119 citations · 436 across the 31 of their papers we have counts for
14 papers · 1 filter
Counting the Apparent Horizon
Arundhati Dasgupta
Using a discrete spectrum proposed for expectation values of canonical variables in black hole coherent states, the semiclassical entropy associated with the Schwarzschild space-ti…
Coherent States for Black Holes
Arundhati Dasgupta
We determine coherent states peaked at classical space-time of the Schwarzschild black hole in the frame-work of canonical quantisation of general relativity. The information about…
The Real Wick Rotations in Quantum Gravity
Arundhati Dasgupta
We discuss Wick rotations in the context of gravity, with emphasis on a non-perturbative Wick rotation proposed in hep-th/0103186 mapping real Lorentzian metrics to real Euclidean…
An Introduction to the Quantum Supermembrane
Arundhati Dasgupta, Hermann Nicolai, Jan Plefka
We review aspects of quantisation of the 11-dimensional supermembrane world volume theory. We explicitly construct vertex operators for the massless states and study interactions o…
A Lorentzian cure for Euclidean troubles
J. Ambjorn, A. Dasgupta, J. Jurkiewicz +1
There is strong evidence coming from Lorentzian dynamical triangulations that the unboundedness of the gravitational action is no obstacle to the construction of a well-defined non…
A proper-time cure for the conformal sickness in quantum gravity
A. Dasgupta, R. Loll
Starting from the space of Lorentzian metrics, we examine the full gravitational path integral in 3 and 4 space-time dimensions. Inspired by recent results obtained in a regularize…
Vertex Operators for the Supermembrane
Arundhati Dasgupta, Hermann Nicolai, Jan Plefka
We derive the vertex operators that are expected to govern the emission of the massless d=11 supermultiplet from the supermembrane in the light cone gauge. We demonstrate that they…
Black Hole Emission Rates and the AdS/CFT Correspondence
Saurya Das, Arundhati Dasgupta
We study the emission rates of scalar, spinor and vector particles from a 5 dimensional black hole for arbitrary partial waves. The solution is lifted to 6 dimensions, and the near…
Emission of Fermions from BTZ Black Holes
Arundhati Dasgupta
The emission rate of fermions from 2+1 dimensional BTZ black holes is shown to have a form which can be reproduced from a conformal field theory at finite temperature. The rate obt…
Planckian Scattering of D-Branes
Saurya Das, Arundhati Dasgupta, P. Ramadevi +1
We consider the gravitational scattering of point particles in four dimensions, at Planckian centre of mass energy and low momentum transfer, or the eikonal approximation. The scat…
Black hole fermionic radiance and D brane decay
Saurya Das, Arundhati Dasgupta, Parthasarathi Majumdar +1
The semiclassical grey-body factor for massless fermion emission from the four dimensional black hole described by an ensemble of intersecting triplets of D- five-branes is shown t…
High Energy Effects on D-Brane and Black Hole Emission Rates
Saurya Das, Arundhati Dasgupta, Tapobrata Sarkar
We study the emission of scalar particles from a class of near-extremal five dimensional black holes and the corresponding D-brane configuration at high energies. We show that the…
Fermions in Black Hole Space-Time: Hawking Radiation and Back Reaction
Arundhati Dasgupta, Parthasarathi Majumdar
The leading order correction to the metric of a Schwarzschild black hole, due to the backreaction of infalling fermionic matter fields, is shown to produce a shift of the event hor…
Can Extremal Black Holes Have Non-Zero Entropy ?
Saurya Das, Arundhati Dasgupta, P. Ramadevi
We give several pieces of evidence to show that extremal black holes cannot be obtained as limits of non-extremal black holes. We review arguments in the literature showing that th…