A5017549358- Black Holes and Theoretical Physics
- Cosmology and Gravitation Theories
- Astrophysical Phenomena and Observations
- Pulsars and Gravitational Waves Research
- Noncommutative and Quantum Gravity Theories
- Relativity and Gravitational Theory
- Quantum Electrodynamics and Casimir Effect
- Adaptive optics and wavefront sensing
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Cosmic Phenomena
- Advanced Differential Geometry Research
- Solar and Space Plasma Dynamics
- Experimental and Theoretical Physics Studies
- Geophysics and Gravity Measurements
- Dark Matter and Cosmic Phenomena
- Fluid Dynamics and Turbulent Flows
- Heat Transfer Mechanisms
- Geophysics and Sensor Technology
- Nonlinear Waves and Solitons
- Computational Physics and Python Applications
- Stellar, planetary, and galactic studies
- Particle physics theoretical and experimental studies
- Methane Hydrates and Related Phenomena
- Oceanographic and Atmospheric Processes
- Structural Analysis and Optimization
Eastern Mediterranean University
2016-2025
Indian Institute of Technology Guwahati
2024
Shanghai Jiao Tong University
2024
Khazar University
2024
Mapúa University
2024
University of Sharjah
2021
Pontificia Universidad Católica de Valparaíso
2017-2020
University of Education
2020
COMSATS University Islamabad
2020
State University of Tetova
2017-2019
Horizon-scale images of black holes (BHs) and their shadows have opened an unprecedented window onto tests gravity fundamental physics in the strong-field regime. We consider a wide range well-motivated deviations from classical General Relativity (GR) BH solutions, constrain them using Event Horizon Telescope (EHT) observations Sagittarius A$^*$ (Sgr A$^*$), connecting size bright ring emission to that underlying shadow exploiting high-precision measurements Sgr A$^*$'s mass-to-distance...
In this paper the deflection angle of light by a rotating Teo wormhole spacetime is calculated in weak limit approximation. We mainly focus on revealing gravitational lensing as partially global topological effect. apply Gauss-Bonnet theorem (GBT) to optical geometry osculating Teo-Randers calculate angle. Furthermore we find same result using standard geodesic method. have found that can be written sum two terms, namely first term proportional throat and depends entirely geometry, while...
In this study, we found a new traversable wormhole solution in the framework of bumblebee gravity model. With these types models, Lorentz symmetry violation arises from dynamics vector field that is non-minimally coupled with gravity. To end, checked wormhole's flare-out and energy (null, weak, strong) conditions. We then studied deflection angle light weak limit approximation using Gibbons-Werner method. particular, show effect leads to non-trivial global topology spacetime. By Gauss-Bonnet...
In this paper, we discuss the effects of nonlinear electrodynamics (NED) on non-rotating black holes, parametrized by field coupling parameter $\beta$ and magnetic charge $P$ in detail. Particularly, survey physical properties magnetically charged hole, thermodynamic properties, observational appearance, quasinormal modes absorption cross sections. We then show that hole gets colder with increasing charge. Investigating heat capacity, see is thermally stable, which amplified introduction a...
In this paper, using the recent method proposed by Ono, Ishihara and Asada (OIA) who extend idea of Gibbons Werner to stationary axisymmetric case, we apply Gauss-Bonnet theorem optical metric non-rotating rotating Damour-Solodukhin wormholes spacetimes study weak gravitational lensing these objects. Furthermore, strong Bozza's see differences between lensing. We demonstrate relation deflection angle quasinormal modes wormholes. Interestingly it is found that wormhole parameter $\lambda$,...
Abstract Motivated by recent work on the Modified Maxwell (ModMax) black holes [Phys Lett B 10.1016/j.physletb.2020.136011], which are invariant in duality rotations and conformal transformations founded Rev D 10.1103/PhysRevD.102.121703], we probe its effects shadow cast, weak field gravitational lensing, neutrino propagation vicinity. Using EHT data for diameter of Sgr. A* M87*, LIGO/VIRGO experiments dyonic ModMax hole perturbations, find constraints parameters such as $$Q_\text {m}$$...
In this work, we observe that in the presence of string cloud parameter $a$ and quintessence $\gamma$, with equation state $\omega_q={-2}/{3}$ radius shadow Schwarzschild black hole increases as compared pure case. The existence both quintessential dark energy strings magnify size hence strength gravitational field around increases. Using data collected by Event Horizon Telescope (EHT) collaboration for M87* Sgr A*, obtain upper bounds on values parameters $\gamma$. Further, see effects...
In this paper, we investigated the effect of dark matter on weak deflection angle by black holes at galactic center. We consider three known density profiles such as Cold Dark Matter (CDM), Scalar Field (SFDM), and Universal Rotation Curve (URC) from Burkert profile. To achieve goal, used how positional angles are measured Ishihara et al. method based Gauss-Bonnet theorem (GBT) optical metric. With help non-asymptotic form GBT, longitudinal difference is also calculated. First, find...
Abstract The links between the deformation parameter $$\beta $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>β</mml:mi></mml:math> of generalized uncertainty principle (GUP) to two free parameters $$\hat{\omega }$$ xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mover><mml:mi>ω</mml:mi><mml:mo>^</mml:mo></mml:mover></mml:math> and $$\gamma xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>γ</mml:mi></mml:math> running Newtonian coupling constant Asymptotic Safe...
In this paper, we study rotating black holes in symmergent gravity, and use deviations from the Kerr hole to constrain parameters of gravity. Symmergent gravity induces gravitational constant $G$ quadratic curvature coefficient $c_{\rm O}$ flat spacetime matter loops. limit which all fields are degenerate mass, vacuum energy $V_{\rm can be wholly expressed terms O}$. We parametrize deviation by a parameter ${\hat \alpha}$ such that is dS for \alpha} < 1$ AdS > 1$. constraining \alpha}$,...
We investigate the shadow, deflection angle, and greybody bounding of a Schwarzschild-AdS/dS black hole in scale-dependent gravity. used EHT data to constrain parameter $ε$. have found that within $1σ$ level uncertainty, $εM_0$ ranges at $10^{-11} - 10^{-16}$ orders magnitude for Sgr. A*, 10^{-17}$ M87*. Using these parameters, we explored how shadow radius behaves as perceived by static observer. known parameters A* M87*, different cast behavior near cosmological horizon even if same...
Abstract In this paper, we obtain a new spherically symmetric black hole surrounded by the pseudo-isothermal dark matter halo. Furthermore, to explore effects of halo profile on rotating at M87 galactic center, derive solution encompassed using Newman-Janis method. Our investigation focuses impact event horizon, time-like and null orbits, as well shadow. We find that spin parameter increases, interval between inner horizon outer in diminishes. This leads formation an extreme hole. The...
Abstract The unification of quantum mechanics and general relativity has long been elusive. Only recently have empirical predictions various possible theories gravity put to test, where a clear signal properties is still missing. dawn multi-messenger high-energy astrophysics tremendously beneficial, as it allows us study particles with much higher energies travelling longer distances than in terrestrial experiments, but more progress needed on several fronts. A thorough appraisal current...
Abstract In this work, we analyze various phenomena influenced by the gravitational field in a bumblebee gravity solution, with particular emphasis on traversable wormhole for massless particle modes. Specifically, calculate index of refraction, group velocity, time delay, modified distances, and interparticle potential, demonstrating possibility photon-photon interactions due to geometry. For latter aspect, also extend analysis massive modes, resulting “combination” Yukawa- Coulomb-like...
We investigate the deflection of light by a rotating global monopole spacetime and Letelier in weak approximation. To this end, we apply Gauss-Bonnet theorem to corresponding osculating optical geometries show that increases due presence parameter string cloud parameter, respectively. The results obtained for angle equatorial plane generalize known non-rotating spacetimes as well Kerr solution.
We investigate the Hawking radiation of massive spin-1 vector particles, which are coupled to vacuum fluctuations a quantum field, from Rindler modified Schwarzschild black hole.Rindler acceleration is used produce post-general relativistic theory gravity for distant field point mass.The gravitational lensing problem hole also studied.We compute deflection angle IR region (large distance limit as infrared ) by using Gaussian curvature optical metric this back hole.Our investigations clarify...
In this paper, we analyze the deflection angle of light by Brane-Dicke wormhole in weak field limit approximation to find effect coupling parameter on gravitation lensing. For purpose, consider new geometric techniques, i.e., Gauss-Bonnet theorem and optical geometry order calculate angle. Furthermore, verify our results considering most familiar geodesic technique. Moreover, establish quantum corrected metric replacing classical with Bohmian trajectories, whose matter source anisotropic...
In this paper, we study the weak gravitational lensing in spacetime of rotating regular black hole geometries such as Ayon-Beato-Garc\'ia (ABG), Bardeen, and Hayward holes. We calculate deflection angle light using Gauss-Bonnet theorem (GBT) show that can be viewed a partially topological effect which calculated by considering domain outside ray applied to optical geometries. Then, demonstrate also via geodesics formalism for these holes verify our results explore differences with Kerr...
We present a careful study of accelerating black holes in anti-de Sitter spacetime, formulating the thermodynamics and resolving discrepancies that have appeared previous investigations topic. compute dual stress-energy tensor for spacetime identify energy density associated with static observer at infinity. The energy-momentum can be written as three-dimensional perfect fluid plus non-hydrodynamic contribution universal coefficient which is given gauge theory variables. demonstrate both...