60 citations · 594 across the 28 of their papers we have counts for
28 papers
The hyperbolically symmetric black hole
L. Herrera, L. Witten
We describe some properties of the hyperbolically symmetric black hole (hereafter referred to as the ) proposed a few years ago. We start by explaining the main motivation be…
Geodesics of the hyperbolically symmetric black hole
L. Herrera, A. Di Prisco, J. Ospino +1
We carry out a systematic study on the motion of test particles in the region inner to the horizon of a hyperbolically symmetric black hole. The geodesic equations are written and…
An alternative approach to the static spherically symmetric vacuum global solution to the Einstein's equations
L. Herrera, L. Witten
We propose an alternative description of the Schwarzschild black hole based on the requirement that the solution be static not only outside the horizon but also inside it. As a con…
On a New Formulation of Vacuum Axisymmetric Solutions of general Relativity
Louis Witten
Axisymmetric Solutions of the vacuum Einstein equations are found in the Papapetrou-Weyl gauge. The solutions depend on two pairs of functionals, each pair of two functions depends…
Generating Solutions to the Einstein - Maxwell Equations
I. G. Contopoulos, F. P. Esposito, K. Kleidis +2
The Einstein-Maxwell (E-M) equations in a curved spacetime that admits at least one Killing vector are derived, from a Lagrangian density adapted to symmetries. In this context, an…
Generating Solutions to the Einstein Field Equations
I. G. Contopoulos, F. P. Esposito, K. Kleidis +2
Exact solutions to the Einstein field equations may be generated from already existing ones (seed solutions), that admit at least one Killing vector. In this framework, a space of…
Canonical Quantization of Spherically Symmetric Dust Collapse
Cenalo Vaz, Louis Witten
Quantum gravity effects are likely to play a crucial role in determining the outcome of gravitational collapse during its final stages. In this contribution we will outline a canon…
A Time-Like Naked Singularity
Rituparno Goswami, Pankaj S. Joshi, Cenalo Vaz +1
We construct a class of spherically symmetric collapse models in which a naked singularity may develop as the end state of collapse. The matter distribution considered has negative…
Exact Quantum State of Collapse and Black Hole Radiation
Cenalo Vaz, Louis Witten, T. P. Singh
We construct an exact quantum gravitational state describing the collapse of an inhomogeneous spherical dust cloud using a lattice regularization of the Wheeler-DeWitt equation. In…
Quantum general relativity and Hawking radiation
Cenalo Vaz, Claus Kiefer, T. P. Singh +1
In a previous paper we have set up the Wheeler-DeWitt equation which describes the quantum general relativistic collapse of a spherical dust cloud. In the present paper we speciali…
Toward a Quantization of Null Dust Collapse
Cenalo Vaz, Louis Witten, T. P. Singh
Spherically symmetric, null dust clouds, like their time-like counterparts, may collapse classically into black holes or naked singularities depending on their initial conditions.…
Quantum Black Holes from Quantum Collapse
Cenalo Vaz, Louis Witten
The Schwarzschild black hole can be viewed as the special case of the marginally bound Lema\^ıtre-Tolman-Bondi models of dust collapse which corresponds to a constant mass function…
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…
The Quantum States and the Statistical Entropy of the Charged Black Hole
Cenalo Vaz, Louis Witten
We quantize the Reissner-Nordström black hole using an adaptation of Kuchař's canonical decomposition of the Kruskal extension of the Schwarzschild black hole. The Wheeler-DeWitt e…
Spherical gravitational collapse: tangential pressure and related equations of state
Sukratu Barve, T. P. Singh, Louis Witten
We derive an equation for the acceleration of a fluid element in the spherical gravitational collapse of a bounded compact object made up of an imperfect fluid. We show that non-si…
A simple derivation of the naked singularity in spherical dust collapse
Sukratu Barve, T. P. Singh, Cenalo Vaz +1
We describe a simple method of determining whether the singularity that forms in the spherically symmetric collapse of inhomogeneous dust is naked or covered. This derivation consi…
Mass Quantization of the Schwarzschild Black Hole
Cenalo Vaz, Louis Witten
We examine the Wheeler-DeWitt equaton for a static, eternal Schwarzschild black hole in Kucha\v r-Brown variables and obtain its energy eigenstates. Consistent solutions vanish in…
Detecting Event Horizons and Stationary Surfaces
Richard G. Gass, F. Paul Esposito, L. C. R. Wijewardhana +1
We have investigated the behavior of three curvature invariants for Schwarzschild, Reissner-Nordstrøm, Kerr, and Kerr-Newman black holes. We have also studied these invariants for…
The Quantum Stress-Tensor in Self-Similar Spherical Dust Collapse
Sukratu Barve, T. P. Singh, Cenalo Vaz +1
We calculate the quantum stress tensor for a massless scalar field in the 2-d self-similar spherical dust collapse model which admits a naked singularity. We find that the outgoing…
On the Spectrum of the Radiation from a Naked Singularitry
Cenalo Vaz, Louis Witten
In the final stages of collapse, quantum radiation due to particle creation from a naked singularity is expected to be significantly different from black hole radiation. In certain…
Particle Creation in the Marginally Bound, Self Similar Collapse of Inhomogeneous Dust
S. Barve, T. P. Singh, Cenalo Vaz +1
We consider the evaporation of the (shell focusing) naked singularity formed during the self-similar collapse of a marginally bound inhomogeneous dust cloud, in the geometric optic…
Cosmic censorship and spherical gravitational collapse with tangential pressure
T. P. Singh, Louis Witten
We study the spherical gravitational collapse of a compact object under the approximation that the radial pressure is identically zero, and the tangential pressure is related to th…
Quantum Naked Singularities in 2d Dilaton Gravity
Cenalo Vaz, Louis Witten
Roughly speaking, naked singularities are singularities that may be seen by timelike observers. The Cosmic Censorship conjecture forbids their existence by stating that a reasonabl…
Do Naked Singularities Form?
Cenalo Vaz, Louis Witten
A naked singularity is formed by the collapse of a Sine-Gordon soliton in 1+1 dimensional dilaton gravity with a negative cosmological constant. We examine the quantum stress tenso…