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Related papers: Weyl entropy behaviour and Naked Singularities

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We study the evolution of the Weyl curvature invariant in all spatially homogeneous universe models containing a non-tilted gamma-law perfect fluid. We investigate all the Bianchi and Thurston type universe models and calculate the…

General Relativity and Quantum Cosmology · Physics 2009-11-07 John D. Barrow , Sigbjorn Hervik

In this work we study collapse of a general matter in a most general spacetime i.e., a spacetime with any matter and without (assuming) any symmetry. We show that the energy is completely trapped inside the null singularity and therefore…

General Relativity and Quantum Cosmology · Physics 2010-12-15 Shrirang S. Deshingkar

We investigate a class of horizonless solutions in Einstein-Weyl gravity, corresponding to the so-called attractive naked singularities of the (-2,2) type. In contrast to General Relativity, where naked singularities are generically…

General Relativity and Quantum Cosmology · Physics 2025-11-14 Alfio M. Bonanno , Samuele Silveravalle , Andrea Spina

Cosmic censorship protects the outside world from black hole singularities and paves the way for assigning entropy to gravity at the event horizons. We point out a tension between cosmic censorship and the quantum backreacted geometry of…

General Relativity and Quantum Cosmology · Physics 2024-03-21 José Navarro-Salas

We study the properties of a future singularity encountered by a perfect fluid observer in tilting spatially homogeneous Bianchi cosmologies. We derive the boost formulae for the Weyl tensor to establish that, for two observers that are…

General Relativity and Quantum Cosmology · Physics 2009-11-11 W. C. Lim , A. A. Coley , S. Hervik

One of the fundamental unanswered questions in the general theory of relativity is whether ``naked'' singularities, that is singular events which are visible from infinity, may form with positive probability in the process of gravitational…

Analysis of PDEs · Mathematics 2016-09-07 Demetrios Christodoulou

We use the formulation of thermodynamics of gravity as proposed by Clifton, Ellis and Tavakol on the gravitational collapse of dustlike matter, that violates the strong or weak cosmic censorship conjecture depending on the initial data. We…

General Relativity and Quantum Cosmology · Physics 2015-08-04 Giovanni Acquaviva , Rituparno Goswami , Aymen I. M. Hamid , Sunil D. Maharaj

We study the behavior of spatially homogeneous brane-worlds close to the initial singularity in the presence of both local and nonlocal stresses. It is found that the singularity in these brane-worlds can be locally either isotropic or…

General Relativity and Quantum Cosmology · Physics 2016-08-31 Alan A. Coley , Sigbjorn Hervik

The universe today, with structure such as stars, galaxies and black holes, seems to have evolved from a very homogeneous initial state. From this it appears as if the entropy of the universe is decreasing, in violation of the second law of…

General Relativity and Quantum Cosmology · Physics 2008-11-26 Oystein Rudjord , Oyvind Gron

We investigate the occurrence and nature of a naked singularity in the gravitational collapse of an inhomogeneous dust cloud described by a non self-similar higher dimensional Tolman spacetime. The necessary condition for the formation of a…

General Relativity and Quantum Cosmology · Physics 2009-10-31 S G Ghosh , A Beesham

Recent work has highlighted the deep connection between quantum information and spacetime geometry. Bousso and Shahbazi-Moghaddam (Phys. Rev. Lett. 128, 231301 (2022)) proved that ``hyperentropic'' regions -- where entropy exceeds the area…

High Energy Physics - Theory · Physics 2026-04-24 Naman Kumar

We undertake a rigorous study of the stability of the Cauchy horizon in the naked self-similar Lemaitre-Tolman-Bondi spacetimes under even parity linear perturbations. We use a combination of energy methods and results about L^p-spaces to…

General Relativity and Quantum Cosmology · Physics 2011-08-05 Emily M. Duffy , Brien C. Nolan

In this paper, we investigate the entropy of the free gravitational field for a given epoch for some well-known isotropic and anisotropic cosmologies. We use the definition of gravitational entropy proposed by Clifton, Ellis, and Tavakol,…

General Relativity and Quantum Cosmology · Physics 2021-06-08 Samarjit Chakraborty , Sarbari Guha , Rituparno Goswami

We investigate the occurrence of naked singularities, local and global, in the incoming Vaidya spacetimes with zero initial mass. While it is well-known that these spacetimes admit locally and globally naked singularities, we demonstrate…

General Relativity and Quantum Cosmology · Physics 2022-09-20 James Wheeler

We investigate the occurrence and nature of naked singularities in the Szekeres space-times. These space-times represent irrotational dust. They do not have any Killing vectors and they are generalisations of the Tolman-Bondi-Lemaitre…

General Relativity and Quantum Cosmology · Physics 2009-10-28 Pankaj S. Joshi , Andrzej Krolak

In this paper we extend the analysis of gravitational collapse of generalised Vaidya spacetimes to higher dimensions, in the context of the Cosmic Censorship Conjecture. We present the sufficient conditions on the generalised Vaidya mass…

General Relativity and Quantum Cosmology · Physics 2015-07-29 M. D. Mkenyeleye , Rituparno Goswami , Sunil D. Maharaj

In this paper we show that Quiescent Cosmology [1, 2, 3] is consistent with Penrose's Weyl Curvature Hypothesis and the notion of gravitational entropy [4]. Gravitational entropy, from a conceptual point of view, acts in an opposite fashion…

General Relativity and Quantum Cosmology · Physics 2012-12-18 Philip Threlfall , Susan M. Scott

A brief review is given of three recent results concerning classical solutions of gravitational theories: (1) With asymptotically anti de Sitter boundary conditions, there are matter theories satisfying the positive energy theorem which…

High Energy Physics - Theory · Physics 2014-11-18 Gary T. Horowitz

The Weyl tensor is the trace-free part of the Riemann tensor. Therefore, it is independent of the energy-momentum tensor and is thus not linked to the dynamics of gravitational fields. In this paper, we explore its possible thermodynamical…

General Relativity and Quantum Cosmology · Physics 2016-03-23 Nan Li , Xiao-Long Li , Shu-Peng Song

We study the occurrence of naked singularities in the spherically symmetric collapse of a charged null fluid in an expanding deSitter background - a piece of charged Vaidya-deSitter spacetime. The necessary conditions for the formation of a…

General Relativity and Quantum Cosmology · Physics 2009-10-31 A. Beesham , S. G. Ghosh