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The zoo plot meets the swampland: mutual (in)consistency of single-field inflation, string conjectures, and cosmological data
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, United States of America.
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Stockholm University, Nordic Institute for Theoretical Physics (Nordita).ORCID iD: 0000-0002-7614-6677
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Stockholm University, Nordic Institute for Theoretical Physics (Nordita). University of Uppsala, Sweden.ORCID iD: 0000-0001-7958-8940
Number of Authors: 32019 (English)In: Classical and quantum gravity, ISSN 0264-9381, E-ISSN 1361-6382, Vol. 36, no 11, article id 117001Article in journal (Refereed) Published
Abstract [en]

We consider single-field inflation in light of string-motivated 'swampland' conjectures suggesting that effective scalar field theories with a consistent UV completion must have field excursion Delta(phi) less than or similar to M-Pl, in combination with a sufficiently steep potential, MPlV phi/V greater than or similar to O(1). Here, we show that the swampland conjectures are inconsistent with existing observational constraints on single-field inflation. Focusing on the observationally favoured class of concave potentials, we map the allowed swampland region onto the n(S)-r 'zoo plot' of inflationary models, and find that consistency with the Planck satellite and BICEP2/Keck Array requires MPlV phi/V less than or similar to 0.1 and -0.02 less than or similar to M-Pl(2)/V-phi phi < 0, in strong tension with swampland conjectures. Extension to non-canonical models such as DBI Inflation does not significantly weaken the bound.

Place, publisher, year, edition, pages
2019. Vol. 36, no 11, article id 117001
Keywords [en]
cosmic inflation, cosmic microwave background, swampland conjectures, Quantum Science & Technology
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-170084DOI: 10.1088/1361-6382/ab1d87ISI: 000467821800001OAI: oai:DiVA.org:su-170084DiVA, id: diva2:1334962
Available from: 2019-07-03 Created: 2019-07-03 Last updated: 2019-07-03Bibliographically approved

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Kinney, William H.Vagnozzi, SunnyVisinelli, Luca
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Department of PhysicsThe Oskar Klein Centre for Cosmo Particle Physics (OKC)Nordic Institute for Theoretical Physics (Nordita)
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