The zoo plot meets the swampland: mutual (in)consistency of single-field inflation, string conjectures, and cosmological data

By W. Kinney, S. Vagnozzi, Luca Visinelli. Classical and quantum gravity, 2018

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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 , in combination with a sufficiently steep potential, . 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 nS-r ‘zoo plot’ of inflationary models, and find that consistency with the Planck satellite and BICEP2/Keck Array requires and , in strong tension with swampland conjectures. Extension to non-canonical models such as DBI Inflation does not significantly weaken the bound.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/2d4e24c114c22c3ec38ce71e8a9ed3ab068fee43