52 citations · 257 across the 23 of their papers we have counts for
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Twin-paradox and Entanglement
K. Hari, Subhajit Barman, Dawood Kothawala
We study the quantum version of the classical twin paradox in special relativity by replacing the twins with quantum detectors, and studying the transitions and entanglement induce…
Radiative process of tripartite entangled probes in inertial motion
Subhajit Barman, K. Hari
We study the radiative process of three entangled quantum probes initially prepared in a tripartite W state. As a basic set-up, we consider the probes to be inertial in flat spacet…
Entanglement between accelerated probes in a de Sitter spacetime
Mayank, K. Hari, Subhajit Barman +1
We initiate an investigation into features of vacuum entanglement as probed by accelerated quantum probes in curved spacetime. Focussing specifically on de Sitter (dS) spacetime wi…
Equivalence in virtual transitions between uniformly accelerated and static atoms: from a bird's eye
Pradeep Kumar Kumawat, Subhajit Barman, Bibhas Ranjan Majhi
We study the prospect of the equivalence principle at the quantum regime by investigating the transition probabilities of a two-level atomic detector in different scenarios. In par…
Pure Gauss-Bonnet NUT Black Hole Solution: II
Sajal Mukherjee, Subhajit Barman
In the present article, we have obtained an exact analytical solution of six-dimensional pure Gauss-Bonnet gravity in the presence of both NUT and Maxwell charges. The topology of…
Timelike transitions in an atom by a mirror in light cone and Kruskal-Szekeres regions: a status of quantum equivalence
Subhajit Barman, Pradeep Kumar Kumawat, Bibhas Ranjan Majhi
We investigate the timelike transitions in a two-level atom in the presence of an infinite reflecting mirror in the future-past light cone regions of a Minkowski spacetime, as well…
Signatures of gravitational wave memory in the radiative process of entangled quantum probes
Subhajit Barman, Indranil Chakraborty, Sajal Mukherjee
In this article, we examine entangled quantum probes in geodesic trajectories in a flat background with a gravitational wave (GW) burst. In particular, these quantum probes are pre…
Universal role of curvature in vacuum entanglement
Hari K, Subhajit Barman, Dawood Kothawala
We highlight some universal features concerning the role of spacetime curvature in the entanglement induced between quantum probes coupled to a quantum field in a suitable vacuum s…
Entanglement harvesting for different gravitational wave burst profiles with and without memory
Subhajit Barman, Indranil Chakraborty, Sajal Mukherjee
In the present article, we study how different gravitational wave (GW) burst profiles in linearized gravity, with and without the asymptotic memory, may influence the harvesting be…
Optimization of entanglement depends on whether a black hole is extremal
Subhajit Barman, Bibhas Ranjan Majhi
We consider two Unruh-DeWitt detectors interacting with a massless, minimally coupled scalar field in a dimensional Reissner-Nordström black hole spacetime. In particular,…
Entanglement harvesting between two inertial Unruh-DeWitt detectors from non-vacuum quantum fluctuations
Dipankar Barman, Subhajit Barman, Bibhas Ranjan Majhi
Entanglement harvesting from the quantum field is a well-known fact that, in recent times, is being rigorously investigated further in flat and different curved backgrounds. The us…
Radiative processes of single and entangled detectors on circular trajectories in (2+1) dimensional Minkowski spacetime
Subhajit Barman, Bibhas Ranjan Majhi, L. Sriramkumar
We investigate the radiative processes involving two entangled Unruh-DeWitt detectors that are moving on circular trajectories in -dimensional Minkowski spacetime. We assume…
Entanglement harvesting from conformal vacuums between two Unruh-DeWitt detectors moving along null paths
Subhajit Barman, Dipankar Barman, Bibhas Ranjan Majhi
It is well-known that the dimensional Schwarzschild and spatially flat FLRW spacetimes are conformally flat. This work examines entanglement harvesting from the conformal f…
Hawking effect in an extremal Kerr black hole spacetime
Saumya Ghosh, Subhajit Barman
It is well known that extremal black holes do not Hawking radiate, which is usually realized by taking an extremal limit from the nonextremal case. However, one cannot perceive the…
Role of thermal field in entanglement harvesting between two accelerated Unruh-DeWitt detectors
Dipankar Barman, Subhajit Barman, Bibhas Ranjan Majhi
We investigate the effects of field temperature on the entanglement harvesting between two uniformly accelerated detectors. For their parallel motion, the thermal nature…
Radiative process of two entangled uniformly accelerated atoms in a thermal bath: a possible case of anti-Unruh event
Subhajit Barman, Bibhas Ranjan Majhi
We study the radiative process of two entangled two-level atoms uniformly accelerated in a thermal bath, coupled to a massless scalar field. First, using the positive frequency Wig…
Thermal behavior of a radially deformed black hole spacetime
Subhajit Barman, Sajal Mukherjee
In the present article, we study the Hawking effect and the bounds on greybody factor in a spacetime with radial deformation. This deformation is expected to carry the imprint of a…
The Hawking effect and the bounds on greybody factor for higher dimensional Schwarzschild black holes
Subhajit Barman
In this work, we have considered a dimensional Schwarzschild-Tangherlini black hole spacetime with massless minimally coupled free scalar fields in its bulk and brane. The…
Perturbative approach to the entanglement entropy and the area law in Fock and polymer quantization
Subhajit Barman, Gopal Sardar
The area dependence of entanglement entropy of a free scalar field is often understood in terms of coupled harmonic oscillators. In Schrodinger quantization, the Gaussian nature of…
Consistent derivation of the Hawking effect for both non-extremal and extremal Kerr black holes
Subhajit Barman, Golam Mortuza Hossain
It is believed that extremal black holes do not emit Hawking radiation as understood by taking extremal limits of non-extremal black holes. However, it is debated whether one can m…
An exact derivation of the Hawking effect in canonical formulation
Subhajit Barman, Golam Mortuza Hossain, Chiranjeeb Singha
The Hawking effect is one of the most extensively studied topics in modern physics. Yet it remains relatively under-explored within the framework of canonical quantization. The key…
The Hawking effect is short-lived in polymer quantization
Subhajit Barman, Golam Mortuza Hossain, Chiranjeeb Singha
It is widely believed that the Hawking effect might hold clues to the possible, yet unknown, trans-Planckian physics. On the other hand, one could ask whether the effect itself mig…