Weak deflection angle, Hawking radiation, greybody bound and shadow cast for static black hole in the framework of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si7.svg" display="inline" id="d1e1178"><mml:mrow><mml:mi>f</mml:mi><mml:mrow><mml:mo>(</mml:mo><mml:mi>R</mml:mi><mml:mo>)</mml:mo></mml:mrow></mml:mrow></mml:math> gravity

Mandal, Surajit

doi:10.1016/j.dark.2023.101374

Physics of the Dark Universe

2023

DOI: 10.1016/j.dark.2023.101374

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Weak deflection angle, Hawking radiation, greybody bound and shadow cast for static black hole in the framework of f(R) gravity

Surajit Mandal

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2024

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Cited by 3 publications

References 151 publications

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Quasinormal modes-shadow correspondence for rotating regular black holes

Pedrotti,

Vagnozzi

2024

Phys. Rev. D

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Quasinormal modes-shadow correspondence for rotating regular black holes

Pedrotti,

Vagnozzi

2024

Phys. Rev. D

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GUP corrected black holes with cloud of string

Al-Badawi,

Shaymatov,

Jha

et al. 2024

Eur. Phys. J. C

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We investigate shadows, deflection angle, quasinormal modes (QNMs), and sparsity of Hawking radiation of the Schwarzschild string cloud black hole’s solution after applying quantum corrections required by the Generalised Uncertainty Principle (GUP). First, we explore the shadow’s behaviour in the presence of a string cloud using three alternative GUP frameworks: linear quadratic GUP (LQGUP), quadratic GUP (QGUP), and linear GUP. We then used the weak field limit approach to determine the effect of the string cloud and GUP parameters on the light deflection angle, with computation based on the Gauss–Bonnet theorem. Next, to compute the quasinormal modes of Schwarzschild string clouds incorporating quantum correction with GUP, we determine the effective potentials generated by perturbing scalar, electromagnetic and fermionic fields, using the sixth-order WKB approach in conjunction with the appropriate numerical analysis. Our investigation indicates that string and linear GUP parameters have distinct and different effects on QNMs. We find that the greybody factor increases due to the presence of string cloud while the linear GUP parameter shows the opposite. We then examine the radiation spectrum and sparsity in the GUP corrected black hole with the cloud of string framework, which provides additional information about the thermal radiation released by black holes. Finally, our inquiries reveal that the influence of the string parameter and the quadratic GUP parameter on various astrophysical observables is comparable, however the impact of the linear GUP parameter is opposite.

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Geodesics structure and deflection angle of electrically charged black holes in gravity with a background Kalb–Ramond field

Al-Badawi,

Shaymatov,

Sakallı

2024

Eur. Phys. J. C

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This article investigates the geodesic structure and deflection angle of charged black holes in the presence of a nonzero vacuum expectation value background of the Kalb–Ramond field. Topics explored include null and timelike geodesics, energy extraction by collisions, and the motion of charged particles. The photon sphere radius is calculated and plotted to examine the effects of both the black hole charge (Q) and the Lorentz-violating parameter (b) on null geodesics. The effective potential for timelike geodesics is analyzed, and second-order analytical orbits are derived. We further show that the combined effects of Lorentz-violating parameter and electric charge can mimic a Kerr black hole spin parameter up to its maximum values, i.e., $$a/M \sim 1$$ a / M ∼ 1 thus suggesting that the current precision of measurements of highly spinning black hole candidates may not rule out the effect of Lorentz-violating parameter. The center of mass energy of colliding particles is also considered, demonstrating a decrease with increasing Lorentz-violating parameter. Circular orbiting particles of charged particles are discovered, with the minimum radius for a stable circular orbit decreasing as both b and Q increase. Results show that this circular orbit is particularly sensitive to changes in the Lorentz-violating parameter. Additionally, a timelike particle trajectory is demonstrated as a consequence of the combined effects of parameters b and Q. Finally, the light deflection angle is analyzed using the weak field limit approach to determine the Lorentz-breaking effect, employing the Gauss–Bonnet theorem for computation. Findings are visualized with appropriate plots and thoroughly discussed.

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Weak deflection angle, Hawking radiation, greybody bound and shadow cast for static black hole in the framework of f(R) gravity

Cited by 3 publications

References 151 publications

Quasinormal modes-shadow correspondence for rotating regular black holes

Quasinormal modes-shadow correspondence for rotating regular black holes

GUP corrected black holes with cloud of string

Geodesics structure and deflection angle of electrically charged black holes in gravity with a background Kalb–Ramond field

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