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Natural inflation with multiple sub-Planckian axions

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Title
Natural inflation with multiple sub-Planckian axions
Author(s)
Kiwoon Choi; Hyungjin Kim; Seokhoon Yun
Publication Date
2014-07
Journal
PHYSICAL REVIEW D, v.90, no.2, pp.023545 -
Publisher
AMER PHYSICAL SOC
Abstract
We extend the Kim-Nilles-Peloso (KNP) alignment mechanism for natural inflation to models with N > 2 axions, which obtains super-Planckian effective axion decay constant feff ≫ MPl through an alignment of the anomaly coefficients of multiple axions having sub-Planckian fundamental decay constants f0 ≪ MPl. The original version of the KNP mechanism realized with two axions requires that some of the anomaly coefficients should be of the order of feff=f0, which would be uncomfortably large if feff=f0 ≳ Oð100Þ as suggested by the recent BICEP2 results. We note that the KNP mechanism can be realized with the anomaly coefficients of Oð1Þ if the number of axions N is large as N lnN ≳ 2 lnðfeff=f0Þ, in which case the effective ffiffiffiffiffiffi decay constant can be enhanced as feff=f0 ∼ N! p nN−1 for n denoting the typical size of the integer-valued anomaly coefficients. Comparing to the other multiple axion scenario, the N-flation scenario which requires N ∼ f2 eff=f20 , the KNP mechanism has a virtue of not invoking to a too large number of axions, although it requires a specific alignment of the anomaly coefficients, which can be achieved with a probability of Oðf0=feff Þ under a random choice of the anomaly coefficients.We also present a simple model realizing a multiple axion monodromy along the inflaton direction.
URI
http://pr.ibs.re.kr/handle/8788114/1493
DOI
10.1103/PhysRevD.90.023545
ISSN
1550-7998
Appears in Collections:
Center for Fundamental Theory(순수물리이론 연구단) > Journal Papers (저널논문)
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