Scalaron-Higgs inflation
In scalaron-Higgs inflation the Standard Model Higgs boson is non-minimally coupled to gravity and the Einstein-Hilbert action is supplemented by the quadratic scalar curvature invariant. For the quartic Higgs self-coupling λ fixed at the electroweak scale, we find that the resulting inflationary tw...
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doaj-c66f336343b44985be932115a2add1782020-11-25T02:54:17ZengElsevierNuclear Physics B0550-32132020-05-01954Scalaron-Higgs inflationAnirudh Gundhi0Christian F. Steinwachs1Institut für Theoretische Physik, Universität zu Köln, Zülpicher Straße 77, 50937 Köln, GermanyPhysikalisches Institut, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg, Germany; Corresponding author.In scalaron-Higgs inflation the Standard Model Higgs boson is non-minimally coupled to gravity and the Einstein-Hilbert action is supplemented by the quadratic scalar curvature invariant. For the quartic Higgs self-coupling λ fixed at the electroweak scale, we find that the resulting inflationary two-field model effectively reduces to a single field model with the same predictions as in Higgs inflation or Starobinsky inflation, including the limit of a vanishing non-minimal coupling. For the same model, but with the scalar field a priori not identified with the Standard Model Higgs boson, we study the inflationary consequences of an extremely small λ. Depending on the initial conditions for the inflationary background trajectories, we find that the two-field dynamics either again reduces to an effective single-field model with a larger tensor-to-scalar ratio than predicted in Higgs inflation and Starobinsky inflation, or involves the full two-field dynamics and leads to oscillatory features in the inflationary power spectrum. Finally, we investigate under which conditions the inflationary scenario with extremely small λ can be realized dynamically by the Standard Model renormalization group flow and discuss how the scalaron-Higgs model can provide a natural way to stabilize the electroweak vacuum.http://www.sciencedirect.com/science/article/pii/S0550321320300754 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Anirudh Gundhi Christian F. Steinwachs |
spellingShingle |
Anirudh Gundhi Christian F. Steinwachs Scalaron-Higgs inflation Nuclear Physics B |
author_facet |
Anirudh Gundhi Christian F. Steinwachs |
author_sort |
Anirudh Gundhi |
title |
Scalaron-Higgs inflation |
title_short |
Scalaron-Higgs inflation |
title_full |
Scalaron-Higgs inflation |
title_fullStr |
Scalaron-Higgs inflation |
title_full_unstemmed |
Scalaron-Higgs inflation |
title_sort |
scalaron-higgs inflation |
publisher |
Elsevier |
series |
Nuclear Physics B |
issn |
0550-3213 |
publishDate |
2020-05-01 |
description |
In scalaron-Higgs inflation the Standard Model Higgs boson is non-minimally coupled to gravity and the Einstein-Hilbert action is supplemented by the quadratic scalar curvature invariant. For the quartic Higgs self-coupling λ fixed at the electroweak scale, we find that the resulting inflationary two-field model effectively reduces to a single field model with the same predictions as in Higgs inflation or Starobinsky inflation, including the limit of a vanishing non-minimal coupling. For the same model, but with the scalar field a priori not identified with the Standard Model Higgs boson, we study the inflationary consequences of an extremely small λ. Depending on the initial conditions for the inflationary background trajectories, we find that the two-field dynamics either again reduces to an effective single-field model with a larger tensor-to-scalar ratio than predicted in Higgs inflation and Starobinsky inflation, or involves the full two-field dynamics and leads to oscillatory features in the inflationary power spectrum. Finally, we investigate under which conditions the inflationary scenario with extremely small λ can be realized dynamically by the Standard Model renormalization group flow and discuss how the scalaron-Higgs model can provide a natural way to stabilize the electroweak vacuum. |
url |
http://www.sciencedirect.com/science/article/pii/S0550321320300754 |
work_keys_str_mv |
AT anirudhgundhi scalaronhiggsinflation AT christianfsteinwachs scalaronhiggsinflation |
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