Results 41 to 50 of about 745,401 (375)
Collapsing and Expanding Cylindrically Symmetric Fields with Ligh-tlike Wave-Fronts in General Relativity [PDF]
, 2002 The dynamics of collapsing and expanding cylindrically symmetric gravitational and matter fields with lightlike wave-fronts is studied in General Relativity, using the Barrabes-Israel method.
Pereira, Paulo R. C. T., Wang, A. Z.
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Gravitational Collapse in Quantum Einstein Gravity [PDF]
Foundations of physics, 2017 The existence of spacetime singularities is one of the biggest problems of nowadays physics. According to Penrose, each physical singularity should be covered by a “cosmic censor” which prevents any external observer from perceiving their existence ...
A. Bonanno +2 more
semanticscholar +1 more source
GRAVITATIONAL COLLAPSE OF STARS AND THE METHODS OF ITS OBSERVATIONS
Odessa Astronomical Publications, 2016 It is present a review of the models of the later stages of stellar evolution and the mechanisms of the generation of neutrinos, charged particles and electromagnetic radiation during the gravitational collapse of stars.
V. G. Kryvdyk
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Dynamo effects in gravity [PDF]
E3S Web of Conferences, 2019 Nonlinear oscillations in the dynamic system of gravitational and material fields are considered. The problems of singularities and caustics in gravity, expansion and baryon asymmetry of the Universe, wave prohibition of collapse into black holes, and ...
Shevtsov Boris
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Characterizing the Gravitational Wave Signal from Core-collapse Supernovae [PDF]
Astrophysical Journal, 2018 We study the gravitational wave (GW) signal from eight new 3D core-collapse supernova simulations. We show that the signal is dominated by f- and g-mode oscillations of the protoneutron star (PNS) and its frequency evolution encodes the contraction rate ...
D. Radice +4 more
semanticscholar +1 more source
SPHERICALLY SYMMETRIC GRAVITATIONAL COLLAPSE [PDF]
Modern Physics Letters A, 2009 In this paper, we discuss gravitational collapse of spherically symmetric spacetimes. We derive a general formalism by taking two arbitrary spherically symmetric spacetimes with g00 = 1. Israel's junction conditions are used to develop this formalism. The formulas for extrinsic curvature tensor are obtained.
Sharif, M., Iqbal, Khadija
openaire +3 more sources
A conjectured upper bound on the Choptuik critical exponents
Nuclear Physics B, 2021 Near-critical type II gravitational collapse is characterized by the formation of arbitrarily small black holes whose horizon radii are described by the simple scaling law rBH∝(p−p⁎)γ, where γ is the matter-dependent Choptuik critical exponent and Δp≡p−p⁎
Shahar Hod
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Vaidya spacetime for Galileon gravity's rainbow
Nuclear Physics B, 2016 In this paper, we analyze Vaidya spacetime with an energy dependent metric in Galileon gravity's rainbow. This will be done using the rainbow functions which are motivated from the results obtained in loop quantum gravity approach and noncommutative ...
Prabir Rudra +2 more
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A perturbative approach to the time-dependent Karmarkar condition
European Physical Journal C: Particles and Fields, 2021 In this work we employ a perturbative approach to study the gravitational collapse of a shear-free radiating star. The collapse proceeds from an initial static core satisfying the time-independent Karmarkar condition and degenerates into a quasi-static ...
Megandhren Govender +3 more
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Gravitational Collapse in Higher Dimension [PDF]
, 2002 Spherically symmetric inhomogeneous dust collapse has been studied in higher dimensional space-time and appearance of naked singularity has been analyzed both for non-marginal and marginally bound cases.
Chakraborty, Subenoy, Debnath, Ujjal
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