Results 51 to 60 of about 3,462 (164)
The cosmological models with jump discontinuities
European Physical Journal C: Particles and Fields, 2018 The article is dedicated to one of the most undeservedly overlooked properties of the cosmological models: the behaviour at, near and due to a jump discontinuity.
Artyom Yurov +2 more
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COSMOLOGICAL MODELS GENERALIZING ROBERTSON–WALKER MODELS [PDF]
International Journal of Modern Physics D, 2003 Considering the physical 3-space t= constant of the space–time metrics as spheroidal and pseudo-spheroidal, cosmological models which are generalizations of Robertson–Walker models are obtained. Specific forms of these general models as solutions of Einstein's field equations are also discussed in the radiation and the matter dominated era of the ...
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STRUCTURED COSMOLOGICAL MODELS [PDF]
Proceedings of the National Academy of Sciences, 1965 Omer, G. C. jun. +2 more
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Journal of High Energy PhysicsThe phenomena of Squeezing and chaos have recently been studied in the context of inflation. We apply this formalism in the post-inflationary preheating phase.
Ayan Chakraborty, Debaprasad Maity
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Cosmological Models with Variable “Constants” [PDF]
International Journal of Theoretical Physics, 2000 15 pages.
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Anisotropic Cosmological Models with Two Fluids
Advances in High Energy Physics, 2018 Anisotropic dark energy cosmological models have been constructed in a Bianchi V space-time, with the energy momentum tensor consisting of two noninteracting fluids, namely, bulk viscous fluid and dark energy fluid.
B. Mishra, Pratik P. Ray, S. K. J. Pacif
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Cosmological Models and Stability [PDF]
, 2014 Based on a talk at the conference "Relativity and Gravitation, 100 Years after Einstein in Prague", at Charles University, Prague, June 25-29 ...
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Cosmology with One Galaxy: Autoencoding the Galaxy Properties Manifold
The Astrophysical JournalCosmological simulations like CAMELS and IllustrisTNG characterize hundreds of thousands of galaxies using various internal properties. Previous studies have demonstrated that machine learning can be used to infer the cosmological parameter Ω _m from the
Amanda Lue +4 more
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Testing quantum gravity with primordial gravitational waves
Journal of High Energy PhysicsWe propose a testable alternative to inflation directly built in a very general class of ultraviolet complete theories of quantum gravity enjoying Weyl invariance.
Gianluca Calcagni, Leonardo Modesto
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Spontaneous collapse models lead to the emergence of classicality of the Universe
Journal of High Energy PhysicsAssuming that Quantum Mechanics is universal and that it can be applied over all scales, then the Universe is allowed to be in a quantum superposition of states, where each of them can correspond to a different space-time geometry.
José Luis Gaona-Reyes +3 more
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