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Aligned natural inflation in the Large Volume Scenario

Title
Aligned natural inflation in the Large Volume Scenario
Authors
Angus, StephenChoi, Kang-SinShin, Chang Sub
Ewha Authors
최강신
SCOPUS Author ID
최강신scopus
Issue Date
2021
Journal Title
JOURNAL OF HIGH ENERGY PHYSICS
ISSN
1029-8479JCR Link
Citation
JOURNAL OF HIGH ENERGY PHYSICS, no. 10
Keywords
Cosmology of Theories beyond the SMFlux compactifications
Publisher
SPRINGER
Indexed
SCIE; SCOPUS WOS
Document Type
Article
Abstract
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 Kahler 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.
DOI
10.1007/JHEP10(2021)248
Appears in Collections:
스크랜튼대학 > 스크랜튼학부 > Journal papers
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