6533b831fe1ef96bd1299b6c
RESEARCH PRODUCT
Observational constraints on decoupled hidden sectors
Kimmo TuominenKimmo TuominenMatti HeikinheimoMatti HeikinheimoTommi TenkanenTommi TenkanenVille VaskonenVille Vaskonensubject
Particle physicsCosmology and Nongalactic Astrophysics (astro-ph.CO)Dark matterScalar (mathematics)FOS: Physical sciencesParameter space114 Physical sciences01 natural sciencesStandard Modeldecouplingsymbols.namesakeHigh Energy Physics - Phenomenology (hep-ph)ABELL 38270103 physical sciencesSinglet state010306 general physicsdark matter abundanceInflation (cosmology)PhysicsINTERACTING DARK-MATTERta114010308 nuclear & particles physicsHigh Energy Physics::Phenomenologyextensions of the Standard ModelHidden sectorHigh Energy Physics - Phenomenologysinglet sectorCOSMOLOGICAL SIMULATIONSDirac fermionGALAXY CLUSTER 1E-0657-56symbols3.5 KEV LINEINTERACTION CROSS-SECTIONAstrophysics - Cosmology and Nongalactic Astrophysicsdescription
We consider an extension of the Standard Model with a singlet sector consisting of a real (pseudo)scalar and a Dirac fermion coupled with the Standard Model only via the scalar portal. We assume that the portal coupling is weak enough for the singlet sector not to thermalize with the Standard Model allowing the production of singlet particles via the freeze-in mechanism. If the singlet sector interacts with itself sufficiently strongly, it may thermalize within itself, resulting in dark matter abundance determined by the freeze-out mechanism operating within the singlet sector. We investigate this scenario in detail. In particular, we show that requiring the absence of inflationary isocurvature fluctuations provides lower bounds on the magnitude of the dark sector self-interactions and in parts of the parameter space favors sufficiently large self-couplings, supported also by the features observed in the small-scale structure formation.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2016-09-08 | Physical Review D |