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11 papers · 2 filters
Toward a Midisuperspace Quantization of LeMaitre-Tolman-Bondi Collapse Models
Cenalo Vaz, Louis Witten, T. P. Singh
LeMa\^ıtre-Tolman-Bondi models of spherical dust collapse have been used and continue to be used extensively to study various stellar collapse scenarios. It is by now well-known th…
Gravitational Collapse in Constant Potential Bath
S. Jhingan, N. Dadhich, P. S. Joshi
We analyse here the gravitational collapse of directed null radiation in a background with a constant potential such as one produced by a star system like galaxy in which the colla…
A Tolman-Bondi-Lemaitre Cell-Model for the Universe and Gravitational Collapse
A. Chamorro, S. S. Deshingkar, I. H. Dwivedi +1
A piecewise Tolman-Bondi-Lemaitre (TBL) cell-model for the universe incorporating local collapsing and expanding inhomogeneities is presented here. The cell-model is made up of TBL…
Gravitational Collapse and Cosmological Constant
S. S. Deshingkar, S. Jhingan, A. Chamorro +1
We consider here the effects of a non-vanishing cosmological term on the final fate of a spherical inhomogeneous collapsing dust cloud. It is shown that depending on the nature of…
The structure of non-spacelike geodesics in dust collapse
S. S. Deshingkar, P. S. Joshi
We study here the behaviour of non-spacelike geodesics in dust collapse models in order to understand the casual structure of the spacetime. The geodesic families coming out, when…
Naked singularities and quantum gravity
Tomohiro Harada, Hideo Iguchi, Ken-ichi Nakao +3
There are known models of spherical gravitational collapse in which the collapse ends in a naked shell-focusing singularity for some initial data. If a massless scalar field is qua…
Gravitational Collapse: The Story so far
Pankaj S. Joshi
An outstanding problem in gravitation theory and relativistic astrophysics today is to understand the final outcome of an endless gravitational collapse. Such a continual collapse…
Gamma-ray bursts as the birth-cries of black holes
Pankaj Joshi, Naresh Dadhich, Roy Maartens
The origin of cosmic gamma-ray bursts remains one of the most intriguing puzzles in astronomy. We suggest that purely general relativistic effects in the collapse of massive stars…
Initial data and spherical dust collapse
Filipe C. Mena, Reza Tavakol, Pankaj S. Joshi
By considering families of radial null geodesics, we study the subsets of initial data that lead to naked singularities and black holes in inhomogeneous spherical dust collapse. We…
Radiation flux and spectrum in the Vaidya collapse model
T. P. Singh, Cenalo Vaz
We consider the quantization of a massless scalar field, using the geometric optics approximation, in the background spacetime of a collapsing spherical self-similar Vaidya star, w…
Divergence of the Quantum Stress Tensor on the Cauchy Horizon in 2-d Dust Collapse
Sukratu Barve, T. P. Singh, Cenalo Vaz
We prove that the quantum stress tensor for a massless scalar field in two dimensional non-selfsimilar Tolman Bondi dust collapse and Vaidya radiation collapse models diverges on t…