54 citations · 380 across the 32 of their papers we have counts for
33 papers
Hawking-Page phase transition for pure Lovelock black holes
Nitesh K. Dubey, Sanved Kolekar
We investigate the thermodynamic properties of static, spherically symmetric Anti-de Sitter (AdS) black holes, focusing on the interplay between characteristic temperatures, as wel…
Time delay as a probe of multiple photon spheres
Kajol Paithankar, Sanved Kolekar
Black hole shadow images are primarily determined by the properties of photon spheres and can exhibit degeneracies across different spherically symmetric spacetime geometries. We s…
Stationary Stars Are Axisymmetric in Higher Curvature Gravity
Nitesh K. Dubey, Sanved Kolekar, Sudipta Sarkar
The final equilibrium stage of stellar evolution can result in either a black hole or a compact object such as a white dwarf or neutron star. In general relativity, both stationary…
Kinematics of Acceleration-Induced Excitations in Confined Quantum Fields
Hemansh Shah, Sanved Kolekar
We investigate quantum field excitations in a rigid cavity that undergoes a transition from inertial motion to uniform acceleration while maintaining constant proper length. By con…
Quantum Field Theory in Successive Rindler Spacetimes
Nitesh K. Dubey, Jaswanth Uppalapati, Sanved Kolekar
We study successive Rindler-like transformations in Minkowski spacetime and the corresponding sequence of vacuum states perceived by observers restricted to respective wedges. Exte…
Memory Effects and Entanglement Dynamics of Finite time Acceleration
Nitesh K. Dubey, Sanved Kolekar
We construct a smooth trajectory in Minkowski spacetime that is inertial in the asymptotic past and future but undergoes approximately uniform acceleration for a finite duration. I…
Isentropic processes for axisymmetric Black Holes
Nitesh K. Dubey, Sanved Kolekar
We demonstrate that the isentropic absorption of a classical charged test particle is classically forbidden for all 3+1 dimensional stationary, non-extremal, axisymmetric black hol…
Probing Generalized Emergent Dark Energy with DESI DR2
Vipin kumar Sharma, Himanshu Chaudhary, Sanved Kolekar
As an update on the initial findings of DESI, the new results provide the first hint of potential deviations from a cosmological constant (), which, if confirmed with signifi…
Harvesting Fermionic Field Entanglement in Schwarzschild Spacetime
Nitesh Kumar Dubey, Sanved Kolekar
We explore entanglement harvesting using two Unruh-DeWitt (UDW) detectors linearly coupled to the scalar density of a massless spin-1/2 field in 1+1 Schwarzschild spacetime. We con…
Gravitational physics in the context of Indian astronomy: A vision document
P. Ajith, K. G. Arun, Sukanta Bose +13
Contributions from the Indian gravity community have played a significant role in shaping several branches of astronomy and astrophysics. This document reviews some of the most imp…
Photon region boundary for stationary axisymmetric black holes
Prasad Padhye, Kajol Paithankar, Sanved Kolekar
The black hole shadow is fundamentally connected to the structure of light rings and the photon region in the background geometry. We investigate the photon region boundary in a ge…
Wigner distributions in Rindler spacetime and nonvacuum Minkowski states
Nitesh K. Dubey, Sanved Kolekar
In the 1970s, Fulling, Davies, and Unruh demonstrated that the vacuum state perceived by an inertial observer in Minkowski space appears as a thermal bath to a uniformly accelerate…
Black hole shadow and acceleration bounds for spherically symmetric spacetimes
Kajol Paithankar, Sanved Kolekar
We explore an interesting connection between black hole shadow parameters and the acceleration bounds for radial linear uniformly accelerated (LUA) trajectories in static spherical…
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…
Can a localised quantum system see soft photons?
Sanved Kolekar, Jorma Louko
We ask whether soft photons, defined by asymptotic charges, can have consequences for the outcome of localised quantum processes. We consider a spatially localised two-state system…
The role of Unruh effect in Bremsstrahlung
Kajol Paithankar, Sanved Kolekar
An equivalence is demonstrated, by an explicit first order quantum calculation, between the Minkowski photon emission rate in the inertial frame for an accelerating charge moving o…
Generation of CMB and Cosmological constant via bulk viscosity
Sanved Kolekar, S. Shankaranarayanan, S. M. Chitre
A simple model of uniformly expanding, homogeneous Universe with a bulk viscosity is studied wherein the inflationary density decays due to viscous dissipation during the expansion…
Directional dependence of the Unruh effect for spatially extended detectors
Sanved Kolekar
We analyse the response of a spatially extended direction-dependent local quantum system, a detector, moving on the Rindler trajectory of uniform linear acceleration in Minkowski s…
Rindler horizons in the Schwarzschild spacetime
Kajol Paithankar, Sanved Kolekar
We investigate the past and future Rindler horizons for radial Rindler trajectories in the Schwarzschild spacetime. We assume the Rindler trajectory to be linearly uniformly accele…
Bound on Rindler trajectories in Black Hole spacetime
Kajol Paithankar, Sanved Kolekar
We investigate radial Rindler trajectories in a static spherically symmetric black hole spacetime. We assume the trajectory to remain linearly uniformly accelerated throughout its…
Quantum memory for Rindler supertranslations
Sanved Kolekar, Jorma Louko
The Rindler horizon in Minkowski spacetime can be implanted with supertranslation hair by a matter shock wave without planar symmetry, and the hair is observable as a supertranslat…
Gravitational memory for uniformly accelerated observers
Sanved Kolekar, Jorma Louko
Recently, Hawking, Perry and Strominger described a physical process that implants supertranslational hair on a Schwarzschild black hole by an infalling matter shock wave without s…
Uniformly accelerated observer in a thermal bath
Sanved Kolekar
We investigate the quantum field aspects in flat spacetime for an uniformly accelerated observer moving in a thermal bath. In particular, we obtain an exact closed expression of th…
Quantum field theory in the Rindler-Rindler spacetime
Sanved Kolekar, T. Padmanabhan
It is well known that Minkowski vacuum appears as a thermal bath in the Rindler spacetime when the modes on the left wedge are traced out. We introduce the concept of a Rindler-Rin…