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Kenji Kadota
순수물리이론 연구단
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Axion inflation with cross-correlated axion isocurvature perturbations

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Title
Axion inflation with cross-correlated axion isocurvature perturbations
Author(s)
Kenji Kadota; Tatsuo Kobayashi; Hajime Otsuka
Publication Date
2016-01
Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, v.2016, no.1, pp.044 -
Publisher
IOP PUBLISHING LTD
Abstract
We study the inflation scenarios, in the framework of superstring theory, where the inflaton is an axion producing the adiabatic curvature perturbations while there exists another light axion producing the isocurvature perturbations. We discuss how the non-trivial couplings among string axions can generically arise, and calculate the consequent cross-correlations between the adiabatic and isocurvature modes through concrete examples. Based on the Planck analysis on the generally correlated isocurvature perturbations, we show that there is a preference for the existence of the correlated isocurvature modes for the axion monodromy inflation while the natural inflation disfavors such isocurvature modes.
URI
https://pr.ibs.re.kr/handle/8788114/2377
ISSN
1475-7516
Appears in Collections:
Center for Fundamental Theory(순수물리이론 연구단) > Journal Papers (저널논문)
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