Postinationary vacuum instability and Higgs-inflaton couplings
Enqvist, K., Karciauskas, M., Lebedev, O., Rusak, S., & Zatta, M. (2016). Postinationary vacuum instability and Higgs-inflaton couplings. Journal of Cosmology and Astroparticle Physics, 11, Article 025. https://doi.org/10.1088/1475-7516/2016/11/025
Julkaistu sarjassa
Journal of Cosmology and Astroparticle PhysicsPäivämäärä
2016Tekijänoikeudet
© the Authors, 2016. This is an open access article distributed under the terms of a Creative Commons License. Funded by SCOAP3.
The Higgs-inflaton coupling plays an important role in the Higgs field dynamics in the early Universe. Even a tiny coupling generated at loop level can have a dramatic effect on the fate of the electroweak vacuum. Such Higgs-inflaton interaction is present both at the trilinear and quartic levels in realistic reheating models. In this work, we examine the Higgs dynamics during the preheating epoch, focusing on the effects of the parametric and tachyonic resonances. We use lattice simulations and other numerical tools in our studies. We find that the resonances can induce large fluctuations of the Higgs field which destabilize the electroweak vacuum. Our considerations thus provide an upper bound on quartic and trilinear interactions between the Higgs and the inflaton. We conclude that there exists a favorable range of the couplings within which the Higgs field is stabilized during both inflation and preheating epochs.
Julkaisija
Institute of Physics Publishing Ltd.; Scuola Internazionale Superiore di Studi Avanzati (SISSA)ISSN Hae Julkaisufoorumista
1475-7516Asiasanat
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https://converis.jyu.fi/converis/portal/detail/Publication/26355727
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M.K. is supported by the Academy of Finland project 278722 and during the initial stages of this work was supported by JSPS as an International Research Fellow of the Japan Society for the Promotion of Science. O.L. and M.Z. acknowledge support from the Academy of Finland project “The Higgs and the Universe”.Lisenssi
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