212 citations · 6.6k across the 163 of their papers we have counts for
14 papers · 1 filter
Effect of the cosmological constant on the deflection angle by a rotating cosmic string
Kimet Jusufi, Ali Övgün
We report the effect of the cosmological constant and the internal energy density of a cosmic string on the deflection angle of light in the spacetime of a rotating cosmic string w…
Hawking radiation and propagation of massive charged scalar field on a three-dimensional Gödel black hole
P. A. González, Ali Övgün, Joel Saavedra +1
In this paper we consider the three-dimensional Gödel black hole as a background and we study the vector particle tunneling from this background in order to obtain the Hawking temp…
Relativistic Bose--Einstein condensates thin-shell wormholes
M. G. Richarte, I. G. Salako, J. P. Morais Graça +2
We construct traversable thin-shell wormholes which are asymptotically Ads/dS applying the cut and paste procedure for the case of an acoustic metric created by a relativistic Bose…
Tunneling of Glashow-Weinberg-Salam model particles from Black Hole Solutions in Rastall Theory
Ali Övgün, Wajiha Javed, Riasat Ali
Using the semiclassical WKB approximation and Hamilton-Jacobi method, we solve an equation of motion for the Glashow-Weinberg-Salam model, which is important for understanding the…
Falsifying cosmological models based on a non-linear electrodynamics
Ali Övgün, Genly Leon, Juan Magaña +1
Recently, the nonlinear electrodynamics (NED) has been gaining attention to generate primordial magnetic fields in the Universe and also to resolve singularity problems. Moreover,…
Quantum Tunneling and Quasinormal Modes in the Spacetime of Alcubierre Warp Drive
Kimet Jusufi, İzzet Sakallı, Ali Övgün
In a seminal paper, Alcubierre showed that Einstein's theory of general relativity appears to allow a super-luminal motion. In the present study, we use a recent eternal-warp-drive…
Quasinormal Modes of a Schwarzschild Black Hole Immersed in an Electromagnetic Universe
Ali Övgün, Izzet Sakalli, Joel Saavedra
We study the quasinormal modes (QNMs) of the Schwarzschild black hole immersed in an electromagnetic (em) universe. The immersed Schwarzschild black hole (ISBH) is originated from…
Light Deflection by a Quantum Improved Kerr Black Hole Pierced by a Cosmic String
Kimet Jusufi, Ali Övgün
In this work, we calculate the quantum correction effects on the deflection of light in the spacetime geometry of a quantum improved Kerr black hole pierced by an infinitely long c…
The Effect of the Gauss-Bonnet term to Hawking Radiation from arbitrary dimensional Black Brane
Xiao-Mei Kuang, Joel Saavedra, Ali Övgün
We investigate the probabilities of the tunneling and the radiation spectrums of the massive spin-1 particles from arbitrary dimensional Gauss-Bonnet-Axions (GBA) Anti-de Sitter (A…
Stability of Effective Thin-shell Wormholes Under Lorentz Symmetry Breaking Supported by Dark Matter and Dark Energy
Ali Övgün, Kimet Jusufi
In this paper, we construct generic, spherically symmetric thin-shell wormholes and check their stabilities using the unified dark sector, including dark energy and dark matter. We…
Eruptive Massive Vector Particles of 5-Dimensional Kerr-Gödel Spacetime
A. Övgün, I. Sakalli
In this paper, we investigate Hawking radiation of massive spin-1 particles from 5-dimensional Kerr-Gödel spacetime. By applying the WKB approximation and the Hamilton-Jacobi ansat…
Charged Thin-shell Gravastars in Noncommutative Geometry
Ali Övgün, Ayan Banerjee, Kimet Jusufi
In this paper we construct a charged thin-shell gravastar model within the context of noncommutative geometry. To do so, we choose the interior of the nonsingular de Sitter spaceti…
Tunneling of Massive/Massless Bosons From the Apparent Horizon of FRW Universe
Kimet Jusufi, Ali Ovgun, Gordana Apostolovska
In this article we investigate the Hawking radiation of vector particles from the apparent horizon of a Friedmann-Robertson-Walker (FRW) universe in the framework of quantum tunnel…
Thin-Shell Wormholes in Neo-Newtonian Theory
Ali Övgün, Ines G. Salako
In this paper, we constructed an acoustic thin-shell wormhole (ATW) under neo-Newtonian theory using the Darmois-Israel junction conditions. To determine the stability of the ATW b…