A1 Journal article (refereed)
Higgs-like spectator field as the origin of structure (2021)
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, 81(7), Article 620. https://doi.org/10.1140/epjc/s10052-021-09417-w
JYU authors or editors
Publication details
All authors or editors: Karam, Alexandros; Markkanen, Tommi; Marzola, Luca; Nurmi, Sami; Raidal, Martti; Rajantie, Arttu
Journal or series: European Physical Journal C
ISSN: 1434-6044
eISSN: 1434-6052
Publication year: 2021
Volume: 81
Issue number: 7
Article number: 620
Publisher: Springer Science and Business Media LLC
Publication country: Netherlands
Publication language: English
DOI: https://doi.org/10.1140/epjc/s10052-021-09417-w
Publication open access: Openly available
Publication channel open access: Open Access channel
Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/77169
Web address of parallel published publication (pre-print): https://arxiv.org/abs/2103.02569
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≃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.
Keywords: cosmology; cosmic inflation; cosmic background radiation; standard model of particle physics; Higgs bosons
Contributing organizations
Ministry reporting: Yes
Reporting Year: 2021
JUFO rating: 2
