Results 61 to 70 of about 707,832 (374)

Can a false vacuum bubble remove the singularity inside a black hole?

European Physical Journal C: Particles and Fields, 2020
We investigate a regular black hole model with a de Sitter-like core at its center. This type of a black hole model with a false vacuum core was introduced with the hope of singularity-resolution and is a common feature shared by many regular black holes.
Suddhasattwa Brahma, Dong-han Yeom
doaj   +1 more source

Colliding gravitational waves and singularities

International Journal of Modern Physics A, 2023
We have investigated a model of colliding plain gravitational waves, proposed by Szekeres, whose structure of singularities is determined. We have evaluated a total energy of matter as a volume integral of the energy–momentum tensor (EMT), whose contributions arise only at these singularities. The total matter energy is conserved before a collision of
openaire   +2 more sources

Einstein-Klein-Gordon system by gravitational decoupling [PDF]

Europhysics letters, 2018
We investigate how a spherically symmetric scalar field can modify the Schwarzschild vacuum solution when there is no exchange of energy-momentum between the scalar field and the central source of the Schwarzschild metric.
J. Ovalle, J. Ovalle, R. Casadio, R. Casadio, R. D. Rocha, A. Sotomayor, Zdeněk Stuchlík   +6 more
semanticscholar   +1 more source

The Central Singularity in Spherical Collapse [PDF]

, 2000
The gravitational strength of the central singularity in spherically symmetric space-times is investigated. Necessary conditions for the singularity to be gravitationally weak are derived and it is shown that these are violated in a wide variety of ...
A. Krasiński, A. Ori, A. Ori, B. C. Nolan, Brien C. Nolan, C. J. S. Clarke, D. Christodoulou, D. M. Eardley, D. N. Page, E. Poisson, F. J. Tipler, G. F. R. Ellis, L. M. Burko, L. M. Burko, L. M. Burko, L. M. Burko, M. L. Gnedin, M. S. P. Eastham, P. R. Brady, S. A. Hayward, S. Hod, S. W. Hawking, T. P. Singh   +22 more
core   +2 more sources

Newtonian Analysis of Gravitational Waves from Naked Singularity [PDF]

, 2000
Spherical dust collapse generally forms a shell focusing naked singularity at the symmetric center. This naked singularity is massless. Further the Newtonian gravitational potential and speed of the dust fluid elements are everywhere much smaller than ...
A. Ori, A. Ori, A.M. Abrahams, C. Vaz, D. Christodoulou, D.M. Eardley, H. Iguchi, Hideo Iguchi, K.S. Thorne, Ken-ichi Nakao, P. Hübner, P.S. Joshi, P.S. Joshi, R. Penrose, R. Penrose, R.M. Wald, R.P.A.C. Newman, S. Barve, S. Barve, S. Jhingan, S.A. Hayward, S.L. Shapiro, S.W. Hawking, S.W. Hawking, T. Chiba, T. Harada, T. Harada, T. Harada, T. Harada, T. Harada, T. Nakamura, T. Nakamura, T. Nakamura, T.P. Singh, Tomohiro Harada   +34 more
core   +2 more sources

Instability of black hole formation under small pressure perturbations [PDF]

, 2012
We investigate here the spectrum of gravitational collapse endstates when arbitrarily small perfect fluid pressures are introduced in the classic black hole formation scenario as described by Oppenheimer, Snyder and Datt (OSD) [1].
A Ori, A Ori, A Ori, B Waugh, C Gundlach, D Christodoulou, Daniele Malafarina, DM Eardley, E Sorkin, G Magli, G Magli, H Bondi, I Bombaci, JF Villas da Rocha, JR Oppenheimer, JR Oppenheimer, M Patil, M Patil, MW Choptuik, MW Choptuik, Pankaj S. Joshi, PS Joshi, PS Joshi, PS Joshi, PS Joshi, PS Joshi, PS Joshi, PS Joshi, PS Joshi, PS Joshi, R Giambo, R Giambó, R Giambó, R Goswami, R Penrose, RC Tolman, RPAC Newman, S Datt, SE Woosley, SG Ghosh, SMCV Goncalves, T Foglizzo, T Harada, T Harada, T Harada   +44 more
core   +3 more sources

Does a primary hair have an impact on the naked singularity formation in hairy Vaidya spacetime?

Physics of Complex Systems
We consider the gravitational collapse of Vaidya spacetime, which has been obtained using the gravitational decoupling method. In this paper, we are interested in whether a primary hair has any impact on the endstate of the gravitational collapse.
Виталий Дмитриевич Вертоградов
doaj   +1 more source

Matter and gravitons in the gravitational collapse

Physics Letters B, 2016
We consider the effects of gravitons in the collapse of baryonic matter that forms a black hole. We first note that the effective number of (soft off-shell) gravitons that account for the (negative) Newtonian potential energy generated by the baryons is ...
Roberto Casadio, Andrea Giugno, Andrea Giusti   +2 more
doaj   +1 more source

The spectrum of endstates of gravitational collapse with tangential stresses [PDF]

, 2001
The final state--black hole or naked singularity--of the gravitational collapse of a marginally bound matter configuration in the presence of tangential stresses is classified, in full generality, in terms of the initial data and equation of state.
A. Ori, E. Seidel, G. Magli, G. Magli, Giulio Magli, H. Kudoh, J. Kijowski, J. R. Oppenheimer, P. R. Brady, P. R. C. T. Pereira, P. S. Joshi, P. S. Joshi, P. S. Joshi, R. Penrose, S. Jhingan, S. L. Shapiro, Sanjay Jhingan, Sérgio M. C. V. Gonçalves, T. Harada, T. Harada, T. Nakamura, W. B. Bonnor   +21 more
core   +2 more sources

Towards conditions for black-hole singularity-resolution in asymptotically safe quantum gravity [PDF]

Classical and quantum gravity, 2018
We explore the fate of the curvature singularity of Schwarzschild (deSitter) black holes in asymptotically safe quantum gravity. Specifically, we upgrade the classical spacetime by including the running of the Newton coupling and cosmological constant ...
Adémọ́lá Adéìfẹ́ọba, A. Eichhorn, Alessia Benedetta Platania   +2 more
semanticscholar   +1 more source