Gravitational lensing by a photon sphere in a Reissner-Nordström naked singularity spacetime in strong deflection limits [PDF]
Physical Review D, 2021 We investigate gravitational lensing by a photon sphere in a Reissner-Nordstr\"{o}m naked singularity spacetime in strong deflection limits. Because of the nonexistence of an event horizon and the existence of a potential barrier near an antiphoton ...
N. Tsukamoto
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Gravitational Collapse and Space-Time Singularities [PDF]
Physical Review Letters, 1965 Roger Penrose
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Shell-crossings and shock formation during gravitational collapse in effective loop quantum gravity [PDF]
Physical Review D, 2023 Effective models of gravitational collapse in loop quantum gravity for the Lema\^itre-Tolman-Bondi spacetime predict that collapsing matter reaches a maximum finite density, bounces, and then expands outwards.
Francesco Fazzini +2 more
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Towards Black-Hole Singularity-Resolution in the Lorentzian Gravitational Path Integral [PDF]
Universe, 2020 Quantum gravity is expected to resolve the singularities of classical general relativity. Based on destructive interference of singular spacetime-configurations in the path integral, we find that higher-order curvature terms may allow to resolve black ...
Johanna N. Borissova, A. Eichhorn
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International Journal of Fundamental Physical Sciences, 2023 Astronomical observations confirm that gravitational force decreases with the square of the distance. If the gravitational force in the centre of Sagittarius A* were close to infinity and would decrease with the square of the distance, our Milky Way ...
Amrit Šorli
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Regular Black Holes: Towards a New Paradigm of Gravitational Collapse [PDF]
Springer Series in Astrophysics and Cosmology, 2022 The collapse of astrophysically significant bodies generates, under suitable conditions, black holes. Since one expects the generator of the black hole to be a rotating body, the black hole will also rotate.
R. Torres
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Finding singularities in gravitational lensing [PDF]
Monthly Notices of the Royal Astronomical Society, 2020 ABSTRACT The number of strong lens systems is expected to increase significantly in ongoing and upcoming surveys. With an increase in the total number of such systems, we expect to discover many configurations that correspond to unstable caustics. In such cases, the instability can be used to our advantage for constraining the lens model.
Ashish Kumar Meena, J S Bagla
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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
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Twisted and Singular Gravitating Vortices [PDF]
The Journal of Geometric Analysis, 2021 1 ...
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Did the Universe experience a pressure non-crushing type cosmological singularity in the recent past? [PDF]
, 2022 In the recent literature it has been shown that the H 0 tension may be eliminated if an abrupt physics transition changed the Cepheid parameters in the near past of the Universe, nearly 70–150 Myrs ago.
S. Odintsov, V. Oikonomou
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