A1 Journal article (refereed)
Self-interacting dark matter and cosmology of a light scalar mediator (2016)

Kainulainen, K., Tuominen, K., & Vaskonen, V. (2016). Self-interacting dark matter and cosmology of a light scalar mediator. Physical Review D, 93(1), Article 015016. https://doi.org/10.1103/PhysRevD.93.015016

JYU authors or editors

Publication details

All authors or editors: Kainulainen, Kimmo; Tuominen, Kimmo; Vaskonen, Ville

Journal or series: Physical Review D

ISSN: 1550-7998

eISSN: 2470-0029

Publication year: 2016

Volume: 93

Issue number: 1

Article number: 015016

Publisher: American Physical Society

Publication country: United States

Publication language: English

DOI: https://doi.org/10.1103/PhysRevD.93.015016

Publication open access: Not open

Publication channel open access:

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/50175


We consider a fermionic dark matter candidate interacting via a scalar mediator coupled with the Standard Model through a Higgs portal. We consider a general setting including both scalar and pseudoscalar interactions between the scalar and fermion, and illustrate the relevant features for dark matter abundance, direct search limits and collider constraints. The case where dark matter has a self-interaction strength ⟨σV⟩/mψ∼0.1–1  cm2/g is strongly constrained, in particular by the big bang nucleosynthesis. We show that these constraints can be alleviated by introducing a new light sterile neutrino N. The allowed region for the extended model consists of two triangles as a function of the mass mN and a sufficiently small sterile-active neutrino mixing angle sinθ<0.00

Keywords: dark matter

Free keywords: fermions; scalar mediators; Standard Model; sterile neutrinos

Contributing organizations

Related projects

  • Dark Universe
      • Kainulainen, Kimmo
    • Research Council of Finland

Ministry reporting: Yes

Reporting Year: 2016

JUFO rating: 2

Last updated on 2023-03-10 at 12:54