Results 11 to 20 of about 681 (164)
Spacetime singularities and invariance [PDF]
Belgrade Philosophical Annual, 2016 This paper explains why spacetime singularities do not constitute a breakdown of physical laws, and points out that the difference between the metrics at singularities and those outside of singularities is factual, rather than nomological.
Stoica Cristinel O., Toader Iulian D.
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A singular conformal spacetime [PDF]
Journal of Geometry and Physics, 2006 The infinite cosmological "constant" limit of the de Sitter solutions to Einstein's equation is studied. The corresponding spacetime is a singular, four-dimensional cone-space, transitive under proper conformal transformations, which constitutes a new example of maximally-symmetric spacetime. Grounded on its geometric and thermodynamic properties, some
Aldrovandi, R. +2 more
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QUANTUM SINGULARITIES IN STATIC SPACETIMES [PDF]
International Journal of Modern Physics D, 2011 We review the mathematical framework necessary to understand the physical content of quantum singularities in static spacetimes. We present many examples of classical singular spacetimes and study their singularities by using wave packets satisfying Klein–Gordon and Dirac equations.
Pitelli, João Paulo M. +1 more
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Penrose limits and spacetime singularities [PDF]
Classical and Quantum Gravity, 2004 We give a covariant characterisation of the Penrose plane wave limit: the plane wave profile matrix $A(u)$ is the restriction of the null geodesic deviation matrix (curvature tensor) of the original spacetime metric to the null geodesic, evaluated in a comoving frame.
Blau, M +3 more
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Quantum probes of spacetime singularities [PDF]
Physical Review D, 1995 12 pages, RevTeX, no figures, A few breif comments added and typos ...
Horowitz, Gary T., Marolf, Donald
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Exploration of a singular fluid spacetime [PDF]
General Relativity and Gravitation, 2021 AbstractWe investigate the properties of a special class of singular solutions for a self-gravitating perfect fluid in general relativity: the singular isothermal sphere. For arbitrary constant equation-of-state parameter $$w=p/\rho $$ w = p /
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Spacetimes with singularities [PDF]
Analele Universitatii "Ovidius" Constanta - Seria Matematica, 2012 Abstract We report on some advances made in the problem of singularities in general relativity.First is introduced the singular semi-Riemannian geometry for metrics which can change their signature (in particular be degenerate). The standard operations like covariant contraction, covariant derivative, and constructions like the Riemann curvature are ...
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COSMOLOGICAL SINGULARITIES IN FLRW SPACETIMES [PDF]
The Twelfth Marcel Grossmann Meeting, 2012 3 pages, ws-procs975x65.cls to appear in Proceedings of 12th Marcel Grossmann Meeting ...
Fernández Jambrina, Leonardo +1 more
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SPACETIME SINGULARITIES: RECENT DEVELOPMENTS [PDF]
International Journal of Modern Physics D, 2013 Recent developments concerning oscillatory spacelike singularities in general relativity are taking place on two fronts. The first treats generic singularities in spatially homogeneous cosmology, most notably Bianchi types VIII and IX. The second deals with generic oscillatory singularities in inhomogeneous cosmologies, especially those with two ...
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Singularities in hyperscaling violating spacetimes [PDF]
Journal of High Energy Physics, 2013 We examine spacetimes which generalize Lifshitz scaling to allow hyperscaling violation invariance (i.e. a constant conformal transformation) for the types of singularities frequently found in the Lifshitz case. We find that most of these spacetimes suffer either from a traditional naked curvature singularity or a null curvature singularity robust ...
Copsey, Keith, Mann, Robert
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