40 citations · 295 across the 22 of their papers we have counts for
22 papers
Non-local correlations of a test quantum field in gravitational collapse
Harkirat Singh Sahota, Suprit Singh, Ashish Pandita
Quantum correlations across the horizon could be pivotal in unveiling the puzzles surrounding quantum aspects of black holes and Hawking radiation. The peaks in the equal time corr…
Backreaction inclusive Schwinger effect in flat and de Sitter spacetimes via a self consistent Maxwell Schrodinger semiclassical dynamics
Shagun Kaushal, Suprit Singh
We employ a self consistent framework to study the backreaction effects of particle creation in the coupled semiclassical dynamics of a quantum complex scalar field and a classical…
Thermodynamics of Gravity in Local Frames
Suprit Singh
We probe the thermodynamic structure of gravity at local scales. In any general curved spacetime, it is possible to transform to a local inertial frame at any point such that the m…
Dynamics and entanglement in quantum and quantum-classical systems: lessons for gravity
Viqar Husain, Irfan Javed, Suprit Singh
Motivated by quantum gravity, semi-classical theory, and quantum theory on curved spacetimes, we study the system of an oscillator coupled to two spin-1/2 particles. This model pro…
The Life and Science of Thanu Padmanabhan
Jasjeet Singh Bagla, Krishnakanta Bhattacharya, Sumanta Chakraborty +21
Thanu Padmanabhan was a renowned Indian theoretical physicist known for his research in general relativity, cosmology, and quantum gravity. In an extraordinary career spanning fort…
Quantum backreaction on a classical universe
Viqar Husain, Suprit Singh
We study a first-order formulation for the coupled evolution of a quantum scalar field and a classical Friedmann universe. The model is defined by a state dependent hamiltonian con…
Schwinger Effect in Compact Space
Prasant Samantray, Suprit Singh
We consider a theory of scalar QED on a spatially compact 1+1-dimensional spacetime. By considering a constant electric field pointing down the compact dimension, we compute the qu…
Matter-Geometry entanglement in quantum cosmology
Viqar Husain, Suprit Singh
We present a study of the evolution of entanglement entropy of matter and geometry in quantum cosmology. For a variety of Gaussian initial states and their linear combinations, and…
Semiclassical cosmology with back reaction: the Friedmann-Schrodinger equation and inflation
Viqar Husain, Suprit Singh
We propose and study a semi-classical cosmological system akin to the Newton-Schrödinger equation where matter field evolution is determined by time dependent Schrödinger equation.…
Does quantum gravity relate the constants of nature?
Viqar Husain, Suprit Singh
The central equation of quantum gravity is the Wheeler-DeWitt equation. We give an argument suggesting that exact solutions of this equation give a surface in the space of coupling…
Schwinger Pair Production in Hot Anti-de Sitter Space
Prasant Samantray, Suprit Singh
We consider particle production in dimensional thermal Anti-de Sitter space under the influence of a constant electric field. The vacuum-persistence amplitude is given by a n…
On the Penrose inequality in anti-deSitter space
Viqar Husain, Suprit Singh
For asymptotically flat spacetimes the Penrose inequality gives an initial data test for the weak cosmic censorship hypothesis. We give a formulation of this inequality for asympto…
Multifaceted Schwinger effect in de Sitter space
Ramkishor Sharma, Suprit Singh
We investigate particle production à la Schwinger mechanism in an expanding, flat de Sitter patch as is relevant for the inflationary epoch of our universe. Defining states and par…
From Quantum to Classical in the Sky
Suprit Singh
Inflation has by-far set itself as one of the prime ideas in the current cosmological models that seemingly has an answer for every observed phenomenon in cosmology. More important…
It's a dark, dark world: Background evolution of interacting CDM models beyond simple exponential potentials
Suprit Singh, Parminder Singh
We study the background cosmological dynamics with a three component source content: a radiation fluid, a barotropic fluid to mimic the matter sector and a single scalar field whic…
A quantum peek inside the black hole event horizon
Sumanta Chakraborty, Suprit Singh, T. Padmanabhan
We solve the Klein-Gordon equation for a scalar field, in the background geometry of a dust cloud collapsing to form a black hole, everywhere in the (1+1) spacetime: that is, both…
Excavations at the gravitationally collapsed site: Recent findings
Suprit Singh
Hawking effect was dug out of the gravitationally collapsed site forty years back when it was realised that quantum effects at the horizon could propagate outward to infinity givin…
Black hole kinematics: the "in"-vacuum energy density and flux for different observers
Suprit Singh, Sumanta Chakraborty
We have investigated the local invariant scalar observables - energy density and flux - which explicitly depend on the kinematics of the concerned observers in the Vaidya gravitati…
Evolution of quantum field, particle content and classicality in the three stage universe
Suprit Singh, Sujoy Kumar Modak, T. Padmanabhan
We study the evolution of a quantum scalar field in a toy universe which has three stages of evolution, viz., (i) an early (inflationary) de Sitter phase (ii) radiation dominated p…
New perspectives on Hawking radiation
Matteo Smerlak, Suprit Singh
We develop an adiabatic formalism to study the Hawking phenomenon from the perspective of Unruh-DeWitt detectors moving along non-stationary, non-asymptotic trajectories. When appl…
Quantum field theory in de Sitter and quasi-de Sitter spacetimes: Revisited
Suprit Singh, Chandrima Ganguly, T. Padmanabhan
It is possible to associate temperatures with the non-extremal horizons of a large class of spherically symmetric spacetimes using periodicity in the Euclidean sector and this proc…
Complex Effective Path: A Semi-Classical Probe of Quantum Effects
Suprit Singh, T. Padmanabhan
We discuss the notion of an effective, average, quantum mechanical path which is a solution of the dynamical equations obtained by extremizing the quantum effective action. Since t…