12 papers
Systematic Light Propagation Bias from the Heliosphere and Its Impact on the Hubble Tension
Behnam Pourhassan, İzzet Sakallı, Sudhaker Upadhyay +1
The Hubble tension (HT) represents one of the most significant discrepancies in modern cosmology, with local distance measurements yielding km/s/Mpc while cosm…
Perturbative and Non-Perturbative Contributions to Black Hole Thermodynamics with String Clouds and Dark Matter Backgrounds
Kumar Sambhav Upadhyay, Sudhaker Upadhyay, Bhabani Prasad Mandal
We investigate the effects of perturbative and non-perturbative quantum corrections on the thermodynamics of black holes immersed in a perfect fluid dark matter (PFDM) background w…
Extended thermodynamics and Criticality of Kalb-Ramond black hole coupled with nonlinear electrodynamics
D. V. Singh, S. Upadhyay, P. Paul +1
We present an exact black hole solution in anti-de Sitter (AdS) spacetime with a Kalb-Ramond field coupled to nonlinear electrodynamics (NLED), characterized by mass, magnetic mono…
Thermodynamics, Shadow, and Quasinormal Modes of AdS Ayón--Beato--GarcÃa 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--GarcÃa (ABG) massive black hole with graviton mass and magnetic charge. The Gibbs…
More Exact Thermodynamic Analysis of Topological Black Holes in Gravity
Sudhaker Upadhyay, Jyotish Kumar, Dharm Veer Singh +3
This study investigates the thermodynamics of topological black hole solutions in gravity, incorporating the effects of small statistical fluctuations up to first-order cor…
Holography and the Swampland: Constraints on Quantum Gravity from Holographic Principles
Sudhaker Upadhyay, Alexander Reshetnyak, Pavel Moshin +1
The Swampland Program aims to delineate the space of consistent low-energy effective field theories (EFTs) that admit a UV completion in quantum gravity from those that do not. In…