Higgs-like spectator field as the origin of structure
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
Published inEuropean Physical Journal C
© The Author(s) 2021
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.
PublisherSpringer Science and Business Media LLC
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Additional information about fundingThis work was supported by the EU Marie Curie grant 786564, the European Regional Development Fund through the CoE program grant TK133, the Mobilitas Pluss grants MOBTT5, MOBTT86, and the Estonian Research Council grants PRG356, PRG1055 and PRG803. A.R. was supported by the U.K. Science and Technology Facilities Council grants ST/P000762/1 and ST/T000791/1 and Institute for Particle Physics Phenomenology Associateship. ...
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