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Quasi-single field inflation in the non-perturbative regime

An, Haipeng and McAneny, Michael and Ridgway, Alexander K. and Wise, Mark B. (2018) Quasi-single field inflation in the non-perturbative regime. Journal of High Energy Physics, 2018 (6). Art. No. 105. ISSN 1126-6708. doi:10.1007/JHEP06(2018)105.

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In quasi-single field inflation there are massive fields that interact with the inflaton field. If these other fields are not much heavier than the Hubble constant during inflation (H) these interactions can lead to important consequences for the cosmological energy density perturbations. The simplest model of this type has a real scalar inflaton field that interacts with another real scalar S (with mass m). In this model there is a mixing term of the form μπS, where π is the Goldstone fluctuation that is associated with the breaking of time translation invariance by the time evolution of the inflaton field during the inflationary era. In this paper we study this model in the region (μ/H)^2 + (m/H)^2 > 9/4 and m/H∼O(1) or less. For a large part of the parameter space in this region standard perturbative methods are not applicable. Using numerical and analytic methods we study how large μ/H has to be for the large μ/H effective field theory approach to be applicable.

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Additional Information:© 2018 The Authors. 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. Article funded by SCOAP3. Received: February 2, 2018; Accepted: June 8, 2018; Published: June 20, 2018. HA would like to thank Asimina Arvanitaki, Cliff Burgess and Yi Wang for useful comments and discussions. This work was supported by the DOE Grant DE-SC0011632. We are also grateful for the support provided by the Walter Burke Institute for Theoretical Physics.
Group:Walter Burke Institute for Theoretical Physics
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Department of Energy (DOE)DE-SC0011632
Walter Burke Institute for Theoretical Physics, CaltechUNSPECIFIED
Subject Keywords:Cosmology of Theories beyond the SM; Effective Field Theories
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Issue or Number:6
Record Number:CaltechAUTHORS:20170721-093214273
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Official Citation:An, H., McAneny, M., Ridgway, A.K. et al. J. High Energ. Phys. (2018) 2018: 105.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:79267
Deposited By: Joy Painter
Deposited On:21 Jul 2017 17:07
Last Modified:15 Nov 2021 17:46

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