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Eternal Inflation and the Refined Swampland Conjecture
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC). University at Buffalo, USA.
Rekke forfattare: 12019 (engelsk)Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 122, nr 8, artikkel-id 081302Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

I apply recently proposed swampland conjectures to eternal inflation in single-scalar field theories. Eternal inflation is a phase of infinite self-reproduction of a quasi-de Sitter universe which has been argued to be a generic consequence of cosmological inflation. The originally proposed de Sitter swampland conjectures were shown by Matsui and Takahashi, and by Dimopoulos, to be generically incompatible with eternal inflation. However, the more recently proposed refined swampland conjecture imposes a slightly weaker criterion on the scalar field potential in inflation, and is consistent with the existence of a tachyonic instability. In this Letter, I show that eternal inflation is marginally consistent with the refined de Sitter swampland conjecture. Thus, if the refined conjecture is correct, the existence of a landscape-based multiverse in string theory is not incompatible with a self-consistent ultraviolet completion, with significant consequences for model building in string theory.

sted, utgiver, år, opplag, sider
2019. Vol. 122, nr 8, artikkel-id 081302
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URN: urn:nbn:se:su:diva-167661DOI: 10.1103/PhysRevLett.122.081302ISI: 000459920400003OAI: oai:DiVA.org:su-167661DiVA, id: diva2:1302192
Tilgjengelig fra: 2019-04-03 Laget: 2019-04-03 Sist oppdatert: 2019-04-03bibliografisk kontrollert

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