rastall parameter. Hence, the black holes evaporate slowly in presence of energy‐momentum conservation violation.

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\begin{equation} \frac{\partial \mathcal {S}}{\partial \delta }+H=0, \end{equation}

where

\mathcal {S}

and δ are the Jacobi action and the affine parameter along the geodesics, respectively.…”

Section: Optical Properties Of the Black Holementioning

confidence: 99%

“…However, from Figure 5, one can see that with an increase in the parameter 𝛽, T H increases, and the crest is more distinct for smaller values of 𝛽. We use Equation (30) to obtain the expression of pressure in terms of T H as…”

Section: Characteristics Of the Solutionmentioning

confidence: 99%

Joule‐Thomson Expansion and Optical Behaviour of Reissner‐Nordström‐Anti‐de Sitter Black Holes in Rastall Gravity Surrounded by a Quintessence Field

Gogoi

Sekhmani

Kalita

et al. 2023

Fortschritte der Physik

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“…For invisible black holes, their silhouettes was also investigated [29]. The research on BH shadows has been expanded to many aspects in recent years [30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47].…”

Section: Introductionmentioning

confidence: 99%

Observational appearances of magnetically charged black holes in Born–Infeld electrodynamics

2023

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In this paper, we investigate the observational appearances of magnetically charged black holes in Born–Infeld (BI) electrodynamics. We examine the effects of the magnetic charge and the BI parameter on the geodesics with different impact parameters. Using the backward ray tracing method, we investigate how spherically symmetric accretions interact with black hole shadows and photon spheres. The shadows of infalling accretion are darker than that of static ones. Moreover, the radius of the photon sphere is an intrinsic property of the spacetime independent of accretions. We then study how the thin disk models affect the black hole shadows. After obtaining the transfer functions, we divide photons emitted from the thin disk into three categories: direct emission, lens ring, and photon ring. Applying three emission models, we find that the width of the shadow is dominated by the direct emission, the photon ring and the lens ring can hardly be identified by changing the emission models.

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“…Recent observations have managed to show, with the help of informatics data, a simulated image with regard to black objects. Roughly speaking, the M87* picture [34,35], yielded an intensive study of the black hole shadow in different gravity models [36][37][38][39][40][41][42][43].…”

Section: Introductionmentioning

confidence: 99%

$${\textbf{D}}$$-dimensional dyonic AdS black holes with quasi-topological electromagnetism in Einstein Gauss–Bonnet gravity

et al. 2022

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Within Gauss–Bonnet gravity, we construct a solution endowed with dyonic matter fields in a higher dimension. The quasi-topological electromagnetism generates two kinds of contributions; one is the kinetic terms, and the second refers to the interactif terms. This overcomes the invariance topological problem. We investigate the thermodynamical proprieties of the obtained solution, namely, ADM mass, Hawking temperature, and entropy. To inspect the local stability, we examine the associated heat capacity. With regards to optical proprieties, we analyze the null geodesic in terms of the given parameter space. The shadow radius is a generating form with all the physical parameters that govern the shadow behavior. The study restricts only the taking of the effects of the D and $$\alpha $$ α parameters. Finally, we examine the impact of the dimension D, GB coupling constant $$\alpha $$ α , the cosmological constant $$\Lambda $$ Λ , the electric $$q_e$$ q e , the magnetic charge $$q_m$$ q m and the coupling constant $$\beta $$ β on the energy emission rate.

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Shadows of rotating quintessential black holes in Einstein–Gauss–Bonnet gravity with a cloud of strings

Cited by 31 publications

References 40 publications

Joule‐Thomson Expansion and Optical Behaviour of Reissner‐Nordström‐Anti‐de Sitter Black Holes in Rastall Gravity Surrounded by a Quintessence Field

Joule‐Thomson Expansion and Optical Behaviour of Reissner‐Nordström‐Anti‐de Sitter Black Holes in Rastall Gravity Surrounded by a Quintessence Field

Observational appearances of magnetically charged black holes in Born–Infeld electrodynamics

$${\textbf{D}}$$-dimensional dyonic AdS black holes with quasi-topological electromagnetism in Einstein Gauss–Bonnet gravity

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