6533b862fe1ef96bd12c6256
RESEARCH PRODUCT
Novel mechanism for primordial perturbations in minimal extensions of the Standard Model
Alexandros KaramArttu RajantieMartti RaidalSami NurmiSami NurmiLuca MarzolaTommi MarkkanenTommi Markkanensubject
Nuclear and High Energy PhysicsParticle physicsHiggs Physicshiukkasfysiikka114 Physical sciences01 natural sciencesUpper and lower boundsPhysics Particles & FieldsStandard Model0103 physical scienceslcsh:Nuclear and particle physics. Atomic energy. Radioactivity010306 general physicscosmology of theories beyond the SM0206 Quantum PhysicsPhysicsScience & Technology0105 Mathematical Physics010308 nuclear & particles physicsHiggsin bosoniPhysicshep-thHigh Energy Physics::PhenomenologyHiggs physicshep-phInflatonCosmology of Theories beyond the SMNuclear & Particles PhysicsAmplitudeOrders of magnitude (time)Phase spacePhysical Sciences0202 Atomic Molecular Nuclear Particle and Plasma Physicsastro-ph.COHiggs bosonlcsh:QC770-798Neutrinodescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2020-11-27 | Journal of High Energy Physics |