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  Converting entropy to curvature perturbations after a cosmic bounce

Fertig, A., Lehners, J.-L., Mallwitz, E., & Wilson-Ewing, E. (2016). Converting entropy to curvature perturbations after a cosmic bounce. Journal of Cosmology and Astroparticle Physics, 10: 005. doi:10.1088/1475-7516/2016/10/005.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-5F99-4 Version Permalink: http://hdl.handle.net/21.11116/0000-0002-EBA9-7
Genre: Journal Article

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 Creators:
Fertig, Angelika1, Author              
Lehners, Jean-Luc2, Author              
Mallwitz, Enno1, Author              
Wilson-Ewing, Edward3, Author              
Affiliations:
1Theoretical Cosmology, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_1753351              
2String Cosmology, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_1753351              
3Quantum Gravity & Unified Theories, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_24014              

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Free keywords: High Energy Physics - Theory, hep-th,Astrophysics, Cosmology and Extragalactic Astrophysics, astro-ph.CO
 Abstract: We study two-field bouncing cosmologies in which primordial perturbations are created in either an ekpyrotic or a matter-dominated contraction phase. We use a non-singular ghost condensate bounce model to follow the perturbations through the bounce into the expanding phase of the universe. In contrast to the adiabatic perturbations, which on large scales are conserved across the bounce, entropy perturbations can grow significantly during the bounce phase. If they are converted into adiabatic/curvature perturbations after the bounce, they typically form the dominant contribution to the observed temperature fluctuations in the microwave background, which can have several beneficial implications. For ekpyrotic models, this mechanism loosens the constraints on the amplitude of the ekpyrotic potential while naturally suppressing the intrinsic amount of non-Gaussianity. For matter bounce models, the mechanism amplifies the scalar perturbations compared to the associated primordial gravitational waves.

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 Dates: 2016-07-192016-07-252016
 Publication Status: Published in print
 Pages: 42 pages, 12 figures, v2: references added, submitted to JCAP
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1607.05663
URI: http://arxiv.org/abs/1607.05663
DOI: 10.1088/1475-7516/2016/10/005
 Degree: -

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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: 10 Sequence Number: 005 Start / End Page: - Identifier: ISSN: 1475-7516
CoNE: /journals/resource/111055183238000_1