6533b85efe1ef96bd12bf349
RESEARCH PRODUCT
Higgs-like spectator field as the origin of structure
Martti RaidalLuca MarzolaTommi MarkkanenTommi MarkkanenArttu RajantieAlexandros KaramSami NurmiSami Nurmisubject
Particle physicsCosmology and Nongalactic Astrophysics (astro-ph.CO)Physics and Astronomy (miscellaneous)Field (physics)FOS: Physical sciencesQC770-798Astrophysics::Cosmology and Extragalactic AstrophysicsAstrophysicskosmologia01 natural sciences7. Clean energy114 Physical sciencesPhysics Particles & FieldsStandard ModelHigh Energy Physics - Phenomenology (hep-ph)Nuclear and particle physics. Atomic energy. RadioactivityQuartic function0103 physical sciences0206 Quantum Physics010303 astronomy & astrophysicsEngineering (miscellaneous)kosminen inflaatioInflation (cosmology)PhysicsScience & Technology010308 nuclear & particles physicsPhysicsHiggsin bosoniHigh Energy Physics::Phenomenologyhiukkasfysiikan standardimallihep-phInflatonPERTURBATIONSNuclear & Particles PhysicsQB460-466High Energy Physics - Phenomenologykosminen taustasäteilyPhysical Sciences0202 Atomic Molecular Nuclear Particle and Plasma Physicsastro-ph.COHiggs bosonNeutrinoScalar fieldAstrophysics - Cosmology and Nongalactic Astrophysicsdescription
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 $f_{\rm NL}\simeq 5$ 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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2021-07-01 | The European Physical Journal C |