Journal of High Energy Physics

, Volume 2015, Issue 12, pp 1–18 | Cite as

Pole inflation — Shift symmetry and universal corrections

  • B.J. BroyEmail author
  • M. Galante
  • D. Roest
  • A. Westphal
Open Access
Regular Article - Theoretical Physics


An appealing explanation for the Planck data is provided by inflationary mod els with a singular non-canonical kinetic term: a Laurent expansion of the kinetic function translates into a potential with a nearly shift-symmetric plateau in canonical fields. The shift symmetry can be broken at large field values by including higher-order poles, which need to be hierarchically suppressed in order not to spoil the inflationary plateau. The herefrom resulting corrections to the inflationary dynamics and predictions are shown to be universal at lowest order and possibly to induce power loss at large angular scales. At lowest order there are no corrections from a pole of just one order higher and we argue that this phenomenon is related to the well-known extended no-scale structure arising in string theory scenarios. Finally, we outline which other corrections may arise from string loop effects.


Cosmology of Theories beyond the SM Classical Theories of Gravity Effective field theories 


Open Access

This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.


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Copyright information

© The Author(s) 2015

Authors and Affiliations

  1. 1.Deutsches Elektronen-Synchrotron DESY, Theory GroupHamburgGermany
  2. 2.Van Swinderen Institute for Particle Physics and GravityUniversity of GroningenGroningenThe Netherlands

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