Axion inflation with cross-correlated axion isocurvature perturbations

Journal Article · Mon Jan 25 00:00:00 EST 2016 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2016/01/044· OSTI ID:22458430

Kadota, Kenji ^[1]; Kobayashi, Tatsuo ^[2]; Otsuka, Hajime ^[3]

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1. Center for Theoretical Physics of the Universe, Institute for Basic Science,Daejeon 305-811 (Korea, Republic of)
2. Department of Physics, Hokkaido University,Sapporo 060-0810 (Japan)
3. Department of Physics, Waseda University,Tokyo 169-8555 (Japan)

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.

• Sponsoring Organization: SCOAP3, CERN, Geneva (Switzerland)
• OSTI ID: 22458430
• Journal Information: Journal of Cosmology and Astroparticle Physics, Vol. 2016, Issue 01; Other Information: PUBLISHER-ID: JCAP01(2016)044; OAI: oai:repo.scoap3.org:13613; Article funded by SCOAP3. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 License. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AXIONS
CORRELATION FUNCTIONS
COSMOLOGICAL INFLATION
DISTURBANCES
SUPERSTRING THEORY