Novel mechanism for primordial perturbations in minimal extensions of the Standard Model
Abstract
We demonstrate that light spectator fields in their equilibrium can source sizeable CMB anisotropies through modulated reheating even in the absence of direct couplings to the inflaton. The effect arises when the phase space of the inflaton decay is modulated by the spectator which generates masses for the decay products. We call the mechanism indirect modulation and using the stochastic eigenvalue expansion show that it can source perturbations even four orders of magnitude larger than the observed amplitude. Importantly, the indirect mechanism is present in the Standard Model extended with right- handed neutrinos. For a minimally coupled Higgs boson this leads to a novel lower bound on the quartic coupling and constrains the neutrino Yukawas below unity.
Main Authors
Format
Articles
Research article
Published
2020
Series
Subjects
Publication in research information system
Publisher
Springer
The permanent address of the publication
https://urn.fi/URN:NBN:fi:jyu-202012016859Use this for linking
Review status
Peer reviewed
ISSN
1126-6708
DOI
https://doi.org/10.1007/jhep11(2020)153
Language
English
Published in
Journal of High Energy Physics
Citation
- Karam, A., Markkanen, T., Marzola, L., Nurmi, S., Raidal, M., & Rajantie, A. (2020). Novel mechanism for primordial perturbations in minimal extensions of the Standard Model. Journal of High Energy Physics, 2020(11), Article 153. https://doi.org/10.1007/jhep11(2020)153
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Additional information about funding
This work was supported by the Estonian Research Council grants PRG356, PRG803, MOBTT86, MOBJD381, MOBTT5 and by the EU through the European Regional Development Fund CoE program TK133 “The Dark Side of the Universe”. This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No. 786564. AR was funded by the U.K. Science and Technology Facilities Council grant ST/P000762/1 and Institute for Particle Physics Phenomenology Associateship.
Copyright© The Authors. Article funded by SCOAP3