publication . Article . Other literature type . Preprint . 2018

Composite asymmetric dark matter with a dark photon portal

Masahiro Ibe; Wakutaka Nakano; Ayuki Kamada; Shin Kobayashi;
Open Access English
  • Published: 30 Nov 2018
  • Publisher: Springer
Abstract
Asymmetric dark matter (ADM) is an attractive framework relating the observed baryon asymmetry of the Universe to the dark matter density. A composite particle in a new strong dynamics is a promising candidate for ADM as the strong dynamics naturally explains the ADM mass in the GeV range. Its large annihilation cross section due to the strong dynamics leaves the asymmetric component to be dominant over the symmetric component. In such composite ADM scenarios, the dark sector has a relatively large entropy density in the early Universe. The large dark sector entropy results in the overclosure of the Universe or at best contradicts with the observations of the co...
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doi: 10.1007/jhep11(2018)203
Subjects
arXiv: Astrophysics::Cosmology and Extragalactic Astrophysics
free text keywords: Beyond Standard Model, Cosmology of Theories beyond the SM, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798, Nuclear and High Energy Physics, High Energy Physics - Phenomenology, Universe, media_common.quotation_subject, media_common, Particle physics, Dark photon, Dark matter, Baryon asymmetry, Leptogenesis, Standard Model, Annihilation, Physics, Cosmic microwave background
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