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Aligned natural inflation in the Large Volume Scenario

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Title
Aligned natural inflation in the Large Volume Scenario
Author(s)
Stephen Angus; Kang-Sin Choi; Chang Sub Shin
Publication Date
2021-10-29
Journal
Journal of High Energy Physics, v.2021, no.10, pp.1 - 49
Publisher
Springer Science and Business Media Deutschland GmbH
Abstract
© 2021, The Author(s).We embed natural inflation in an explict string theory model and derive observables in cosmology. We achieve this by compactifying the type IIB string on a Calabi-Yau orientifold, stabilizing moduli via the Large Volume Scenario, and configuring axions using D7-brane stacks. In order to obtain a large effective decay constant, we employ the Kim-Nilles-Peloso alignment mechanism, with the required multiple axions arising naturally from generically anisotropic bulk geometries. The bulk volumes, and hence the axion decay constants, are stabilized by generalized one-loop corrections and subject to various conditions: the Kähler cone condition on the string geometry; the convex hull condition of the weak gravity conjecture; and the constraint from the power spectrum of scalar perturbations. We find that all constraints can be satisfied in a geometry with relatively small volume and thus heavy bulk axion mass. We also covariantize the convex hull condition for the axion-dilaton-instanton system and verify the normalization of the extremal bound.
URI
https://pr.ibs.re.kr/handle/8788114/10864
DOI
10.1007/JHEP10(2021)248
ISSN
1126-6708
Appears in Collections:
Center for Fundamental Theory(순수물리이론 연구단) > 1. Journal Papers (저널논문)
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