Results 41 to 50 of about 5,239 (155)
, 2017 Gravitational collapse of diffuse material has been investigated using a new solution of Einstein’s equations of general relativity. This replaces the theory of black-hole formation developed for the standard vacuum solution of Schwarzschild. The bodies which now form have reasonable physical properties, such as nuclear hard core density in collapsed ...
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An approximate treatment of gravitational collapse [PDF]
Physica D: Nonlinear Phenomena, 2013 This work studies a simplified model of the gravitational instability of an initially homogeneous infinite medium, represented by $\TT^d$, based on the approximation that the mean fluid velocity is always proportional to the local acceleration.
Ascasibar, Yago +2 more
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Complexity driven by anisotropy, inhomogeneity and dissipation
European Physical Journal C: Particles and FieldsThis work presents a detailed analysis of the gravitational collapse of a shear-free radiating, spherically symmetric imperfect fluid. The interior spacetime, characterized by dissipative and anisotropic pressure processes, is matched to an exterior ...
Lindani C. Majozi +3 more
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Calculation of radar signals delay to second order in the frame of the General Relativity Theory
ACI Avances en Ciencias e Ingenierías, 2014 From the Schwarzschild metric, the light delay due to a gravitational field is calculated to second order approximation in the gravitational potential. We analize the contribution of the second order terms for strong gravitational fields as the generated
Joaquín Valerio Grefa, Carlos A. Marín
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Gravitational collapse of a radiating shell [PDF]
Physical Review D, 2001 We study the collapse of a self-gravitating and radiating shell. Matter constituting the shell is quantized and the construction is viewed as a semiclassical model of possible black hole formation. It is shown that the shell internal degrees of freedom are excited by the quantum non-adiabaticity of the collapse and, consequently, on coupling them to a ...
Alberghi G. L. +3 more
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Arrow of Time in Gravitational Collapse
UniverseWe investigate the arrow of time problem in the context of gravitational collapse of radiating stars in higher dimensions for both neutral and charged matter.
Samarjit Chakraborty +3 more
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GRAVITATIONAL COLLAPSE WITH TANGENTIAL PRESSURE [PDF]
International Journal of Modern Physics D, 2011 Using the general formalism for spherical gravitational collapse developed in [P. S. Joshi and I. H. Dwivedi, Class. Quant. Grav.16 (1999) 41; P. S. Joshi and R. Goswami, Phys. Rev. D76 (2007) 084026], we investigate here the final fate of a spherical distribution of a matter cloud, where radial pressures vanish but tangential pressures are nonzero ...
Malafarina, Daniele, Joshi, Pankaj S.
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Stellar Collapse and Gravitational Waves [PDF]
, 2004 31 pages, 9 figures, to appear in "Stellar Collapse" (Astrophysics and Space Science), edited by C.
Fryer, Chris L. +3 more
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The river model of gravitational collapse
European Physical Journal C: Particles and FieldsWe show that the transformation of a time-evolving spherically symmetric metric tensor into a Painlevé–Gullstrand–Lemaître form brings forth a few curious consequences.
Soumya Chakrabarti
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Inflationary gravitational waves in collapse scheme models
Physics Letters B, 2016 The inflationary paradigm is an important cornerstone of the concordance cosmological model. However, standard inflation cannot fully address the transition from an early homogeneous and isotropic stage, to another one lacking such symmetries ...
Mauro Mariani +2 more
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