Results 41 to 50 of about 62,947 (343)

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

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

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
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Anisotropic Multiverse with Varying c and G and Study of Its Thermodynamics

Universe, 2022
We assume the anisotropic model of the Universe in the framework of a varying speed of light c and a varying gravitational constant G theories and study different types of singularities.
Ujjal Debnath, Soumak Nag
doaj   +1 more source

Gravitational deflection of massive body around naked singularity

Nuclear Physics B
Spacetime singularity is not observed directly as it is covered by event horizon. Naked singularities may be formed due to gravitational collapse without an event horizon. Therefore, cosmic censorship conjecture entails advanced ascertainment.
Md Khalid Hossain, Keita Takizawa, Anikul Islam, Shyam Das, Farook Rahaman   +4 more
doaj   +1 more source

Classical and quantum equations of motion of an n-dimensional BTZ black hole

Physics Letters B, 2016
We investigate the gravitational collapse of a non-rotating n-dimensional BTZ black hole in AdS space in the context of both classical and quantum mechanics.
Eric Greenwood
doaj   +1 more source

Negative Pressure and Naked Singularities in Spherical Gravitational Collapse [PDF]

, 1996
Assuming the weak energy condition, we study the nature of the non-central shell-focussing singularity which can form in the gravitational collapse of a spherical compact object in classical general relativity.
Clarke C J S, Cooperstock F I, Dwivedi I H, F I Cooperstock, Jhingan S, Joshi P S, Lifshitz E M, P S Joshi, Podurets M A, S Jhingan, Singh T P, T P Singh, Wald R M, Wald R M   +13 more
core   +3 more sources

Singularities in quantum corrected space-times

Physics Letters B, 2020
In this paper we consider a static and regular fluid generating a locally spherically symmetric and time-independent space-time and calculate the leading quantum corrections to the metric to first order in curvature.
Xavier Calmet, Roberto Casadio, Folkert Kuipers   +2 more
doaj   +1 more source

Pulsar timing array observations as possible hints for nonsingular cosmology

European Physical Journal C: Particles and Fields, 2023
Recent pulsar timing array (PTA) experiments have reported strong evidence of the stochastic gravitational wave background (SGWB). If interpreted as primordial gravitational waves (GWs), the signal favors a strongly blue-tilted spectrum.
Mian Zhu, Gen Ye, Yong Cai
doaj   +1 more source

The late-time singularity inside non-spherical black holes

, 1998
It was long believed that the singularity inside a realistic, rotating black hole must be spacelike. However, studies of the internal geometry of black holes indicate a more complicated structure is typical. While it seems likely that an observer falling
A. Bonanno, A. Bonanno, A. Ori, A. Ori, A. Ori, A. Ori, A. Ori, C. Barrabés, C. Gundlach, C. W. Misner, E. Poisson, L. Burko, L. Burko, L. M. Burko, M. L. Gnedin, O. Ori, P. R. Brady, P. R. Brady, P. R. Brady, Patrick R. Brady, R. Balbinot, R. Balbinot, R. Herman, R. Isaacson, R. Penrose, R. Price, S. Chandrasekhar, S. Chandrasekhar, S. Droz, S. W. Hawking, Serge Droz, Sharon M. Morsink, U. Yurtsever, U. Yurtsever, V. A. Belinsky, W. G. Anderson, W. Hiscock, W. Krivan, W. Krivan, Y. Gursel   +39 more
core   +1 more source