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Eternal Inflation and the Refined Swampland Conjecture
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). University at Buffalo, USA.
Number of Authors: 12019 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 122, no 8, article id 081302Article in journal (Refereed) 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.

Place, publisher, year, edition, pages
2019. Vol. 122, no 8, article id 081302
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-167661DOI: 10.1103/PhysRevLett.122.081302ISI: 000459920400003OAI: oai:DiVA.org:su-167661DiVA, id: diva2:1302192
Available from: 2019-04-03 Created: 2019-04-03 Last updated: 2019-04-03Bibliographically approved

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