The Observational Shadow Features of a Renormalization Group Improved Black Hole Considering Spherical Accretions

Chen, Yunxian; Mou, Ping-Hui; Li, Guoping

doi:10.3390/sym14101959

Cited by 5 publications

(4 citation statements)

References 76 publications

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“…The final step is to transform the new metric into the Boyer-Lindquist coordinates with the transformations du = dt + λ(r)dr, dϕ = dϕ + χ(r)dr (27) where the transformation functions are…”

Section: Rotating Charged Black Hole With Scalar Q-hairmentioning

confidence: 99%

“…The photons escaping from the spherical orbits form the boundary of the dark silhouette of the black hole, which is known as black hole shadow from the outside observers [6,7]. Thus, the ability of the black hole shadow to indicate the geometry around black hole is widely researched, especially, the characterization of the properties near the horizon [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

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Shadow Cast of Rotating Charged Black Hole with Scalar Q-Hair

Guo

Kuang

2022

Symmetry

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In this paper, we investigate the shadow cast by non-rotating and rotating charged black holes with scalar Q-hair. We find that in addition to the spin parameter of black hole and inclination angle of the observer, the charge parameter and the self-interaction parameters of the scalar hair also influence the shape of the black hole shadow. Our studies show that the charged black holes with scalar Q-hair always have smaller shadow size compared to those without hair. Moreover, it is found that the parameters significantly affect the shadow observables. In particular, for the fixed spin parameter and inclination angle, a larger charge parameter will increase the shadow size but decrease the shadow distortion, whilst stronger self-interaction parameters have the opposite influence. In short, the shadow of the charged black hole with scalar Q-hair can be distinguished from the Reissner–Nordstro¨m (RN) black hole or Kerr–Newmann (KN) black hole, and they indeed generate new templates with large deviations from general relativity those are invariably smaller in size.

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Section: Rotating Charged Black Hole With Scalar Q-hairmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Shadow Cast of Rotating Charged Black Hole with Scalar Q-Hair

Guo

Kuang

2022

Symmetry

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“…Recently, several works have considered the quantum improvement black hole solutions to investigate their properties [39][40][41][42][43][44][45]. For example, in Ref.…”

Section: Introductionmentioning

confidence: 99%

“…[41] and the quantum effects on the black hole shadow and deflection angle in the presence of plasma were studied by Atamurotov et al in Refs. [42,43] investigates its observational features.…”

Section: Introductionmentioning

confidence: 99%

Charged spinning and magnetized test particles orbiting quantum improved charged black holes

Ladino,

Benavides-Gallego,

Larrañaga

et al. 2023

Eur. Phys. J. C

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In the present work, we aimed to investigate the dynamics of spinning charged and magnetized test particles around both electrically and magnetically charged quantum-improved black holes. We derive the equations of motion for charged spinning test particles using the Mathisson-Papapetrou-Dixon ***equations with the Lorentz coupling term. The radius of innermost stable circular orbits (ISCOs), specific angular momentum, and energy for charged spinless, uncharged spinning, and charged spinning test particles around the charged and non-charged quantum-improved black holes are analyzed separately. We found that the quantum parameter increases the maximum spin value, $$s_\textrm{max}$$ s max , which leads to the nonphysical motion (superluminal motion) of the charged spinning test particle. In contrast, the black hole charge decreases its value. We also found that, in contrast to the Reissner Nordström black hole, spinning charged test particles in the quantum-improved charged black hole have higher $$s_\textrm{max}$$ s max ; moreover, positively charged spinning particles can have higher values of $$s_\textrm{max}$$ s max near the extreme black hole cases when compared with uncharged spinning particles. Finally, we investigate the magnetized test particle’s dynamics in the spacetime of a quantum-improved magnetically charged black hole in Quantum Einstein Gravity using the Hamilton–Jacobi equation. We show that the presence of $$\omega $$ ω increases the maximum value of the effective potential and decreases the minimum energy and angular momentum of magnetized particles at their circular orbits. We found an upper constraint in the black hole charge at the ISCO.

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Shadow and gravitational weak lensing for quantum improved charged black hole in plasma*

Alloqulov,

Atamurotov,

Abdujabbarov

et al. 2024

Chinese Phys. C

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We have investigated the shadow and weak gravitational lensing for the quantum-improved charged black hole (BH). Firstly, the photon motion and BH shadow are studied in a plasma medium. It can be seen from our analysis that the radius of the photon sphere of the quantum-improved charged BH and the size of the BH shadow decreased under the influence of the plasma parameter $\Omega$. Furthermore, the gravitational weak lensing is considered for the quantum-improved charged BH and we have obtained the deflection angle of light rays around compact object for uniform and non-uniform plasma cases. It has been shown that the value of the deflection angle for uniform plasma increased with the increase of the plasma parameter and for non-uniform plasma vice versa. It has been also indicated that under the influence of the plasma parameter $\Omega$ and the BH charge $Q$ the values of the deflection angles for two cases are decreased. Finally, we have investigated the magnification of image brightness using the deflection angle of the light rays around the quantum-improved charged BH.

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The Observational Shadow Features of a Renormalization Group Improved Black Hole Considering Spherical Accretions

Cited by 5 publications

References 76 publications

Shadow Cast of Rotating Charged Black Hole with Scalar Q-Hair

Shadow Cast of Rotating Charged Black Hole with Scalar Q-Hair

Charged spinning and magnetized test particles orbiting quantum improved charged black holes

Shadow and gravitational weak lensing for quantum improved charged black hole in plasma*

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