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Higgs-inflaton mixing and vacuum stability
Univ Tokyo, Fac Sci, Dept Phys, Bunkyo Ku, Tokyo 1130033, Japan..
Univ Jyvaskyla, Dept Phys, POB 35 YFL, FI-40014 Jyvaskyla, Finland..
Univ Helsinki, POB 64, FI-00014 Helsinki, Finland.;Helsinki Inst Phys, POB 64, FI-00014 Helsinki, Finland..
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Stockholm Univ, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden..
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2019 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 789, p. 373-377Article in journal (Refereed) Published
Abstract [en]

The quartic and trilinear Higgs field couplings to an additional real scalar are renormalizable, gauge and Lorentz invariant. Thus, on general grounds, one expects such couplings between the Higgs and an inflaton in quantum field theory. We find that the often omitted trilinear interaction is only weakly constrained by cosmology and could stabilize the electroweak vacuum by increasing the Higgs self coupling. The consequent Higgs-inflaton mixing can be as large as order one making a direct inflaton search possible at the LHC. Published by Elsevier B.V. This is an open access article under the CC BY license.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2019. Vol. 789, p. 373-377
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Physical Sciences
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URN: urn:nbn:se:kth:diva-244089DOI: 10.1016/j.physletb.2018.10.074ISI: 000457165400051Scopus ID: 2-s2.0-85059336213OAI: oai:DiVA.org:kth-244089DiVA, id: diva2:1289889
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QC 20190219

Available from: 2019-02-19 Created: 2019-02-19 Last updated: 2019-02-19Bibliographically approved

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