Results 41 to 50 of about 32,545 (270)

Inhomogeneity effects in Cosmology

, 2011
This article looks at how inhomogeneous spacetime models may be significant for cosmology. First it looks at how the averaging process may affect large scale dynamics, with backreaction effects leading to effective contributions to the averaged energy ...
Ellis, George F R
core   +1 more source

Quasi-Isotropization of the Inhomogeneous Mixmaster Universe Induced by an Inflationary Process [PDF]

, 2002
We derive a ``generic'' inhomogeneous ``bridge'' solution for a cosmological model in the presence of a real self-interacting scalar field. This solution connects a Kasner-like regime to an inflationary stage of evolution and therefore provides a ...
A. A. Kirillov, A.A. Kirillov, A.A. Kirillov, A.A. Kirillov, A.A. Kirillov, A.A. Kirillov, A.A. Kirillov, A.A. Starobinsky, A.D. Linde, A.D. Linde, A.H. Guth, B.K. Berger, B.K. Berger, C.P. Ma, C.W. Misner, C.W. Misner, D.F. Chernoff, E.M. Lifshitz, G. Montani, G. Montani, G. Montani, G.P. Imponente, I.M. Khalatnikov, I.M. Khalatnikov, J. Silk, J.D. Barrow, J.D. Barrow, L. Andersson, P. de Bernardis, R.M. Wald, S. Coleman, T. Damour, T. Damour, V.A. Belinki, V.A. Belinskii, V.A. Belinskii, X.-F. Lin, X.-F. Lin   +37 more
core   +3 more sources

Observational Foundations of Inhomogeneous Universe [PDF]

Symposium - International Astronomical Union, 1974
Using new observational data at optical (Jagiellonian Field) and radio (GB region) frequencies, the distributions of galaxies and radio sources are analysed.The results of the analysis show that there is a significant non-random surface distribution of galaxies irrespective of the scale of the field investigated.
P. Flin, J. Machalski, J. Maslowski, M. Urbanik, A. Zieba, S. Zieba   +5 more
openaire   +1 more source

Compact hyperbolic universe and singularities [PDF]

, 1996
Recently many people have discussed the possibility that the universe is hyperbolic and was in an inflationary phase in the early stage. Under these assumptions, it is shown that the universe cannot have compact hyperbolic time-slices.
A. H. Guth, A. Vilenkin, A. Vilenkin, A. Vilenkin, Akihiro Ishibashi, C. Weber, D. Sullivan, E. Hopf, J. B. Hartle, J. R. Gott III, J. R. Gott III, K. Sato, L. Z. Fang, M. Bucher, M. Fukugita, M. Lachièze-Rey, M. Sasaki, M. Siino, M. Taniguchi, Masaru Siino, N. J. Cornish, P. J. Nicholls, P. T. Chruściel, R. Penrose, S. Coleman, S. Kobayashi, S. W. Hawking, Sadayoshi Kojima, T. Tanaka, T. Tanaka, Tatsuhiko Koike, V. I. Arnold, V. Moncrief   +32 more
core   +2 more sources

Lemaitre-Tolman-Bondi model and accelerating expansion

, 2007
I discuss the spherically symmetric but inhomogeneous Lemaitre-Tolman- Bondi (LTB) metric, which provides an exact toy model for an inhomogeneous universe.
A. Blanchard, A. Krasinski, A. Oliveira-Costa de, A.A. Coley, A.D. Dolgov, A.G. Riess, A.G. Riess, C. Bonvin, D. Garfinkle, D.J. Eisenstein, D.J. Schwarz, D.J.H. Chung, D.N. Spergel, E Hubble, E.J. Copeland, G.F.R. Ellis, H. Alnes, H. Alnes, H. Alnes, H. Alnes, H. Bondi, H. Iguchi, I. Zehavi, J.F. Pascual-Sanchez, J.W. Moffat, K. Enqvist, K. Tomita, K. Tomita, K. Tomita, Kari Enqvist, M. Célérier, N. Straumann, P. Astier, P.S. Apostolopoulos, R.A. Vanderveld, R.C. Tolman, S. Perlmutter, S. Räsänen, S. Räsänen, T. Koivisto, W.J. Frith, W.L. Freedman   +41 more
core   +1 more source

Electrodynamics in an LTB scenario [PDF]

, 2014
In this article we analyze the electrodynamics in curved space-time in LTB metric. We calculate the most general scale factor in this inhomogeneous Universe.
Fanizza, G., Tedesco, L.
core   +2 more sources

Type V singularities with inhomogeneous equations of state

Physics Letters B, 2022
Interest in cosmological singularities has remarkably grown in recent times, particularly on future singularities with the discovery of late-time acceleration of the universe and dark energy.
Oem Trivedi
doaj   +1 more source

Inhomogeneous Equation of State of the Universe: Phantom Era, Future Singularity and Crossing the Phantom Barrier

, 2005
The dark energy universe equation of state (EOS) with inhomogeneous,Hubble parameter dependent term is considered. The motivation to introduce such a term comes from time-dependent viscosity considerations and modifications of general relativity.
C. Csaki, S. Weinberg, Sergei D. Odintsov, Shin’ichi Nojiri   +3 more
core   +1 more source

INHOMOGENEOUS UNIVERSE IN LOOP QUANTUM GRAVITY [PDF]

The Thirteenth Marcel Grossmann Meeting, 2015
3 pages, contribution to the Proceedings of the 13th Marcel Grossman Meeting (Stockholm, Sweden, July 1-7 2012)
openaire   +2 more sources

Weyl Curvature Hypothesis in Light of Quantum Backreaction at Cosmological Singularities or Bounces

Universe, 2021
The Weyl curvature constitutes the radiative sector of the Riemann curvature tensor and gives a measure of the anisotropy and inhomogeneities of spacetime.
Bei-Lok Hu
doaj   +1 more source