Results 31 to 40 of about 63,236 (296)

Gravitational Collapse and Singularity Removal in Rastall Theory

Advances in High Energy Physics, 2021
In the present work, we study spherically symmetric gravitational collapse of a homogeneous fluid in the framework of Rastall gravity. Considering a nonlinear equation of state (EoS) for the fluid profiles, we search for a class of nonsingular collapse ...
Ehsan Dorrani
doaj   +1 more source

Non-linear instability of Kerr-type Cauchy horizons [PDF]

, 1995
Using the general solution to the Einstein equations on intersecting null surfaces developed by Hayward, we investigate the non-linear instability of the Cauchy horizon inside a realistic black hole.
A. Bonanno, A. Ori, A. Ori, C. Barrabès, C. Gundlach, C. Gundlach, C.G. Torre, Chris M. Chambers, E. Poisson, J. Smallwood, J.M. McNamara, M. Simpson, M.L. Gnedin, Patrick R. Brady, R. Balbinot, R. Penrose, R.A. d'Inverno, R.A. d'Inverno, R.A. Isaacson, R.H. Price, R.M. Wald, S. Chandrasekhar, S. Chandrasekhar, S.A. Hayward, S.A. Hayward, U. Yurtsever, W.A. Hiscock   +26 more
core   +2 more sources

Solving the Hierarchy Problem with Noncompact Extra Dimensions [PDF]

, 1999
We show that gravitational effects of global cosmic 3-branes can be responsible for compactification from six to four space-time dimensions, naturally producing the observed hierarchy between electroweak and gravitational forces. The finite radius of the
Andrew G. Cohen, Antoniadis, Antoniadis, Arkani-Hamed, Cohen, David B. Kaplan, Dvali, Gell-Mann, Gibbons, Gregory, Gregory, Hall, Kaluza, Klein, Klein, Sundrum, Visser   +16 more
core   +5 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

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

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

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

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

Gravitational duals to the grand canonical ensemble abhor Cauchy horizons

Journal of High Energy Physics, 2020
The gravitational dual to the grand canonical ensemble of a large N holographic theory is a charged black hole. These spacetimes — for example Reissner- Nordström-AdS — can have Cauchy horizons that render the classical gravitational dynamics of the ...
Sean A. Hartnoll, Gary T. Horowitz, Jorrit Kruthoff, Jorge E. Santos   +3 more
doaj   +1 more source

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