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

Title: Higgs-like spectator field as the origin of structure
Author: Karam, Alexandros; Markkanen, Tommi; Marzola, Luca; Nurmi, Sami; Raidal, Martti; Rajantie, Arttu
Contributor organization: Helsinki Institute of Physics
Date: 2021-07
Language: eng
Number of pages: 8
Belongs to series: European Physical Journal C. Particles and Fields
ISSN: 1434-6044
DOI: https://doi.org/10.1140/epjc/s10052-021-09417-w
URI: http://hdl.handle.net/10138/334713
Abstract: 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
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion

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