Higgs-like spectator field as the origin of structure

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dc.contributor.author Karam, Alexandros
dc.contributor.author Markkanen, Tommi
dc.contributor.author Marzola, Luca
dc.contributor.author Nurmi, Sami
dc.contributor.author Raidal, Martti
dc.contributor.author Rajantie, Arttu
dc.date.accessioned 2021-09-29T13:13:01Z
dc.date.available 2021-09-29T13:13:01Z
dc.date.issued 2021-07
dc.identifier.citation 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
dc.identifier.other PURE: 168846226
dc.identifier.other PURE UUID: 68741238-b7d9-4326-83b4-5c2cc4d0402c
dc.identifier.other WOS: 000680864900004
dc.identifier.other Scopus: 85110632132
dc.identifier.uri http://hdl.handle.net/10138/334713
dc.description.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. en
dc.format.extent 8
dc.language.iso eng
dc.relation.ispartof European Physical Journal C. Particles and Fields
dc.rights cc_by
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject 114 Physical sciences
dc.title Higgs-like spectator field as the origin of structure en
dc.type Article
dc.contributor.organization Helsinki Institute of Physics
dc.description.reviewstatus Peer reviewed
dc.relation.doi https://doi.org/10.1140/epjc/s10052-021-09417-w
dc.relation.issn 1434-6044
dc.rights.accesslevel openAccess
dc.type.version publishedVersion

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