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Title: Self-unitarization of New Higgs Inflation and compatibility with Planck and BICEP2 data

Abstract

In this paper we show that the Germani-Kehagias model of Higgs inflation (or New Higgs Inflation), where the Higgs boson is kinetically non-minimally coupled to the Einstein tensor is in perfect compatibility with the latest Planck and BICEP2 data. Moreover, we show that the tension between the Planck and BICEP2 data can be relieved within the New Higgs inflation scenario by a negative running of the spectral index. Regarding the unitarity of the model, we argue that it is unitary throughout the evolution of the Universe. Weak couplings in the Higgs-Higgs and Higgs-graviton sectors are provided by a large background dependent cut-off scale during inflation. In the same regime, the W and Z gauge bosons acquire a very large mass, thus decouple. On the other hand, if they are also non-minimally coupled to the Higgs boson, their effective masses can be enormously reduced. In this case, the W and Z bosons are no longer decoupled. After inflation, the New Higgs model is well approximated by a quartic Galileon with a renormalizable potential. We argue that this can unitarily create the right conditions for inflation to eventually start.

Authors:
;  [1];  [2]
  1. Arnold Sommerfeld Center, Ludwig-Maximilians-Universität, Theresienstr. 37, 80333 München (Germany)
  2. Research Center for the Early Universe, University of Tokyo, Tokyo 113-0033 (Japan)
Publication Date:
OSTI Identifier:
22382091
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2014; Journal Issue: 12; 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; APPROXIMATIONS; COSMOLOGICAL INFLATION; HIGGS BOSONS; HIGGS MODEL; MASS; POTENTIALS; RENORMALIZATION; TENSORS; UNITARITY; UNIVERSE; Z NEUTRAL BOSONS

Citation Formats

Germani, Cristiano, Wintergerst, Nico, and Watanabe, Yuki. Self-unitarization of New Higgs Inflation and compatibility with Planck and BICEP2 data. United States: N. p., 2014. Web. doi:10.1088/1475-7516/2014/12/009.
Germani, Cristiano, Wintergerst, Nico, & Watanabe, Yuki. Self-unitarization of New Higgs Inflation and compatibility with Planck and BICEP2 data. United States. https://doi.org/10.1088/1475-7516/2014/12/009
Germani, Cristiano, Wintergerst, Nico, and Watanabe, Yuki. 2014. "Self-unitarization of New Higgs Inflation and compatibility with Planck and BICEP2 data". United States. https://doi.org/10.1088/1475-7516/2014/12/009.
@article{osti_22382091,
title = {Self-unitarization of New Higgs Inflation and compatibility with Planck and BICEP2 data},
author = {Germani, Cristiano and Wintergerst, Nico and Watanabe, Yuki},
abstractNote = {In this paper we show that the Germani-Kehagias model of Higgs inflation (or New Higgs Inflation), where the Higgs boson is kinetically non-minimally coupled to the Einstein tensor is in perfect compatibility with the latest Planck and BICEP2 data. Moreover, we show that the tension between the Planck and BICEP2 data can be relieved within the New Higgs inflation scenario by a negative running of the spectral index. Regarding the unitarity of the model, we argue that it is unitary throughout the evolution of the Universe. Weak couplings in the Higgs-Higgs and Higgs-graviton sectors are provided by a large background dependent cut-off scale during inflation. In the same regime, the W and Z gauge bosons acquire a very large mass, thus decouple. On the other hand, if they are also non-minimally coupled to the Higgs boson, their effective masses can be enormously reduced. In this case, the W and Z bosons are no longer decoupled. After inflation, the New Higgs model is well approximated by a quartic Galileon with a renormalizable potential. We argue that this can unitarily create the right conditions for inflation to eventually start.},
doi = {10.1088/1475-7516/2014/12/009},
url = {https://www.osti.gov/biblio/22382091}, journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 12,
volume = 2014,
place = {United States},
year = {Mon Dec 01 00:00:00 EST 2014},
month = {Mon Dec 01 00:00:00 EST 2014}
}