Journal ArticleDOI
Homogenization and isotropization of an inflationary cosmological model
John D. Barrow,Ø. Grøn +1 more
TLDR
In this paper, a member of the class of anisotropic and inhomogeneous cosmological models constructed by Wainwright and Goode is investigated, which is shown to evolve exponentially rapidly towards the homogeneous and isotropic de Sitter universe model.About:
This article is published in Physics Letters B.The article was published on 1986-12-11. It has received 29 citations till now. The article focuses on the topics: De Sitter universe & Perfect Cosmological Principle.read more
Citations
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In the realm of the Hubble tension - a review of solutions
Eleonora Di Valentino,Olga Mena,Supriya Pan,Luca Visinelli,Weiqiang Yang,Alessandro Melchiorri,David F. Mota,Adam G. Riess,Adam G. Riess,Joseph Silk,Joseph Silk,Joseph Silk +11 more
TL;DR: In this paper, the authors present a thorough review of recent Hubble constant estimates and a summary of the proposed theoretical solutions, including early or dynamical dark energy, neutrino interactions, interacting cosmologies, primordial magnetic fields, and modified gravity.
Journal ArticleDOI
Cosmic No Hair Theorems and Inflation
TL;DR: In this article, an exact power-law inflationary solution with an exponential potential is given for a wide range of ever-expanding cosmological models by the assumption that positive spatial curvature implies the recopllpse of closed universes.
Journal ArticleDOI
Initial conditions for inflation
Dalia S. Goldwirth,Tsvi Piran +1 more
TL;DR: In this article, the authors review the various conditions required for the onset of both "chaotic" and "new" inflation, and discuss some of the physical significance of these conditions.
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The premature recollapse problem in closed inflationary universes
TL;DR: In this paper, it was shown that closed universes which begin in an extremely anisotropic state cannot recollapse until they are close to isotropy, which is also a necessary condition for inflation to occur.
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Revisiting Cosmic No-Hair Theorem for Inflationary Settings
TL;DR: In this paper, the authors revisited Wald's cosmic no-hair theorem in the context of accelerating Bianchi cosmologies for a generic cosmic fluid with nonvanishing anisotropic stress tensor and when the fluid energy-momentum tensor is of the form of a cosmological constant term plus a piece which does not respect strong or dominant energy conditions.
References
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Inflationary universe: A possible solution to the horizon and flatness problems
TL;DR: In this paper, the authors proposed a model of hot big-bang cosmology where the early universe is assumed to be highly homogeneous, in spite of the fact that separated regions were causally disconnected (horizon problem).
Journal ArticleDOI
Plane symmetric self-gravitating fluids with pressure equal to energy density
Romualdo Tabensky,A. H. Taub +1 more
TL;DR: In this paper, the Cauchy problem associated with the Einstein field equations is solved under the assumption that the source of the gravitational field is a perfect fluid with pressure,p, equal to energy density,w, and the space-time admits the three parameter group of motions of the Euclidean plane, that is, the space time is plane symmetric.
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Inhomogeneous cosmologies with cosmological constant
John D. Barrow,J. Stein-Schabes +1 more
TL;DR: In this paper, a new class of exact inhomogeneous solutions to Einstein's equations with non-zero cosmological constant and zero pressure was given, which generalize the de Sitter space-time and evolve towards a state that is stationary inside the event horizon of any future inextendible time-like curve and confirm the cosmic no hair conjecture.
Journal ArticleDOI
Some exact inhomogeneous cosmologies with equation of state p=. gamma mu
John Wainwright,S. W. Goode +1 more
TL;DR: In this article, a new class of exact solutions of the Einstein field equations with perfect fluid source and equation of state p =..gamma mu.. is presented, which can be interpreted as spatially inhomogeneous cosmological models.
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Production of entropy and viscous damping of anisotropy in homogeneous cosmological models: Bianchi type-I spaces
N. Caderni,R. Fabbri +1 more
TL;DR: In this paper, the authors investigated world models in which strong initial anisotropies are damped out by viscous dissipation at temperatures lower than 1012K, and the corresponding entropy production is calculated and is proved to be simply related to the initialanisotropy.