Axion monodromy inflation with warped KK-modes

DOI10.1016/J.PHYSLETB.2016.01.030zbMATH Open1366.83095arXiv1512.04463OpenAlexW2203703183MaRDI QIDQ2362732

Author name not available (Why is that?)

Publication date: 11 July 2017

Published in: (Search for Journal in Brave)

Abstract: We present a particularly simple model of axion monodromy: Our axion is the lowest-lying KK-mode of the RR-2-form-potential

C_{2}

in the standard Klebanov-Strassler throat. One can think of this inflaton candidate as being defined by the integral of

C_{2}

over the

S^{2}

cycle of the throat. It obtains an exponentially small mass from the IR-region in which the

S^{2}

shrinks to zero size both with respect to the Planck scale and the mass scale of local modes of the throat. Crucially, the

S^{2}

cycle has to be shared between two throats, such that the second locus where the

S^{2}

shrinks is also in a warped region. Well-known problems like the potentially dangerous back-reaction of brane/antibrane pairs and explicit supersymmetry breaking are not present in our scenario. However, the inflaton back-reaction starts to deform the geometry strongly once the field excursion approaches the Planck scale. We derive the system of differential equations required to treat this effect quantitatively. Numerical work is required to decide whether back-reaction makes the model suitable for realistic inflation. While we have to leave this crucial issue to future studies, we find it interesting that such a simple and explicit stringy monodromy model allows an originally sub-Planckian axion to go through many periods with full quantitative control before back-reaction becomes strong. Also, the mere existence of our ultra-light throat mode (with double exponentially suppressed mass) is noteworthy.

Full work available at URL: https://arxiv.org/abs/1512.04463

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