Results 11 to 20 of about 63,762 (335)
Gravitational deflection of massive body around naked singularity
Nuclear Physics BSpacetime 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 +4 more
doaj +3 more sources
Effects of a Late Gravitational Transition on Gravitational Waves and Anticipated Constraints
Universe, 2023 We investigate the evolution of gravitational waves through discontinuous evolution (transition) of the Hubble expansion rate H(z) at a sudden cosmological singularity, which may be due to a transition of the value of the gravitational constant.
Evangelos Achilleas Paraskevas +1 more
doaj +1 more source
Causal structure of singularity in non-spherical gravitational collapse
European Physical Journal C: Particles and Fields, 2022 We investigate here the final state of gravitational collapse of a non-spherical and non-marginally bound dust cloud as modeled by the Szekeres spacetime.
Dipanjan Dey +3 more
doaj +1 more source
Quantum dynamics corresponding to the chaotic BKL scenario
European Physical Journal C: Particles and Fields, 2023 We quantize the solution to the Belinski– Khalatnikov–Lifshitz (BKL) scenario using the integral quantization method. Quantization smears the gravitational singularity, preventing its localization in the configuration space.
Andrzej Góźdź +2 more
doaj +1 more source
Singular Monopoles and Gravitational Instantons [PDF]
Communications in Mathematical Physics, 1999 We model A_k and D_k asymptotically locally flat gravitational instantons on the moduli spaces of solutions of U(2) Bogomolny equations with prescribed singularities. We study these moduli spaces using Ward correspondence and find their twistor description.
Cherkis, Sergey A., Kapustin, Anton
openaire +3 more sources
Gravitational field of slightly deformed naked singularities
European Physical Journal C: Particles and Fields, 2022 We derive a particular approximate solution of Einstein equations, describing the gravitational field of a mass distribution that slightly deviates from spherical symmetry. The deviation is described by means of a quadrupole parameter that is responsible
Saken Toktarbay +3 more
doaj +1 more source
Leading singularities and classical gravitational scattering [PDF]
Journal of High Energy Physics, 2020 Abstract In this work we propose to use leading singularities to obtain the classical pieces of amplitudes of two massive particles whose only interaction is gravitational. Leading singularities are generalizations of unitarity cuts.
Cachazo, Freddy, Guevara, Alfredo
openaire +4 more sources
The nature of the naked singularity in generalized Vaidya spacetime and white hole geodesics
Physics of Complex Systems, 2021 This paper gives conditions to the energy-momentum tensor when the gravitational collapse of generalized Vaidya spacetime results in a naked singularity.
Виталий Дмитриевич Вертоградов
doaj +1 more source
Cosmology from Newton–Chern–Simons gravity
Nuclear Physics B, 2020 We study a five-dimensional non-relativistic gravity theory whose action is composed of a gravitational sector and a sector of matter where the gravitational sector is given by the so called Newton–Chern–Simons gravity and where the matter sector is ...
S. Lepe, G. Rubio, P. Salgado
doaj +1 more source
A bouncing cosmology from VECROs
European Physical Journal C: Particles and Fields, 2023 We argue that, in the same way that in a black hole space-time VECROs will form in order to cancel the gravitational effects of a collapsing mass shell and prevent the formation of a singularity, in a contracting universe a gas of VECROs will form to ...
Robert Brandenberger +1 more
doaj +1 more source