Imperial College London
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ProfessorArttuRajantie

Faculty of Natural Sciences, Department of Physics

Professor of Theoretical Physics
 
 
 
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Contact

 

+44 (0)20 7594 7835a.rajantie Website CV

 
 
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Location

 

605Huxley BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Karam:2021:epjc/s10052-021-09417-w,
author = {Karam, A and Markkanen, T and Marzola, L and Nurmi, S and Raidal, M and Rajantie, A},
doi = {epjc/s10052-021-09417-w},
journal = {European Physical Journal C: Particles and Fields},
title = {Higgs-like spectator field as the origin of structure},
url = {http://dx.doi.org/10.1140/epjc/s10052-021-09417-w},
volume = {81},
year = {2021}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - 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 fNL5 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.
AU  - Karam,A
AU  - Markkanen,T
AU  - Marzola,L
AU  - Nurmi,S
AU  - Raidal,M
AU  - Rajantie,A
DO  - epjc/s10052-021-09417-w
PY  - 2021///
SN  - 1124-1861
TI  - Higgs-like spectator field as the origin of structure
T2  - European Physical Journal C: Particles and Fields
UR  - http://dx.doi.org/10.1140/epjc/s10052-021-09417-w
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000680864900004&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - https://link.springer.com/article/10.1140/epjc/s10052-021-09417-w
UR  - http://hdl.handle.net/10044/1/96434
VL  - 81
ER  -
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