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  Cosmological Super-Bounce

Koehn, M., Lehners, J.-L., & Ovrut, B. A. (2014). Cosmological Super-Bounce. Physical Review D, 90(2): 025005. doi:10.1103/PhysRevD.90.025005.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-001A-22E5-7 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-001A-22E7-3
Genre: Journal Article

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1310.7577.pdf (Preprint), 2MB
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 Creators:
Koehn, Michael1, Author              
Lehners, Jean-Luc1, Author              
Ovrut, Burt A., Author
Affiliations:
1String Cosmology, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_1753351              

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Free keywords: High Energy Physics - Theory, hep-th,General Relativity and Quantum Cosmology, gr-qc
 Abstract: We study a model for a non-singular cosmic bounce in N=1 supergravity, based on supergravity versions of the ghost condensate and cubic Galileon scalar field theories. The bounce is preceded by an ekpyrotic contracting phase which prevents the growth of anisotropies in the approach to the bounce, and allows for the generation of scale-invariant density perturbations that carry over into the expanding phase of the universe. We present the conditions required for the bounce to be free of ghost excitations, as well as the tunings that are necessary in order for the model to be in agreement with cosmological observations. All of these conditions can be met. Our model thus provides a proof-of-principle that non-singular bounces are viable in supergravity, despite the fact that during the bounce the null energy condition is violated.

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 Dates: 2013-10-282013-11-072014
 Publication Status: Published in print
 Pages: 37 pages, 11 figures, v2: references added
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1310.7577
DOI: 10.1103/PhysRevD.90.025005
URI: http://arxiv.org/abs/1310.7577
 Degree: -

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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: 90 (2) Sequence Number: 025005 Start / End Page: - Identifier: ISSN: 0556-2821
CoNE: /journals/resource/111088197762258