203 citations · 3.4k across the 107 of their papers we have counts for
11 papers · 1 filter
Microscopic origin of Einstein's field equations and the raison d'être for a positive cosmological constant
T. Padmanabhan, Sumanta Chakraborty
In the paradigm of effective field theory, one hierarchically obtains the effective action for some low(er) energy degrees of freedom , by int…
Bound on photon circular orbits in general relativity and beyond
Sumanta Chakraborty
Existence of a photon circular orbit can tell us a lot about the nature of the underlying spacetime, since it plays a pivotal role in the understanding of the characteristic signat…
Supertranslations at Timelike Infinity
Sumanta Chakraborty, Debodirna Ghosh, Sk Jahanur Hoque +2
We propose a definition of asymptotic flatness at timelike infinity in four spacetime dimensions. We present a detailed study of the asymptotic equations of motion and the action o…
Weiss variation for general boundaries
Justin C. Feng, Sumanta Chakraborty
The Weiss variation of the Einstein-Hilbert action with an appropriate boundary term has been studied for general boundary surfaces; the boundary surfaces can be spacelike, timelik…
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…
Bouncing with shear: Implications from quantum cosmology
Karthik Rajeev, Vikramaditya Mondal, Sumanta Chakraborty
We consider the introduction of anisotropy in a class of bouncing models of cosmology. The presence of anisotropy often spells doom on bouncing models, since the energy density due…
Constraining extra dimensions using observations of black hole quasi-normal modes
Akash K Mishra, Abhirup Ghosh, Sumanta Chakraborty
The presence of extra dimensions generically modify the spacetime geometry of a rotating black hole, by adding an additional hair, besides the mass and the angular momentum …
Gravitational multipole moments for asymptotically de Sitter spacetimes
Sumanta Chakraborty, Sk Jahanur Hoque, Roberto Oliveri
We provide a prescription to compute the gravitational multipole moments of compact objects for asymptotically de Sitter spacetimes. Our prescription builds upon a recent definitio…
Looking for extra dimensions in the observed quasi-periodic oscillations of black holes
Indrani Banerjee, Sumanta Chakraborty, Soumitra SenGupta
Quasi-periodic oscillations, often present in the power density spectrum of accretion disk around black holes, are useful probes for the understanding of gravitational interaction…
Tidal heating of black holes and exotic compact objects on the brane
Sumanta Chakraborty, Sayak Datta, Subhadip Sau
During the early phase of in-spiral of a binary system, the tidal heating of a compact object due to its companion plays a significant role in the determination of the orbital evol…
No-boundary Wave Function, Wheeler-DeWitt Equation and Path Integral Analysis of the Bouncing `Quantum' Cosmology
Karthik Rajeev, Vikramaditya Mondal, Sumanta Chakraborty
Bouncing models are alternatives to inflationary cosmology that replace the initial Big-Bang singularity by a `bouncing' phase. A deeper understanding of the initial conditions of…