Observational constraints on decoupled hidden sectors

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Heikinheimo , M , Tenkanen , T , Tuominen , K & Vaskonen , V 2016 , ' Observational constraints on decoupled hidden sectors ' , Physical Review D , vol. 94 , no. 6 , 063506 . https://doi.org/10.1103/PhysRevD.94.063506

Title: Observational constraints on decoupled hidden sectors
Author: Heikinheimo, Matti; Tenkanen, Tommi; Tuominen, Kimmo; Vaskonen, Ville
Contributor: University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Date: 2016-09-08
Language: eng
Number of pages: 10
Belongs to series: Physical Review D
ISSN: 2470-0010
URI: http://hdl.handle.net/10138/183655
Abstract: 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.
Subject: INTERACTING DARK-MATTER
GALAXY CLUSTER 1E-0657-56
INTERACTION CROSS-SECTION
3.5 KEV LINE
COSMOLOGICAL SIMULATIONS
ABELL 3827
114 Physical sciences
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