Observational constraints on decoupled hidden sectors
Heikinheimo, M., Tenkanen, T., Tuominen, K., & Vaskonen, V. (2016). Observational constraints on decoupled hidden sectors. Physical Review D, 94(6), Article 063506. https://doi.org/10.1103/PhysRevD.94.063506
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Physical Review DDate
2016Copyright
© 2016 American Physical Society. Published in this repository with the kind permission of the publisher.
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.
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American Physical SocietyISSN Search the Publication Forum
1550-7998Publication in research information system
https://converis.jyu.fi/converis/portal/detail/Publication/26259247
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