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Title: Inflection point inflation within supersymmetry

Abstract

We propose to address the fine tuning problem of inflection point inflation by the addition of extra vacuum energy that is present during inflation but disappears afterwards. We show that in such a case, the required amount of fine tuning is greatly reduced. We suggest that the extra vacuum energy can be associated with an earlier phase transition and provide a simple model, based on extending the SM gauge group to SU(3){sub C} × SU(2){sub L} × U(1){sub Y} × U(1){sub B−L}, where the Higgs field of U(1){sub B−L} is in a false vacuum during inflation. In this case, there is virtually no fine tuning of the soft SUSY breaking parameters of the flat direction which serves as the inflaton. However, the absence of radiative corrections which would spoil the flatness of the inflaton potential requires that the U(1){sub B−L} gauge coupling should be small with g{sub B−L} ≤ 10{sup −4}.

Authors:
 [1]; ;  [2]
  1. Physics Department and Helsinki Institute of Physics, FI-00014 University of Helsinki (Finland)
  2. Physics Department, Lancaster University, Lancaster, LA1 4YB (United Kingdom)
Publication Date:
OSTI Identifier:
22272920
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2010; Journal Issue: 06; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; COSMOLOGY; COUPLING; HIGGS BOSONS; HIGGS MODEL; INFLATIONARY UNIVERSE; INFLATONS; PHASE TRANSFORMATIONS; POTENTIALS; RADIATIVE CORRECTIONS; SU-2 GROUPS; SU-3 GROUPS; SUPERSYMMETRY; SYMMETRY BREAKING; U-1 GROUPS

Citation Formats

Enqvist, Kari, Mazumdar, Anupam, and Stephens, Philip. Inflection point inflation within supersymmetry. United States: N. p., 2010. Web. doi:10.1088/1475-7516/2010/06/020.
Enqvist, Kari, Mazumdar, Anupam, & Stephens, Philip. Inflection point inflation within supersymmetry. United States. https://doi.org/10.1088/1475-7516/2010/06/020
Enqvist, Kari, Mazumdar, Anupam, and Stephens, Philip. Tue . "Inflection point inflation within supersymmetry". United States. https://doi.org/10.1088/1475-7516/2010/06/020.
@article{osti_22272920,
title = {Inflection point inflation within supersymmetry},
author = {Enqvist, Kari and Mazumdar, Anupam and Stephens, Philip},
abstractNote = {We propose to address the fine tuning problem of inflection point inflation by the addition of extra vacuum energy that is present during inflation but disappears afterwards. We show that in such a case, the required amount of fine tuning is greatly reduced. We suggest that the extra vacuum energy can be associated with an earlier phase transition and provide a simple model, based on extending the SM gauge group to SU(3){sub C} × SU(2){sub L} × U(1){sub Y} × U(1){sub B−L}, where the Higgs field of U(1){sub B−L} is in a false vacuum during inflation. In this case, there is virtually no fine tuning of the soft SUSY breaking parameters of the flat direction which serves as the inflaton. However, the absence of radiative corrections which would spoil the flatness of the inflaton potential requires that the U(1){sub B−L} gauge coupling should be small with g{sub B−L} ≤ 10{sup −4}.},
doi = {10.1088/1475-7516/2010/06/020},
url = {https://www.osti.gov/biblio/22272920}, journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 06,
volume = 2010,
place = {United States},
year = {2010},
month = {6}
}