Quantum effects on the black hole shadow and deflection angle in the presence of plasma*

Atamurotov, Farruh; Jamil, Mubasher; Jusufi, Kimet

doi:10.1088/1674-1137/acaef7

Cited by 23 publications

(4 citation statements)

References 68 publications

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“…Additionally, the study of gravitational weak and strong lensing around compact objects surrounded by plasma can be found in Refs. [49][50][51][52][53][54][55][56][57][58][59][60][61][62][63][64][65][66][67].…”

Section: Introductionmentioning

confidence: 99%

Shadow and weak gravitational lensing for Ellis-Bronnikov wormhole*

Alloqulov,

Atamurotov,

Abdujabbarov

et al. 2024

Chinese Phys. C

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In this work we have investigated the gravitational weak lensing and shadow of the Ellis-Bronnikov wormhole. First, we have studied the photon motion in plasma medium and wormhole shadow. It has been shown that the radius of the photon sphere of the Ellis-Bronnikov wormhole and the size of the wormhole shadow becomes larger under the influence of the parameter $a$. The upper limit of the parameter $a$ in the Ellis-Bronnikov wormhole spacetime has been obtained. Second, we have investigated the weak gravitational lensing for the Ellis-Bronnikov wormhole and have calculated the deflection angle 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 influence of the parameter $a$ 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 wormhole in Ellis-Bronnikov theory.

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Section: Introductionmentioning

confidence: 99%

Shadow and weak gravitational lensing for Ellis-Bronnikov wormhole*

Alloqulov,

Atamurotov,

Abdujabbarov

et al. 2024

Chinese Phys. C

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“…It would take more years, or even more sophisticated equipment, to probe other theories of gravity using the black hole. Ever since many authors have considered exploring the behavior of the classical shadow silhouette for black holes [15,18] described by either a toy model metric or through an alternative theory of gravity [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Testing symmergent gravity through the shadow image and weak field photon deflection by a rotating black hole using the M87$$^$$ and Sgr. $$\hbox {A}^$$ results

Pantig

Овгун²,

Demir

2023

Eur. Phys. J. C

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In this paper, we study rotating black holes in symmergent gravity, and use deviations from the Kerr black hole to constrain the parameters of the symmergent gravity. Symmergent gravity induces the gravitational constant G and quadratic curvature coefficient $$c_{\textrm{O}}$$ c O from the flat spacetime matter loops. In the limit in which all fields are degenerate in mass, the vacuum energy $$V_{\textrm{O}}$$ V O can be wholly expressed in terms of G and $$c_{\textrm{O}}$$ c O . We parametrize deviation from this degenerate limit by a parameter $${\hat{\alpha }}$$ α ^ such that the black hole spacetime is dS for $${\hat{\alpha }} < 1$$ α ^ < 1 and AdS for $${\hat{\alpha }} > 1$$ α ^ > 1 . In constraining the symmergent parameters $$c_{\textrm{O}}$$ c O and $${\hat{\alpha }}$$ α ^ , we utilize the EHT observations on the M87* and Sgr. A* black holes. We investigate first the modifications in the photon sphere and shadow size, and find significant deviations in the photonsphere radius and the shadow radius with respect to the Kerr solution. We also find that the geodesics of time-like particles are more sensitive to symmergent gravity effects than the null geodesics. Finally, we analyze the weak field limit of the deflection angle, where we use the Gauss-Bonnet theorem for taking into account the finite distance of the source and the receiver to the lensing object. Remarkably, the distance of the receiver (or source) from the lensing object greatly influences the deflection angle. Moreover, $$c_{\textrm{O}}$$ c O needs be negative for a consistent solution. In our analysis, the rotating black hole acts as a particle accelerator and possesses the sensitivity to probe the symmergent gravity.

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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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Quantum effects on the black hole shadow and deflection angle in the presence of plasma*

Cited by 23 publications

References 68 publications

Shadow and weak gravitational lensing for Ellis-Bronnikov wormhole*

Shadow and weak gravitational lensing for Ellis-Bronnikov wormhole*

Testing symmergent gravity through the shadow image and weak field photon deflection by a rotating black hole using the M87$$^$$ and Sgr. $$\hbox {A}^$$ results

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

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Quantum effects on the black hole shadow and deflection angle in the presence of plasma*

Cited by 23 publications

References 68 publications

Shadow and weak gravitational lensing for Ellis-Bronnikov wormhole*

Shadow and weak gravitational lensing for Ellis-Bronnikov wormhole*

Testing symmergent gravity through the shadow image and weak field photon deflection by a rotating black hole using the M87$$^*$$ and Sgr. $$\hbox {A}^*$$ results

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

Contact Info

Product

Resources

About

Testing symmergent gravity through the shadow image and weak field photon deflection by a rotating black hole using the M87$$^$$ and Sgr. $$\hbox {A}^$$ results