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Title: Unitarity-violation in generalized Higgs inflation models

Abstract

Unitarity-violation presents a challenge for non-minimally coupled models of inflation based on weak-scale particle physics. We examine the energy scale of tree-level unitarity-violation in scattering processes for generalized models with multiple scalar fields where the inflaton is either a singlet scalar or the Higgs. In the limit that the non-minimal couplings are all equal (e.g. in the case of Higgs or other complex inflaton), the scale of tree-level unitarity-violation matches the existing result. However if the inflaton is a singlet, and if it has a larger non-minimal coupling than other scalars in the model, then this hierarchy increases the scale of tree-level unitarity-violation. A sufficiently strong hierarchy pushes the scale of tree-level unitarity-violation above the Planck scale. We also discuss models which attempt to resolve the issue of unitarity-violation in Higgs Inflation.

Authors:
 [1];  [2]
  1. Physics Department and Helsinki Institute of Physics, University of Helsinki, P.O. Box 64, FI-00014, Helsinki (Finland)
  2. Consortium for Fundamental Physics, Cosmology and Astroparticle Physics Group, Department of Physics, Lancaster University, LA1 4YB (United Kingdom)
Publication Date:
OSTI Identifier:
22279709
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2012; Journal Issue: 11; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTROPHYSICS; COSMOLOGY; HIGGS BOSONS; HIGGS MODEL; INFLATIONARY UNIVERSE; INFLATONS; SCALAR FIELDS; SCATTERING; UNITARITY

Citation Formats

Lerner, Rose N., and McDonald, John, E-mail: rose.lerner@helsinki.fi, E-mail: j.mcdonald@lancaster.ac.uk. Unitarity-violation in generalized Higgs inflation models. United States: N. p., 2012. Web. doi:10.1088/1475-7516/2012/11/019.
Lerner, Rose N., & McDonald, John, E-mail: rose.lerner@helsinki.fi, E-mail: j.mcdonald@lancaster.ac.uk. Unitarity-violation in generalized Higgs inflation models. United States. doi:10.1088/1475-7516/2012/11/019.
Lerner, Rose N., and McDonald, John, E-mail: rose.lerner@helsinki.fi, E-mail: j.mcdonald@lancaster.ac.uk. Thu . "Unitarity-violation in generalized Higgs inflation models". United States. doi:10.1088/1475-7516/2012/11/019.
@article{osti_22279709,
title = {Unitarity-violation in generalized Higgs inflation models},
author = {Lerner, Rose N. and McDonald, John, E-mail: rose.lerner@helsinki.fi, E-mail: j.mcdonald@lancaster.ac.uk},
abstractNote = {Unitarity-violation presents a challenge for non-minimally coupled models of inflation based on weak-scale particle physics. We examine the energy scale of tree-level unitarity-violation in scattering processes for generalized models with multiple scalar fields where the inflaton is either a singlet scalar or the Higgs. In the limit that the non-minimal couplings are all equal (e.g. in the case of Higgs or other complex inflaton), the scale of tree-level unitarity-violation matches the existing result. However if the inflaton is a singlet, and if it has a larger non-minimal coupling than other scalars in the model, then this hierarchy increases the scale of tree-level unitarity-violation. A sufficiently strong hierarchy pushes the scale of tree-level unitarity-violation above the Planck scale. We also discuss models which attempt to resolve the issue of unitarity-violation in Higgs Inflation.},
doi = {10.1088/1475-7516/2012/11/019},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 11,
volume = 2012,
place = {United States},
year = {2012},
month = {11}
}