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Naked singularity, firewall, and Hawking radiation [PDF]
Scientific Reports, 2017 Spacetime singularity has always been of interest since the proof of the Penrose-Hawking singularity theorem. Naked singularity naturally emerges from reasonable initial conditions in the collapsing process.
Hongsheng Zhang
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Non-linearity of Vaidya spacetime and forces in the central naked singularity
Physics of Complex Systems, 2022 The paper focuses on non-linear Vaidya spacetime, i. e., cases when the mass function has a non-linear form M(v) ≡ λvn , λ > 0, n > 1. We prove that the central naked singularity might form for values n > 1, however, under such conditions it will be ...
Виталий Дмитриевич Вертоградов
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A non-static quantum inspired spacetime in f(R) gravity: Gravity's rainbow [PDF]
Nuclear Physics B, 2020 In this note we explore a non-static spacetime in quantum regime in the background of f(R) gravity. The time dependent Vaidya metric which represents the spacetime of a radiating body like star is studied in an energy dependent gravity's rainbow, which ...
Prabir Rudra
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Event Horizon Telescope observations exclude compact objects in baseline mimetic gravity [PDF]
Scientific ReportsMimetic gravity has gained significant appeal in cosmological contexts, but static spherically symmetric space-times within the baseline theory are highly non-trivial: the two natural solutions are a naked singularity and a black hole space-time obtained
Mohsen Khodadi +2 more
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Can accretion properties distinguish between a naked singularity, wormhole and black hole? [PDF]
European Physical Journal C: Particles and Fields, 2020 We first advance a mathematical novelty that the three geometrically and topologically distinct objects mentioned in the title can be exactly obtained from the Jordan frame vacuum Brans I solution by a combination of coordinate transformations ...
R. Kh. Karimov +3 more
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Cosmic Censorship in Sgr A* and M87*: Observationally Excluding Naked Singularities
The Astrophysical JournalThe imaging of Sagittarius A* (Sgr A*) and the supermassive black hole at the center of Messier 87 (M87*) by the Event Horizon Telescope constrains the location and nature of emission from these objects.
Avery E. Broderick, Kiana Salehi
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Physics Letters B, 2019 We report about the possibility for interacting Kerr sources to exist in two different states – black holes or naked singularities – both states characterized by the same masses and angular momenta.
V.S. Manko, E. Ruiz
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Light trajectory and shadow shape in the rotating naked singularity
European Physical Journal C: Particles and Fields, 2022 In this paper, we investigate the light trajectories and shadow properties in the rotating version of null naked singularity (NNS) spacetime which is derived using the Newman–Janis algorithm without complexification method.
Vishva Patel +4 more
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Comparing accretion disk profiles of Bogush–Galt’sov naked singularity and Kerr black hole
European Physical Journal C: Particles and Fields, 2022 It is well known that the Einstein-scalar system of general relativity can in principle yield non-unique exact spinning naked singularities, which lead to unique Kerr black hole when the scalar field is switched off.
R. Kh. Karimov +3 more
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Shadows and precession of orbits in rotating Janis–Newman–Winicour spacetime
European Physical Journal C: Particles and Fields, 2022 In this paper, we construct the rotating Janis–Newman–Winicour (JNW) naked singularity spacetime using Newman–Janis Algorithm (NJA). We analyse NJA with and without complexification methods and find that the energy conditions do satisfied when we skip ...
Divyesh N. Solanki +4 more
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