14 citations · 91 across the 22 of their papers we have counts for
21 papers · 1 filter
Temperature Fluctuations and quantum corrections near Black Hole Horizon
Anamika Avinash Pathak, Swastik Bhattacharya
Spatially varying near-horizon fluctuations of temperature of a Schwarzschild Black Hole is considered within the Euclidean Gravity approach. We present evidence that suggests that…
Complexity Growth in Black Holes: A Comparison of the Volume and Action Proposals
Suraj Maurya, Sashideep Gutti, Rahul Nigam +1
In this article, we investigate the late-time growth of holographic complexity, defined via the complexity-volume (CV) and complexity-action (CA) prescriptions, for BTZ, Schwarzsch…
Surface Gravity of Dynamical Horizons: A Causal Perspective
Anamika Avinash Pathak, Konka Raviteja, Swastik Bhattacharya +1
We consider marginally trapped surfaces in a spherically symmetric spacetime evolving due to the presence of a perfect fluid in D-dimensions and look at the various definitions of…
Effective field theory description of horizon-fluid determines the scrambling time
Swastik Bhattacharya, S. Shankaranarayanan
Black hole horizons interact with external fields when matter-energy falls through them. Such non-stationary black hole horizons can be described using viscous fluid equations. Thi…
Microscopic Model building for Black Hole Membranes from Constraints of Symmetry
Swastik Bhattacharya, S. Shankaranarayanan
Einstein equations projected on black-hole horizons give rise to the equations of motion of a viscous fluid. This suggests a way to understand the microscopic degrees of freedom on…
Is there an upper bound on the size of a black-hole?
Swastik Bhattacharya, S. Shankaranarayanan
According to the third law of Thermodynamics, it takes an infinite number of steps for any object, including black-holes, to reach zero temperature. For any physical system, the pr…
Black-hole event horizons-Teleology and Predictivity
Swastik Bhattacharya, S. Shankaranarayanan
General Relativity predicts the existence of black-holes. Access to the complete space-time manifold is required to describe the black-hole. This feature necessitates that black-ho…
Negative specific heat of black-holes from Fluid-Gravity Correspondence
Swastik Bhattacharya, S. Shankaranarayanan
Black-holes in asymptotically flat space-times have negative specific heat --- they get hotter as they loose energy. A clear statistical mechanical understanding of this has remain…
Hints of quantum gravity from the horizon fluid
Bethan Cropp, Swastik Bhattacharya, S. Shankaranarayanan
For many years researchers have tried to glean hints about quantum gravity from black hole thermodynamics. However, black hole thermodynamics suffers from the problem of Universali…
Statistical modeling of the fluid dual to Boulware-Deser Black hole
J. L. López, Swastik Bhattacharya, S. Shankaranarayanan
In this work we study the statistical and thermodynamic properties of the horizon fluid corresponding to the Boulware-Deser (BD) black hole of Einstein-Gauss-Bonnet (EGB) gravity.…
Fluctuations in horizon-fluid lead to negative bulk viscosity
Swastik Bhattacharya, S. Shankaranarayanan
Einstein equations projected on to a black hole horizon gives rise to Navier-Stokes equations. Horizon-fluids typically possess unusual features like negative bulk viscosity and it…
How Emergent is Gravity?
Swastik Bhattacharya, S. Shankaranarayanan
General theory of relativity (or Lovelock extensions) is a dynamical theory; given an initial configuration on a space-like hypersurface, it makes a definite prediction of the fina…
A new proposal regarding the heat generated by gravity in locally accelerating frames
Swastik Bhattacharya
For Rindler observers accelerating close to the horizon in local patches around a spacetime point, the matter-energy passing through the horizon increases the entropy and heat ener…
The issue of zeroth law for Killing horizons in Lanczos-Lovelock gravity
Sudipta Sarkar, Swastik Bhattacharya
We study the zeroth law for Killing horizons in Lanczos-Lovelock gravity. We show that the surface gravity of a general Killing horizon in Lanczos-Lovelock gravity (except for gene…
Singular and non-singular endstates in massless scalar field collapse
Swastik Bhattacharya
We study the collapse of a massless scalar field coupled to gravity. A class of blackhole solutions are identified. We also report on a class of solutions where collapse starts fro…
Collapse and dispersal in massless scalar field models
Swastik Bhattacharya, Rituparno Goswami, Pankaj S. Joshi
The phenomena of collapse and dispersal for a massless scalar field has drawn considerable interest in recent years, mainly from a numerical perspective. We give here a sufficient…
Trapped surfaces and horizons in static massless scalar field spacetimes
Swastik Bhattacharya, Pankaj S. Joshi
We consider here the existence and structure of trapped surfaces, horizons and singularities in spherically symmetric static massless scalar field spacetimes. Earlier studies have…
Regularity of initial data in dynamical massless scalar field models
Swastik Bhattacharya, Pankaj S. Joshi
We discuss here the issue of regularity of initial data for dynamical spherically symmetric massless scalar field models in a spacetime. Generalizing the known solutions of Einstei…
Static spherically symmetric scalar field spacetimes with C^0 matching
Swastik Bhattacharya, Pankaj S. Joshi
All the classes of static massless scalar field models available currently in the Einstein theory of gravity necessarily contain a strong curvature naked singularity. We obtain her…
Accelerated cosmic expansion in a scalar-field universe
Swastik Bhattacharya, Pankaj S. Joshi, Ken-ichi Nakao
We consider here a spherically symmetric but inhomogeneous universe filled with a massless scalar field. The model obeys two constraints. The first one is that the gradient of the…
Gravitational collapse of a minimally coupled massless scalar field
Swastik Bhattacharya, Rituparno Goswami, Pankaj S. Joshi
We study here the evolution of a massless scalar field in a spacetime, developing from a regular initial spacelike surface. The Einstein equations and regularity and boundary condi…