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Gundhi, Anirudh and Steinwachs, Christian F. (2020). Scalaron-Higgs inflation. Nucl. Phys. B, 954. AMSTERDAM: ELSEVIER. ISSN 1873-1562

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Abstract

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 lambda 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 lambda. 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 lambda 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. (C) 2020 The Author(s). Published by Elsevier B.V.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Gundhi, Anirudh UNSPECIFIED UNSPECIFIED UNSPECIFIED Steinwachs, Christian F. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-335795
DOI:	10.1016/j.nuclphysb.2020.114989
Journal or Publication Title:	Nucl. Phys. B
Volume:	954
Date:	2020
Publisher:	ELSEVIER
Place of Publication:	AMSTERDAM
ISSN:	1873-1562
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language BROKEN-SYMMETRIC THEORY; COSMOLOGICAL PERTURBATIONS; MULTICOMPONENT INFLATON; DENSITY PERTURBATIONS; INITIAL CONDITIONS; EINSTEIN GRAVITY; FIELD; RENORMALIZATION; SPECTRUM; GENERATION Multiple languages Physics, Particles & Fields Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/33579