Shadow and Photon Sphere of Black Hole in Clouds of Strings and Quintessence

He, Aoyun; Tao, Jun; Xue, Yadong; Zhang, Lingkai

doi:10.48550/arxiv.2109.13807

Cited by 5 publications

(6 citation statements)

References 61 publications

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“…Therefore, we first need to find the closest distance r 0 , which is the value of r when dr dφ = 0. From equation (21) we have…”

Section: Gravitational Lensing By Emd Black Holesmentioning

confidence: 99%

“…The first study of black hole shadow for a Schwarzschild black hole and a rotating Kerr space-time was carried out in [5] and [6], respectively. Such studies have received significant attention in recent years and have been widely investigated in modified theories of gravity [7]- [21]. Therefore, the study of null geodesics around black holes would help us to understand the properties of such objects and the geometric properties of the corresponding space-times.…”

Section: Introductionmentioning

confidence: 99%

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On null geodesics and shadow of hairy black holes in Einstein-Maxwell-dilaton gravity

Heydari-Fard,

Sepangi

2021

Preprint

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The time-like and null-like geodesics around compact objects are some of the best tools to classify and understand the structure of a space-time. In this paper, we study the null geodesics around charged static dilaton black holes in Einstein-Maxwell-dilaton gravity. The physical parameters for non-radial geodesics including the effective potential, effective force, radius of the photon sphere and impact parameter are obtained and effects of the charge parameter and dilaton coupling constant on these quantities are studied. Possible photon motions for different values of the impact parameter are analyzed and unstable circular orbits and unbounded orbits are plotted. These results are compared to that of the Schwarzschild, Reissner-Nordstrom and GMGHS black holes. Also, we study the shadow cast by a dilaton black hole and investigate how the dilaton coupling affects the size of the black hole shadow. Finally, as an application of null geodesics, we calculate the deflection of light and investigate the effects of the model parameters on the bending angle.

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“…Therefore, we first need to find the closest distance r 0 , which is the value of r when dr dφ = 0. From equation (21) we have…”

Section: Gravitational Lensing By Emd Black Holesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On null geodesics and shadow of hairy black holes in Einstein-Maxwell-dilaton gravity

Heydari-Fard,

Sepangi

2021

Preprint

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“…The first-order phase transition of the charged Reissner Nordstrom-AdS (RN-AdS) black hole has been studied in different backgrounds including Dark Energy (DE) and Dark Matter (DM) [22,41,42]. In this way, the shadows and the deflection angle of the light rays by black holes in arbitrary dimensions have been discussed in [22,25,41,43]. The effect of DE and the space-time dimension on the involved optical quantities has been inspected.…”

Section: Introductionmentioning

confidence: 99%

Shadow thermodynamics of non-linear charged Anti-de Sitter black holes

Du,

Li,

Zhou

et al. 2022

Preprint

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Non-linear interaction between the electromagnetic fields (EMF) are occurred when vacuum polarization in quantum electrodynamics (QED) happens. The field of non-linear electrodynamics which may be resulting from this interaction could have important effects on black hole physics. In this work, we investigate the relationship between the observable quantity, the shadow radius and the first-order phase transition for the non-linear charged AdS black hole in the frame of the Einstein-power-Yang-Mills (EPYM) gravity. Through the analysis, we find with a certain condition there exist the non-monotonic behaviors between the shadow radius, the horizon radius, and temperature (or pressure). And from the viewpoint of the shadow radius, the phase transition temperature is higher than that from the viewpoint of the horizon radius with the same condition. These indicate that the shadow radius can be regarded a probe to reveal the thermodynamic phase transition information of black holes. When the system is undergoing the phase transition in two cases of the different non-linear YM charge parameter values: γ = 1, 1.5, the thermal profiles of the coexistent big and small black hole phases with the temperature are presented. Furthermore, the effects of non-linear YM charge parameter on the shadow radius and the thermal profile are also investigated.

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“…This region called shadow is surrounded by a bright ring known as the photon sphere. Since the elaboration of such an image and the associated data by EHT, various works dealing with the geometric properties of the black hole shadows have been proposed by examining the involved sizes and shapes [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

“…The effect of such a dark sector on the optical aspect has been also investigated for different backgrounds. In this way, the shadows and the deflection angle of the light rays by black holes in arbitrary dimensions have been discussed in [12,[20][21][22]. The effect of DE and the space-time dimension on the involved optical quantities has been inspected.…”

Section: Introductionmentioning

confidence: 99%

Light Trajectories and Thermal Shadows casted by Black Holes in a Cavity

Belhaj¹,

Belmahi²,

Benali³

et al. 2022

Preprint

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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 bsp rsp ∼ √ 3.

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Shadow and Photon Sphere of Black Hole in Clouds of Strings and Quintessence

Cited by 5 publications

References 61 publications

On null geodesics and shadow of hairy black holes in Einstein-Maxwell-dilaton gravity

On null geodesics and shadow of hairy black holes in Einstein-Maxwell-dilaton gravity

Shadow thermodynamics of non-linear charged Anti-de Sitter black holes

Light Trajectories and Thermal Shadows casted by Black Holes in a Cavity

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