Malay K. Nandy

Quantum Cosmology in Page-Wootters' Framework: Singularity Resolution and Clock Coherence

Vishal, Malay K. Nandy

We investigate the fate of big-bang singularity and coherence between distinct clock states in a quantum cosmological setting within the Page-Wootters framework. With a canonically…

Probing the Black Hole Singularity with a Quantum String

Harpreet Singh, Malay K. Nandy

In this paper, we investigate the quantum behaviour near the classical singularity of a black hole. We describe the black-hole interior by the Kantowski-Sachs metric, with a string…

Graceful Exit to Radiation Domination in the Starobinsky Model: A Dynamical Realization

Bhargabi Saha, Malay K. Nandy

The Starobinsky model provides a successful realization of inflation and serves as a benchmark for alternative inflationary models. Motivated by its observational success, we inves…

Dynamical Selection of Horizon-BMS Goldstone Modes in Evaporating Black Holes

Nihar Ranjan Ghosh, Malay K. Nandy

We investigate the dynamics of horizon soft degrees of freedom associated with near-horizon BMS supertranslations in an evaporating Vaidya-Schwarzschild black hole spacetime. Consi…

Near-Horizon BMS Symmetry and Implications on Black Hole Entropy

Nihar Ranjan Ghosh, Malay K. Nandy

Thermodynamic significance of near-horizon symmetries remains an important open question in black hole physics, particularly in the context of black hole evaporation and informatio…

Dynamical Baryogenesis in Rainbow Cosmology

Surendra Kumar Gour, Malay K. Nandy

We investigate baryogenesis in the framework of rainbow cosmology employing a complex scalar field with a softly broken global $U (1)$ -symmetry. The modified dispersion relation of…

Singularity Resolution in Quantum Cosmology via Page-Wootters Formalism

Vishal, Malay K. Nandy

We investigate the problem of classical big bang singularity in a plane-symmetric Bianchi type-I universe within the Wheeler-DeWitt (WDW) framework of quantum gravity. To address t…

Non-Supersymmetric Baryogenesis from $U (1)$ -Breaking Scalar Dynamics

Surendra Kumar Gour, Malay K. Nandy

We present a non-supersymmetric mechanism for baryogenesis driven by the nonlinear dynamics of a complex scalar field with generalized self-interaction potentials that explicitly b…

BMS transformed Quantum String Dynamics near a Black Hole

Nihar Ranjan Ghosh, Malay K. Nandy

Asymptotic symmetries are expected to leave subtle but physically meaningful imprints on quantum probes of gravity, yet their manifestation in near-horizon dynamics remains incompl…

Bohmian singularity resolution and quantum relaxation in Bianchi type-I quantum cosmology

Vishal, Malay K. Nandy

We investigate cosmological singularity resolution and relaxation dynamics within the Bohmian mechanics via the plane-symmetric Bianchi type-I minisuperspace model in the Wheeler-D…

Constraints on BMS Transformations via Energy Conditions and implications on black hole geometry

Nihar Ranjan Ghosh, Malay K. Nandy

We investigate whether the formally infinite-dimensional supertranslation sector of the Bondi-Metzner-Sachs (BMS) group remains fully physically admissible once classical energy co…

Dynamical Evolution and Graceful Exit in Quartic Warm Inflation

Bhargabi Saha, Malay K. Nandy

In this study, we investigate the full nonlinear dynamics of warm inflation driven by the quartic inflaton potential, avoiding any simplifying approximations. The thermal backreact…

Asymptotic Generation of Kerr Geometry from Schwarzschild via BMS Supertranslations

Nihar Ranjan Ghosh, Malay K. Nandy

The Bondi-van der Burg-Metzner-Sachs (BMS) group, as the asymptotic symmetry group of asymptotically flat spacetimes, plays a central role in connecting infrared structures of grav…

Trapped string states in AdS $_{5}$ black hole geometry: A path toward Hawking radiation

Harpreet Singh, Malay K. Nandy

We investigate the quantum dynamics of a closed bosonic string in the curved spacetime of an AdS $_{5}$ -Schwarzschild black hole. Starting from the Polyakov action, we perform a canon…

Geodesically Complete Regularized Schwarzschild Black Holes

Nihar Ranjan Ghosh, Malay K. Nandy

Classical general relativity predicts a singularity at the center of a black hole, where known laws of physics break down. This suggests the existence of deeper, yet unknown princi…

Nonlinear Dynamics of the Inner Horizon in Reissner-Nordström Black Holes: Insights into Mass Inflation

Nihar Ranjan Ghosh, Malay K. Nandy

The well-known instability of the inner horizon of a Reissner-Nordström black hole, first suggested by Simpson and Penrose, although studied extensively, has remained illusive so f…

Charged black holes in Eddington-inspired Born-Infeld gravity: An in-depth analysis of the structure of spacetime geometry

Muhammed Shafeeque, Malay K. Nandy

In this paper, we focus upon the behaviour of spacetime of charged black holes described by Eddington-inspired Born-Infeld (EiBI) gravity. With a static and spherically symmetric m…

Stability of charged scalar hair on a Reissner-Nordström black hole

Muhammed Shafeeque, Malay K. Nandy

The Israel-Carter theorem (also known as the "no-hair theorem") puts a restriction on the existence of parameters other than mass, electric charge, and angular momentum of a black…

Emergent spin and clock variable in Bianchi type-I quantum cosmology

Vishal, Malay K. Nandy

We consider the Bianchi type-I model of the universe in the Wheeler-DeWitt quantization scheme with the matter degree of freedom represented by a scalar field. As a consequence, th…