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  On the No-Boundary Proposal for Ekpyrotic and Cyclic Cosmologies

Battarra, L., & Lehners, J.-L. (2014). On the No-Boundary Proposal for Ekpyrotic and Cyclic Cosmologies. Journal of Cosmology and Astroparticle Physics, 2014(12 ), 23-23. doi:10.1088/1475-7516/2014/12/023.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-7677-A Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-7678-8
Genre: Journal Article

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 Creators:
Battarra, Lorenzo, Author
Lehners, Jean-Luc1, Author              
Affiliations:
1String 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,General Relativity and Quantum Cosmology, gr-qc
 Abstract: The no-boundary proposal provides a compelling theory for the initial conditions of our universe. We study the implications of such initial conditions for ekpyrotic and cyclic cosmologies. These cosmologies allow for the existence of a new type of "ekpyrotic instanton", which describes the creation of a universe in the ekpyrotic contraction phase. Remarkably, we find that the ekpyrotic attractor can explain how the universe became classical. In a cyclic context, in addition to the ekpyrotic instantons there exist de Sitter-like instantons describing the emergence of the universe in the dark energy phase. Our results show that typically the ekpyrotic instantons yield a higher probability. In fact, in a potential energy landscape allowing both inflationary and cyclic cosmologies, the no-boundary proposal implies that the probability for ekpyrotic and cyclic initial conditions is vastly higher than that for inflationary ones.

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 Dates: 2014-07-172014-12-092014
 Publication Status: Published in print
 Pages: 46 pages, 24 figures, v3: updated with version to be published in JCAP
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1407.4814
DOI: 10.1088/1475-7516/2014/12/023
 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: 2014 (12 ) Sequence Number: - Start / End Page: 23 - 23 Identifier: ISSN: 1475-7516
CoNE: http://pubman.mpdl.mpg.de/cone/journals/resource/111055183238000_1