2016/01/31 by Kimmo Kainulainen, Sami Nurmi, Tommi Tenkanen +2 · 1 citation
Physics and Astronomy · #Astrophysics #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark matter #Inflation (cosmology) #Neutrino #Particle physics #Particle physics theoretical and experimental studies #Physics #Physics beyond the Standard Model #Planck #Pseudoscalar #Quark #Scalar (mathematics) #Standard Model (mathematical formulation) #Theoretical physics #Yukawa potential #astro-ph.CO #hep-ph
paper · pdf · doi:10.1088/1475-7516/2016/06/022
15 pages, 4 figures. Minor changes to match the published version
openalex publication_date 2016/06/09 · arxiv created 2016/06/16 · arxiv updated 2016/06/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We consider portal models which are ultraweakly coupled with the Standard Model, and confront them with observational constraints on dark matter abundance and isocurvature perturbations. We assume the hidden sector to contain a real singlet scalar s and a sterile neutrino ψ coupled to s via a pseudoscalar Yukawa term. During inflation, a primordial condensate consisting of the singlet scalar s is generated, and its contribution to the isocurvature perturbations is imprinted onto the dark matter abundance. We compute the total dark matter abundance including the contributions from condensate decay and nonthermal production from the Standard Model sector. We then use the Planck limit on isocurvature perturbations to derive a novel constraint connecting dark matter mass and the singlet self coupling with the scale of inflation: m DM /GeV ≲ 0.2λ s 3/8 ( H * /10 11 GeV) −3/2 . This constraint is relevant in most portal models ultraweakly coupled with the Standard Model and containing light singlet scalar fields.