2017/04/30 by Felix Kahlhoefer, Kai Schmidt-Hoberg, Sebastian Wild · 1 citation
Computer Science · Physics and Astronomy · #Axion #Computational Physics and Python Applications #Cosmic microwave background #Cosmological perturbation theory #Dark Matter and Cosmic Phenomena #Dark fluid #Dark matter #Observable #Particle physics theoretical and experimental studies #Realization (probability) #Scalar (mathematics) #Scalar field dark matter #astro-ph.CO #hep-ph
paper · pdf · doi:10.1088/1475-7516/2017/08/003
published as JCAP08(2017)003 · 20 pages, 5 figures + appendices. v2: Matches published version. v3: fixed typographical mistake in eq. (2.8). v4: fixed typographical mistake in eq. (C.4)
openalex created_date 2017/04/28 · openalex publication_date 2017/08/03 · arxiv created 2017/12/22 · arxiv updated 2017/12/25 · openalex updated_date 2026/08/06
Dark matter particles interacting via the exchange of very light spin-0 mediators can have large self-interaction rates and obtain their relic abundance from thermal freeze-out. At the same time, these models face strong bounds from direct and indirect probes of dark matter as well as a number of constraints on the properties of the mediator. We investigate whether these constraints can be consistent with having observable effects from dark matter self-interactions in astrophysical systems. For the case of a mediator with purely scalar couplings we point out the highly relevant impact of low-threshold direct detection experiments like CRESST-II, which essentially rule out the simplest realization of this model. These constraints can be significantly relaxed if the mediator has CP-violating couplings, but then the model faces strong constraints from CMB measurements, which can only be avoided in special regions of parameter space.