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  Conflation: a new type of accelerated expansion

Fertig, A., Lehners, J.-L., & Mallwitz, E. (2016). Conflation: a new type of accelerated expansion. Journal of Cosmology and Astroparticle Physics, 2016(08): 073. doi:10.1088/1475-7516/2016/08/073.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-272B-5 Version Permalink: http://hdl.handle.net/21.11116/0000-0002-EBA7-9
Genre: Journal Article

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 Creators:
Fertig, A.1, Author              
Lehners, J.-L.2, Author              
Mallwitz, E1, 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              

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Free keywords: High Energy Physics - Theory, hep-th,Astrophysics, Cosmology and Extragalactic Astrophysics, astro-ph.CO
 Abstract: In the framework of scalar-tensor theories of gravity, we construct a new kind of cosmological model that conflates inflation and ekpyrosis. During a phase of conflation, the universe undergoes accelerated expansion, but with crucial differences compared to ordinary inflation. In particular, the potential energy is negative, which is of interest for supergravity and string theory where both negative potentials and the required scalar-tensor couplings are rather natural. A distinguishing feature of the model is that it does not amplify adiabatic scalar and tensor fluctuations, and in particular does not lead to eternal inflation and the associated infinities. We also show how density fluctuations in accord with current observations may be generated by adding a second scalar field to the model. Conflation may be viewed as complementary to the recently proposed anamorphic universe of Ijjas and Steinhardt.

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 Dates: 2015-07-162015-08-072016
 Publication Status: Published in print
 Pages: 20 pages, 5 figures, v2: references added
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 Identifiers: arXiv: 1507.04742
URI: http://arxiv.org/abs/1507.04742
DOI: 10.1088/1475-7516/2016/08/073
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Title: Journal of Cosmology and Astroparticle Physics
Source Genre: Journal
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Pages: - Volume / Issue: 2016 (08) Sequence Number: 073 Start / End Page: - Identifier: -