43 citations · 320 across the 21 of their papers we have counts for
21 papers
Thermodynamics, Shadow, and Quasinormal Modes of AdS Ayón--Beato--García Massive Black Hole
Dharm Veer Singh, Sudhaker Upadhyay, Amit Kumar +3
We investigate the thermodynamics, photon sphere, and dynamical stability of an AdS Ayón--Beato--García (ABG) massive black hole with graviton mass and magnetic charge. The Gibbs f…
Refined Thermodynamic Analysis of Perfect Fluid Dark Matter Black Holes in a Phantom Background
Jyotish Kumar, Sudhaker Upadhyay, Himanshu Kumar Sudhanshu +2
In this study, we examine the thermodynamics of black holes immersed in perfect fluid dark matter (PFDM) by employing the Misner-Sharp energy framework. We extend the analysis to i…
Nonminimally Coupled Quintessence with Double Exponential Potential: Observational Evidence Against Big Crunch Singularity
Yerlan Myrzakulov, Saddam Hussain, Mohd Shahalam
We investigate a class of scalar field dark energy models non-minimally coupled to gravity, characterized by a double exponential potential and parameterized coupling . We study…
Modified cosmology in gravity
Y. Myrzakulov, Alnadhief H. A. Alfedeel, M. Koussour +3
In this letter, we investigate cosmology within the framework of modified gravity using the non-linear model , where , , and are…
Exploring non-perturbative effects on quasi-topological black hole thermodynamics
Vivek Kumar Srivastava, Sudhaker Upadhyay, Alok Kumar Verma +3
We examine the impact of non-perturbative quantum corrections to the entropy of both charged and charged rotating quasi-topological black holes, with a focus on their thermodynamic…
Energy conditions in gravity
Y. Myrzakulov, O. Donmez, M. Koussour +3
We are experiencing a golden age of experimental cosmology, with exact and accurate observations being used to constrain various gravitational theories like never before. Alongside…
Constraints on CDM cosmology using Cosmic Chronometers and Supernova data
Yerlan Myrzakulov, M. Koussour, M. Bulanbay +2
In this manuscript, we investigate the constraints on dynamical vacuum models within the framework of CDM cosmology by assuming a parameterization of the vacuum energy densit…
Observational constraints on freezing quintessence in a non-linear gravity
Yerlan Myrzakulov, M. Koussour, A. Caliskan +3
In this paper, we investigate the freezing quintessence scenario in late-time cosmic expansion using a non-linear gravity model, , where …
Thermodynamics of a newly constructed black hole coupled with nonlinear electrodynamics and cloud of strings
Himanshu Kumar Sudhanshu, Dharm Veer Singh, Sudhaker Upadhyay +2
This paper finds an exact singular black hole solution in the presence of nonlinear electrodynamics as the source of matter field surrounded by a cloud of strings in spa…
Signature flips in time-varying cosmological models with observational data
Yerlan Myrzakulov, M. Koussour, M. Karimov +1
In this study, we investigate signature flips within the framework of cosmological models featuring a time-varying vacuum energy term . Specifically, we consider the power-la…
Exact Solution of Bardeen Black Hole in Einstein-Gauss-Bonnet gravity
Amit Kumar, Dharm Veer Singh, Yerlan Myrzakulov +2
We have obtained a new exact regular black hole solution for the EGB gravity coupled with nonlinear electrodynamics in AdS space. The numerical analysis of horizon structure sugges…
More Exact Thermodynamics of Nonlinear Charged AdS Black Holes in 4D Critical Gravity
Prosenjit Paul, Sudhaker Upadhyay, Yerlan Myrzakulov +2
In this paper, we investigate nonlinearly charged AdS black holes in four-dimensional critical gravity and study more exact black hole thermodynamics under the effect of small stat…
Quasinormal Modes and Phase Structure of Regular Einstein-Gauss-Bonnet Black Holes
Yerlan Myrzakulov, Kairat Myrzakulov, Sudhaker Upadhyay +1
In this paper, we present an exact regular black hole solution in Einstein-Gauss-Bonnet coupled with nonlinear matter fields. It is a generalization of a regular Einstein-Gauss-Bon…
Weak Deflection Angle, Greybody Bound and Shadow for Charged Massive BTZ Black Hole
Sudhaker Upadhyay, Surajit Mandal, Yerlan Myrzakulov +1
We provide a discussion on a light ray in a charged black hole solution in massive gravity. To serve the purpose, we exploit the optical geometry of the black hole solution and fin…
Shadow of the Reissner-Nordström AdS Black Hole
Surajit Mandal, Sudhaker Upadhyay, Yerlan Myrzakulov +1
We discuss the shadow cast by the charged Reissner-Nordström (RN) AdS black hole. With the help of Killing equation and Hamilton-Jacobi equation, we calculate the geodesic equation…
Cosmic string in gravity's rainbow
Davood Momeni, Sudhaker Upadhyay, Yerlan Myrzakulov +1
In this paper, we study the various cylindrical solutions (cosmic strings) in gravity's rainbow scenario. In particular, we calculate the gravitational field equations correspondin…
Modified Chaplygin Gas and Solvable F-essence Cosmologies
Mubasher Jamil, Yerlan Myrzakulov, Olga Razina +1
The Modified Chaplygin Gas (MCG) model belongs to the class of a unified models of dark energy and dark matter. In this paper, we have modeled MCG in the framework of f-essence cos…
Dark energy in some integrable and nonintegrable FRW cosmological models
Kuralay Esmakhanova, Nurgissa Myrzakulov, Gulgasyl Nugmanova +3
One of the greatest challenges in cosmology today is to determine the nature of dark energy, the sourse of the observed present acceleration of the Universe. Besides the vacuum ene…
A note on the relationship between solutions of Einstein, Ramanujan and Chazy equations
Kuralay Esmakhanova, Yerlan Myrzakulov, Gulgasyl Nugmanova +1
The Einstein equation for the Friedmann-Robertson-Walker metric plays a fundamental role in cosmology. The direct search of the exact solutions of the Einstein equation even in thi…
G-essence cosmologies with scalar-fermion interactions
O. V. Razina, Y. M. Myrzakulov, N. S. Serikbayev +3
We study the two particular models of g-essence with Yukawa type interactions between a scalar field and a classical Dirac field . For the homogeneous, isotropic and flat Fr…
Einstein-Cartan gravity with scalar-fermion interactions
Olga Razina, Yerlan Myrzakulov, Nurzhan Serikbayev +2
In this paper, we have considered the g-essence and its particular cases, k-essence and f-essence, within the framework of the Einstein-Cartan theory. We have shown that a single f…