Higgs-like spectator field as the origin of structure

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Karam , A , Markkanen , T , Marzola , L , Nurmi , S , Raidal , M & Rajantie , A 2021 , ' Higgs-like spectator field as the origin of structure ' , European Physical Journal C. Particles and Fields , vol. 81 , no. 7 , 620 . https://doi.org/10.1140/epjc/s10052-021-09417-w

Titel: Higgs-like spectator field as the origin of structure
Författare: Karam, Alexandros; Markkanen, Tommi; Marzola, Luca; Nurmi, Sami; Raidal, Martti; Rajantie, Arttu
Upphovmannens organisation: Helsinki Institute of Physics
Datum: 2021-07
Språk: eng
Sidantal: 8
Tillhör serie: European Physical Journal C. Particles and Fields
ISSN: 1434-6044
DOI: https://doi.org/10.1140/epjc/s10052-021-09417-w
Permanenta länken (URI): http://hdl.handle.net/10138/334713
Abstrakt: We show that the observed primordial perturbations can be entirely sourced by a light spectator scalar field with a quartic potential, akin to the Higgs boson, provided that the field is sufficiently displaced from vacuum during inflation. The framework relies on the indirect modulation of reheating, which is implemented without any direct coupling between the spectator field and the inflaton and does not require non-renormalisable interactions. The scenario gives rise to local non-Gaussianity with fNL similar or equal to 5 as the typical signal. As an example model where the indirect modulation mechanism is realised for the Higgs boson, we study the Standard Model extended with right-handed neutrinos. For the Standard Model running we find, however, that the scenario analysed does not seem to produce the observed perturbation.
Subject: 114 Physical sciences
Referentgranskad: Ja
Licens: cc_by
Användningsbegränsning: openAccess
Parallelpublicerad version: publishedVersion

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