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Bounds on slow roll and the de Sitter Swampland

Garg, Sumit K and Krishnan, Chethan (2019) Bounds on slow roll and the de Sitter Swampland. In: JOURNAL OF HIGH ENERGY PHYSICS (11).

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Official URL: http:/dx.doi.org/10.1007/JHEP11(2019)075

Abstract

The recently introduced swampland criterion for de Sitter 17] can be viewed as a (hierarchically large) bound on the smallness of the slow roll parameter epsilon(V). This leads us to consider the other slow roll parameter eta(V) more closely, and we are lead to conjecture that the bound is not necessarily on epsilon(V), but on slow roll itself. A natural refinement of the de Sitter swampland conjecture is therefore that slow roll is violated at O(1) in Planck units in any UV complete theory. A corollary is that epsilon(V) need not necesarily be O(1), if eta(V) less than or similar to -O(1) holds. We consider various tachyonic tree level constructions of de Sitter in IIA/IIB string theory (as well as closely related models of inflation), which superficially violate 17], and show that they are consistent with this refined version of the bound. The phrasing in terms of slow roll makes it plausible why both versions of the conjecture run into trouble when the number of e-folds during inflation is high. We speculate that one way to evade the bound could be to have a large number of fields, like in N-flation.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to SPRINGER
Keywords: Cosmology of Theories beyond the SM; Superstring Vacua; Flux compactifications
Department/Centre: Division of Physical & Mathematical Sciences > Centre for High Energy Physics
Depositing User: Id for Latest eprints
Date Deposited: 16 Dec 2019 10:53
Last Modified: 16 Dec 2019 10:53
URI: http://eprints.iisc.ac.in/id/eprint/64059

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