Results 1 to 10 of about 63,236 (296)

Non-marginally bound inhomogeneous dust collapse in higher dimensional space-time [PDF]

, 2002
We investigate the occurrence and nature of a naked singularity in the gravitational collapse of an inhomogeneous dust cloud described by a self-similar higher dimensional Tolman-Bondi space-time.
A. BANERJEE, S. G. GHOSH, Tipler F. J.
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Gravitational dipole moment from an exact solution with torsion

New Journal of Physics, 2020
Dipole fields are common in electromagnetism and may be viewed as the result of a positive and negative charge (or pole) which are close together. A dipole field in gravity is not expected to exist because negative mass has never been observed.
R T Hammond
doaj   +1 more source

Big bang of the brane universe [PDF]

, 2001
Big bang of the Friedmann-Robertson-Walker (FRW)-brane universe is studied. In contrast to the spacelike initial singularity of the usual FRW universe, the initial singularity of the FRW-brane universe is point-like from the viewpoint of causality ...
A. Lukas, A. Lukas, A. Lukas, C. Csáki, D. Ida, D. Lynden-Bell, D.J.H. Chung, E.J. Squires, G.W. Gibbons, H. Ishihara, Hideki Ishihara, J. Garriga, J. Rosen, J.M. Cline, L. Randall, M. Gogberashvili, M. Gogberashvili, M. Visser, P. Binétruy, P. Binétruy, P. Horava, T. Shiromizu, V.A. Rubakov, W. Israel   +23 more
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Naked Singularities in Spherically Symmetric Inhomogeneous Tolman-Bondi Dust Cloud Collapse [PDF]

, 1993
We investigate the occurrence and nature of naked singularity for the inhomogeneous gravitational collapse of Tolman-Bondi dust clouds.It is shown that the naked singularities form at the center of the collapsing cloud in a wide class of collapse models ...
A. Ori, A. Ori, A. Papapetrou, B. Waugh, C. J. S. Clarke, D. Christodoulou, D. M. Eardley, D. M. Eardley, D. M. Eardley, F. J. Tipler, F. J. Tipler, F. Verhulst, G. Grillo, H. Bondi, H. Muller, I. H. Dwivedi, I. H. Dwivedi, I. H. Dwivedi, I. H. Dwivedi, J. Hellaby, J. Oppenheimer, J. P. S. Lemos, K. Lake, K. Lake, K. Rajagopal, P. S. Joshi, P. S. Joshi, P. S. Joshi, P. S. Joshi, P. S. Joshi, P. S. Joshi, R. C. Tolman, R. Hagedorn, R. P. A. C. Newman, R. P. A. C. Newman, R. Penrose, R. Penrose, R. Penrose, T. Davies, T. Nakamura, W. Israel, W. Israel, Y. Kuroda   +42 more
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Stability of Schwarzschild singularity in non-local gravity

Physics Letters B, 2017
In a previous work, it was shown that all Ricci-flat spacetimes are exact solutions for a large class of non-local gravitational theories. Here we prove that, for a subclass of non-local theories, the Schwarzschild singularity is stable under linear ...
Gianluca Calcagni, Leonardo Modesto
doaj   +1 more source

Quantum vacuum effects on the formation of black holes

Journal of High Energy Physics, 2023
We study the backreaction of quantum fields induced through the vacuum polarization and the conformal anomaly on the collapse of a thin shell of dust. It is shown that the final fate of the collapse process depends on the physical properties of the shell,
Moslem Shafiee, Yousef Bahrampour
doaj   +1 more source

On Gravitational Fields in Superconductors

Frontiers in Physics, 2022
DeWitt’s theory on superconductors in gravitational fields is re-derived in the low velocity limit and linear gravity from the Klein-Gordon equation for an ensemble of charged spinless bosons. The solution has a phase singularity that gives rise to boson
Giorgio Papini
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A Non-singular Theory of Gravity

, 1994
We present a geometrical gravitational theory which reduces to Einstein's theory for weak gravitational potentials and which has a singularity-free analog of the Schwarzschild metric.Comment: 8 pages, RevTeX, 3 figures included in compressed form, UTPT ...
Bernstein, Bonnor, Bonnor, Cornish, Cornish, Dymnikova, Einstein, Einstein, John W. Moffat, Mann, Markov, Moffat, Moffat, Moffat, Morgan, Neil J. Cornish, Papapetrou, Poisson, Starobinsky, Trodden, Vanstone, Wyman   +21 more
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An extreme critical space-time: echoing and black-hole perturbations [PDF]

, 2000
A homothetic, static, spherically symmetric solution to the massless Einstein- Klein-Gordon equations is described. There is a curvature singularity which is central, null, bifurcate and marginally trapped.
Ashtekar A, Brady P R, Choptuik M W, Christodoulou D, Gundlach C, Gundlach C, Hara T, Hayward S A, Królak A, Oshiro Y, Penrose R, Roberts M D, Sean A Hayward   +12 more
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Quantum solitonic wave-packet of a meso-scopic system in singularity free gravity

Nuclear Physics B, 2018
In this paper we will discuss how to localise a quantum wave-packet due to self-gravitating meso-scopic object by taking into account gravitational self-interaction in the Schrödinger equation beyond General Relativity.
Luca Buoninfante, Gaetano Lambiase, Anupam Mazumdar   +2 more
doaj   +1 more source