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Fertig, Angelika; Lehners, Jean-Luc; Mallwitz, Enno
Funding organisation: SCOAP3, CERN, Geneva (Switzerland)2016
Funding organisation: SCOAP3, CERN, Geneva (Switzerland)2016
AbstractAbstract
[en] 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, for a large parameter range, it does not significantly 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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Available from http://dx.doi.org/10.1088/1475-7516/2016/08/073; Available from http://repo.scoap3.org/record/16998; PUBLISHER-ID: JCAP08(2016)073; OAI: oai:repo.scoap3.org:16998; cc-by Article funded by SCOAP3. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 License. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
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Journal of Cosmology and Astroparticle Physics; ISSN 1475-7516;
; v. 2016(08); p. 73

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