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Usman A. Gillani

Publications and source records attributed to Usman A. Gillani.

5 recordsLinked to original sources
arXiv2023

Quantum tunneling from accelerating three-dimensional black hole

Hawking radiation as a quantum tunneling phenomena from accelerating BTZ black holes is presented in this work. We have calculated the Dirac particle's Hawking radiation from the horizon of the accelerating BTZ black hole. WKB approximation is applied to Dirac equation in the background of three dimensional black holes. This procedure gives us the tunneling probability, which we have used to calculate the Hawking temperature of the background three-dimensional black hole. Our study is consistent with the previous studies in the absence of the acceleration parameter. We have also studied the quantum corrections to the Hawking temperature of accelerating BTZ black hole.

hep-th↗
arXiv2021

The non-Kerr black hole with acceleration

The no-hair theorem can be tested in the strong gravity regime by using the top-bottom approach and the bottom-top approach. The non-Kerr spacetime of the later approach is an ideal framework to do the tests in the region very close to the black holes. In this work, we propose a non-Kerr black hole metric (and its charged extension) that is accelerating as well. These new objects are studied for their basic properties and thermodynamics.

gr-qc↗
arXiv2018

Linear cosmological perturbations in almost scale-invariant fourth-order gravity

We study a class of almost scale-invariant modified gravity theories, using a particular form of $f(R, G) = αR^2 + βG \log G$ where $R$ and $G$ are the Ricci and Gauss-Bonnet scalars, respectively and $α$, $β$ are arbitrary constants. We derive the Einstein-like field equations to first order in cosmological perturbation theory in longitudinal gauge.

gr-qc↗
arXiv2011

Tunneling of Dirac particles from accelerating and rotating black holes

Hawking radiation from black holes has been studied as a phenomenon of quantum tunneling of particles through their horizons. We have extended this approach to study the tunneling of Dirac particles from a large class of black holes which includes those with acceleration and rotation as well. We have calculated the tunneling probability of incoming and outgoing particles, and recovered the correct Hawking temperature by this method.

hep-th↗