Chaotic inflation with kinetic alignment of axion fields

Bachlechner, Thomas C, Dias, Mafalda, Frazer, Jonathan and McAllister, Liam (2015) Chaotic inflation with kinetic alignment of axion fields. Physical Review D, 91 (2). ISSN 1550-7998

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N-flation is a radiatively stable scenario for chaotic inflation in which the displacements of N≫1 axions with decay constants f1≤…≤fN<MP lead to a super-Planckian effective displacement equal to the Pythagorean sum fPy of the fi. We show that mixing in the axion kinetic term generically leads to the phenomenon of kinetic alignment, allowing for effective displacements as large as N−−√fN≥fPy, even if f1,…,fN−1 are arbitrarily small. At the level of kinematics, the necessary alignment occurs with very high probability, because of eigenvector delocalization. We present conditions under which inflation can take place along an aligned direction. Our construction sharply reduces the challenge of realizing N-flation in string theory.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Depositing User: Nikoleta Kiapidou
Date Deposited: 29 Jun 2015 12:52
Last Modified: 02 Jul 2019 23:51

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