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  Ekpyrotic Perturbations With Small Non-Gaussian Corrections

Fertig, A., Lehners, J.-L., & Mallwitz, E. (2014). Ekpyrotic Perturbations With Small Non-Gaussian Corrections. Physical Review D, 89: 103537. doi:10.1103/PhysRevD.89.103537.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-001A-0E49-5 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-001A-241F-A
Genre: Journal Article

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 Creators:
Fertig, Angelika1, Author
Lehners, Jean-Luc2, Author              
Mallwitz, Enno1, Author
Affiliations:
1AEI-Golm, MPI for Gravitational Physics, Max Planck Society, Golm, DE, ou_24008              
2String 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: The entropic mechanism for producing nearly scale-invariant density perturbations in a contracting ekpyrotic universe relies on having an unstable scalar potential. Here we develop a variant of this mechanism (recently proposed by Qiu, Gao and Saridakis, and by Li), in which there exists a non-trivial coupling between adiabatic and entropic fields, and where an unstable potential is not required. In the model nearly scale-invariant entropy perturbations are generated first. Remarkably, we find that the bispectrum of these perturbations vanishes, with the values of the non-Gaussianity parameters of local, equilateral and orthogonal type all exactly zero. Subsequently, the entropy perturbations can be converted into curvature perturbations by a variety of mechanisms. The bispectrum of the curvature perturbations depends on the non-linearity of the conversion process and is thus more model-dependent - however, for an efficient conversion process the final bispectrum remains small. The only distinguishing feature compared to single-field slow-roll inflationary models is an absence of primordial gravitational waves. Thus the present model provides a perfect match to current data from the PLANCK satellite.

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 Dates: 2013-10-302013-11-062014
 Publication Status: Published in print
 Pages: 5 pages, v2: references added
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1310.8133
DOI: 10.1103/PhysRevD.89.103537
URI: http://arxiv.org/abs/1310.8133
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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: 89 Sequence Number: 103537 Start / End Page: - Identifier: ISSN: 0556-2821
CoNE: /journals/resource/111088197762258