Aligned natural inflation in the Large Volume Scenario
- 주제(키워드) Cosmology of Theories beyond the SM , Flux compactifications
- 주제(기타) Physics, Particles & Fields
- 설명문(일반) [Angus, Stephen] Postech, Asia Pacific Ctr Theoret Phys, Pohang 37673, South Korea; [Choi, Kang-Sin] Ewha Womans Univ, Inst Math Sci, Seoul 03760, South Korea; [Choi, Kang-Sin] Ewha Womans Univ, Scranton Honors Program, Seoul 03760, South Korea; [Shin, Chang Sub] Chungnam Natl Univ, Dept Phys, Daejeon 34134, South Korea; [Shin, Chang Sub] Chungnam Natl Univ, Inst Quantum Syst IQS, Daejeon 34134, South Korea; [Shin, Chang Sub] Inst for Basic Sci Korea, Ctr Theoret Phys Universe, Daejeon 34126, South Korea
- 등재 SCIE, SCOPUS
- OA유형 gold, Green Submitted
- 발행기관 SPRINGER
- 발행년도 2021
- URI http://www.dcollection.net/handler/ewha/000000183805
- 본문언어 영어
- Published As http://dx.doi.org/10.1007/JHEP10(2021)248
초록/요약
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.
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