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ID: 426878.0, MPI für Gravitationsphysik / Geometric Analysis and Gravitation
Evolution to a smooth universe in an ekpyrotic contracting phase with w>1
Authors:Garfinkle, David; Lim, Woei Chet; Pretorius, Frans; Steinhardt, Paul J.
Date of Publication (YYYY-MM-DD):2008-10-27
Title of Journal:Physical Review D
Volume:78
Issue / Number:08
Sequence Number of Article:083537
Review Status:not specified
Audience:Not Specified
Abstract / Description:A period of slow contraction with equation of state w>1, known as an ekpyrotic phase, has been shown to flatten and smooth the universe if it begins the phase with small perturbations. In this paper, we explore how robust and powerful the ekpyrotic smoothing mechanism is by beginning with highly inhomogeneous and anisotropic initial conditions and numerically solving for the subsequent evolution of the universe. Our studies, based on a universe with gravity plus a scalar field with a negative exponential potential, show that some regions become homogeneous and isotropic while others exhibit inhomogeneous and anisotropic behavior in which the scalar field behaves like a fluid with w=1. We find that the ekpyrotic smoothing mechanism is robust in the sense that the ratio of the proper volume of the smooth to nonsmooth region grows exponentially fast along time slices of constant mean curvature.
External Publication Status:published
Document Type:Article
Communicated by:Gerhard Huisken
Affiliations:MPI für Gravitationsphysik/Geometric Analysis and Gravitation
Identifiers:ISSN:0556-2821
DOI:10.1103/PhysRevD.78.083537
URL:http://link.aps.org/doi/10.1103/PhysRevD.78.083537
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