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Title: Quasi-single field inflation in the non-perturbative regime

Abstract

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 μ ∙ π S, 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. In conclusion 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.

Authors:
 [1];  [1];  [1];  [1]
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  1. California Inst. of Technology (CalTech), Pasadena, CA (United States). Walter Burke Institute for Theoretical Physics
Publication Date:
Research Org.:
California Institute of Technology (CalTech), Pasadena, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
OSTI Identifier:
1501459
Grant/Contract Number:  
SC0011632
Resource Type:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2018; Journal Issue: 6; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 79 ASTRONOMY AND ASTROPHYSICS; Cosmology of Theories beyond the SM; Effective Field Theories

Citation Formats

An, Haipeng, McAneny, Michael, Ridgway, Alexander K., and Wise, Mark B. Quasi-single field inflation in the non-perturbative regime. United States: N. p., 2018. Web. doi:10.1007/jhep06(2018)105.
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An, Haipeng, McAneny, Michael, Ridgway, Alexander K., & Wise, Mark B. Quasi-single field inflation in the non-perturbative regime. United States. https://doi.org/10.1007/jhep06(2018)105
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An, Haipeng, McAneny, Michael, Ridgway, Alexander K., and Wise, Mark B. Wed . "Quasi-single field inflation in the non-perturbative regime". United States. https://doi.org/10.1007/jhep06(2018)105. https://www.osti.gov/servlets/purl/1501459.
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@article{osti_1501459,
title = {Quasi-single field inflation in the non-perturbative regime},
author = {An, Haipeng and McAneny, Michael and Ridgway, Alexander K. and Wise, Mark B.},
abstractNote = {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 μ∙πS, 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. In conclusion 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.},
doi = {10.1007/jhep06(2018)105},
journal = {Journal of High Energy Physics (Online)},
number = 6,
volume = 2018,
place = {United States},
year = {Wed Jun 20 00:00:00 EDT 2018},
month = {Wed Jun 20 00:00:00 EDT 2018}
}
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https://doi.org/10.1007/jhep06(2018)105
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