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14 papers · 2 filters
Mass Spectrum and Statistical Entropy of the BTZ black hole from Canonical Quantum Gravity
Cenalo Vaz, Sashideep Gutti, Claus Kiefer +2
In a recent publication we developed a canonical quantization program describing the gravitational collapse of a spherical dust cloud in 2+1 dimensions with a negative cosmological…
Classical and Quantum Gravitational Collapse in d-dim AdS Spacetime I. Classical Solutions
Rakesh Tibrewala, Sashideep Gutti, T. P. Singh +1
We study the collapse of a spherically symmetric dust distribution in -dimensional AdS spacetime. We investigate the role of dimensionality, and the presence of a negative cosmo…
Quantum measurement and quantum gravity : many-worlds or collapse of the wave-function?
T. P. Singh
At present, there are two possible, and equally plausible, explanations for the physics of quantum measurement. The first explanation, known as the many-worlds interpretation, does…
On trapped surface formation in gravitational collapse II
Pankaj S. Joshi, Rituparno Goswami
Further to our consideration on trapped surfaces in gravitational collapse, where pressures were allowed to be negative while satisfying weak energy condition to avoid trapped surf…
Critical Collapse of Einstein Cluster
Ashutosh Mahajan, Tomohiro Harada, Pankaj S. Joshi +1
We observe critical phenomena in spherically symmetric gravitational collapse of Einstein Cluster. We show analytically that the collapse evolution ends either in formation of a bl…
Quantum Gravitational Collapse and Hawking Radiation in 2+1 Dimensions
Cenalo Vaz, Sashideep Gutti, Claus Kiefer +1
We develop the canonical theory of gravitational collapse in 2+1 dimensions with a negative cosmological constant and obtain exact solutions of the Wheeler--DeWitt equation regular…
Analytical solutions for black-hole critical behaviour
Tomohiro Harada, Ashutosh Mahajan
Dynamical Einstein cluster is a spherical self-gravitating system of counterrotating particles, which may expand, oscillate and collapse. This system exhibits critical behaviour in…
A Covariant Road to Spatial Averaging in Cosmology : Scalar Corrections to the Cosmological Equations
Aseem Paranjape
A consistent approach to Cosmology requires an explicit averaging of the Einstein equations, to describe a homogeneous and isotropic geometry. Such an averaging will in general mod…
The inevitable nonlinearity of quantum gravity falsifies the many-worlds interpretation of quantum mechanics
T. P. Singh
There are fundamental reasons as to why there should exist a reformulation of quantum mechanics which does not refer to a classical spacetime manifold. It follows as a consequence…
Particle creation in (2+1) circular dust collapse
Sashideep Gutti, T. P. Singh
We investigate the quantum particle creation during the circularly symmetric collapse of a 2+1 dust cloud, for the cases when the cosmological constant is either zero or negative.…
The Spatial Averaging Limit of Covariant Macroscopic Gravity - Scalar Corrections to the Cosmological Equations
Aseem Paranjape, T. P. Singh
It is known that any explicit averaging scheme of the type essential for describing the large scale behaviour of the Universe, must necessarily yield corrections to the Einstein eq…
Hawking radiation from the quantum Lemaitre-Tolman-Bondi model
C. Kiefer, J. Mueller-Hill, T. P. Singh +1
In an earlier paper, we obtained exact solutions of the Wheeler-DeWitt equation for the Lemaitre-Tolman-Bondi (LTB) model of gravitational collapse, employing a lattice regularizat…
On the genericity of spacetime singularities
Pankaj S. Joshi
We consider here the genericity aspects of spacetime singularities that occur in cosmology and in gravitational collapse. The singularity theorems (that predict the occurrence of s…
Entropy of Null Surfaces and Dynamics of Spacetime
T. Padmanabhan, Aseem Paranjape
The null surfaces of a spacetime act as one-way membranes and can block information for a corresponding family of observers (time-like curves). Since lack of information can be rel…