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  Non-Singular Bouncing Cosmology: Consistency of the Effective Description

Koehn, M., Lehners, J.-L., & Ovrut, B. (2016). Non-Singular Bouncing Cosmology: Consistency of the Effective Description. Physical Review D, 93: 103501. doi:10.1103/PhysRevD.93.103501.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-60AF-8 Version Permalink: http://hdl.handle.net/21.11116/0000-0002-EDEC-A
Genre: Journal Article

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 Creators:
Koehn, Michael1, Author              
Lehners, Jean-Luc2, Author              
Ovrut, Burt, Author
Affiliations:
1String Cosmology, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_1753351              
2Theoretical Cosmology, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_1753351              

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Free keywords: High Energy Physics - Theory, hep-th,Astrophysics, Cosmology and Extragalactic Astrophysics, astro-ph.CO
 Abstract: We explicitly confirm that spatially flat non-singular bouncing cosmologies make sense as effective theories. The presence of a non-singular bounce in a spatially flat universe implies a temporary violation of the null energy condition, which can be achieved through a phase of ghost condensation. We calculate the scale of strong coupling and demonstrate that the ghost-condensate bounce remains trustworthy throughout, and that all perturbation modes within the regime of validity of the effective description remain under control. For this purpose we require the perturbed action up to third order in perturbations, which we calculate in both flat and co-moving gauge -- since these two gauges allow us to highlight different physical aspects. Our conclusion is that there exist healthy descriptions of non-singular bouncing cosmologies providing a viable resolution of the big-bang singularities in cosmological models. Our results also suggest a variant of ekpyrotic cosmology, in which entropy perturbations are generated during the contracting phase, but are only converted into curvature perturbations after the bounce.

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 Dates: 2015-12-112016
 Publication Status: Published in print
 Pages: 43 pages, 18 figures
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 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1512.03807
URI: http://arxiv.org/abs/1512.03807
DOI: 10.1103/PhysRevD.93.103501
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Title: Physical Review D
  Other : Phys. Rev. D.
Source Genre: Journal
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Publ. Info: Lancaster, Pa. : American Physical Society
Pages: - Volume / Issue: 93 Sequence Number: 103501 Start / End Page: - Identifier: ISSN: 0556-2821
CoNE: /journals/resource/111088197762258