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  Cosmological Perturbations Through a Non-Singular Ghost-Condensate/Galileon Bounce

Battarra, L., Köhn, M., Lehners, J.-L., & Ovrut, B. A. (2014). Cosmological Perturbations Through a Non-Singular Ghost-Condensate/Galileon Bounce. Journal of Cosmology and Astroparticle Physics, 2014(7): 007. doi:10.1088/1475-7516/2014/07/007.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-7712-2 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0025-0225-2
Genre: Journal Article

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1404.5067.pdf (Preprint), 3MB
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 Creators:
Battarra, Lorenzo1, Author
Köhn, Michael2, Author              
Lehners, Jean-Luc1, Author              
Ovrut, Burt A., Author
Affiliations:
1Theoretical Cosmology, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, escidoc:1753351              
2String Cosmology, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, escidoc:1753351              

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Free keywords: High Energy Physics - Theory, hep-th,Astrophysics, Cosmology and Extragalactic Astrophysics, astro-ph.CO
 Abstract: We study the propagation of super-horizon cosmological perturbations in a non-singular bounce spacetime. The model we consider combines a ghost condensate with a Galileon term in order to induce a ghost-free bounce. Our calculation is performed in harmonic gauge, which ensures that the linearized equations of motion remain well-defined and non-singular throughout. We find that, despite the fact that near the bounce the speed of sound becomes imaginary, super-horizon curvature perturbations remain essentially constant across the bounce. In fact, we show that there is a time close to the bounce where curvature perturbations of all wavelengths are required to be momentarily exactly constant. We relate our calculations to those performed in other gauges, and comment on the relation to previous results in the literature.

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 Dates: 2014-04-202014-05-052014
 Publication Status: Published in print
 Pages: 28 pages, 16 figures, v2: references added
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1404.5067
DOI: 10.1088/1475-7516/2014/07/007
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Title: Journal of Cosmology and Astroparticle Physics
Source Genre: Journal
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Publ. Info: Bristol, England : Institute of Physics Pub.
Pages: - Volume / Issue: 2014 (7) Sequence Number: 007 Start / End Page: - Identifier: ISSN: 1475-7516
CoNE: http://pubman.mpdl.mpg.de/cone/journals/resource/111055183238000_1