131 citations · 406 across the 12 of their papers we have counts for
12 papers
Asymptotic Symmetries at Spatial Infinity
Sharad Mishra, Kinjal Banerjee, Jishnu Bhattacharyya
We describe asymptotic symmetries at spatial infinity of asymptotically flat spacetimes within the context of a generalization of the Beig-Schmidt-Ashtekar-Romano-framework. We dem…
de Sitterization via Kerr-Schild
Aditya Sharma, Kinjal Banerjee, Jishnu Bhattacharyya
Spatially homogeneous cosmological spacetimes, evolving in the presence of a positive cosmological constant and matter satisfying some reasonable energy conditions, typically appro…
Dynamical obstruction to perpetual motion from Lorentz-violating black holes
Robert Benkel, Jishnu Bhattacharyya, Jorma Louko +2
Black holes in Lorentz-violating theories have been claimed to violate the second law of thermodynamics by perpetual motion energy extraction. We revisit this question for a Penros…
Simulating coronal loop implosion and compressible wave modes in a flare hit active region
Aveek Sarkar, Bhargav Vaidya, Soumitra Hazra +1
There is considerable observational evidence of implosion of magnetic loop systems inside solar coronal active regions following high energy events like solar flares. In this work,…
Revisiting the cuscuton as a Lorentz-violating gravity theory
Jishnu Bhattacharyya, Andrew Coates, Mattia Colombo +2
The cuscuton is a scalar field with infinite speed of propagation. It was introduced in the context of cosmology but it has also been claimed to resemble Horava gravity in a certai…
Asymptotically Lifshitz spacetimes with universal horizons in dimensions
Sayandeb Basu, Jishnu Bhattacharyya, David Mattingly +1
Horava gravity theory possesses global Lifshitz space as a solution and has been conjectured to provide a natural framework for Lifshitz holography. We derive the conditions on the…
Evolution and spherical collapse in Einstein-aether theory and Horava gravity
Jishnu Bhattacharyya, Andrew Coates, Mattia Colombo +1
We compare the initial value formulation of the low-energy limit of (non-projectable) Horava gravity to that of Einstein-aether theory when the aether is assumed to be hypersurface…
Causality and black holes in spacetimes with a preferred foliation
Jishnu Bhattacharyya, Mattia Colombo, Thomas P. Sotiriou
We develop a framework that facilitates the study of the causal structure of spacetimes with a causally preferred foliation. Such spacetimes may arise as solutions of Lorentz-viola…
Universal horizons in maximally symmetric spaces
Jishnu Bhattacharyya, David Mattingly
Universal horizons in Hořava-Lifshitz gravity and Einstein-æther theory are the equivalent of causal horizons in general relativity and appear to have many of the same properties,…
Towards thermodynamics of universal horizons in Einstein-æther theory
Per Berglund, Jishnu Bhattacharyya, David Mattingly
Holography grew out of black hole thermodynamics, which relies on the causal structure and general covariance of general relativity. In Einstein-æther theory, a generally covariant…
Mechanics of universal horizons
Per Berglund, Jishnu Bhattacharyya, David Mattingly
Modified gravity models such as Hořava-Lifshitz gravity or Einstein-æther theory violate local Lorentz invariance and therefore destroy the notion of a universal light cone. Despit…
Charged Dilatonic AdS Black Branes in Arbitrary Dimensions
Per Berglund, Jishnu Bhattacharyya, David Mattingly
We study electromagnetically charged dilatonic black brane solutions in arbitrary dimensions with flat transverse spaces, that are asymptotically AdS. This class of solutions inclu…