Dark freeze-out cogenesis

Xiaoyong Chu (Institute of High Energy Physics, Austrian Academy of Sciences, Nikolsdorfergasse 18, Vienna, 1050, Austria) ; Yanou Cui (Department of Physics and Astronomy, University of California, Riverside, CA, 92521, USA) ; Josef Pradler (Institute of High Energy Physics, Austrian Academy of Sciences, Nikolsdorfergasse 18, Vienna, 1050, Austria) ; Michael Shamma (TRIUMF, 4004 Wesbrook Mall, Vancouver, BC, V6T 2A3, Canada)

We propose a new mechanism where a multi-component dark sector generates the observed dark matter abundance and baryon asymmetry and thus addresses the coincidence between the two. The thermal freeze-out of dark matter annihilating into meta-stable dark partners sets the dark matter relic abundance while providing the out-of-equilibrium condition for baryogenesis. The meta-stable state triggers baryon asymmetry production by its decay well after the freeze-out and potentially induces a period of early matter domination before its decay. The dark matter and baryon abundances are related through number conservation within the dark sector (cogenesis). The “coincidence” is a natural outcome with GeV- to TeV-scale symmetric dark matter and the dark sector’s interactions with the Standard Model quarks. We present a UV-complete model and explore its phenomenological predictions, including dark matter direct detection signals, LHC signatures of new massive particles with color charges and long-lived particles with displaced vertices, dark matter-induced nucleon conversions, (exotic) dark matter indirect detection signals, and effects on the cosmological matter power spectrum. As a side result, we provide a novel analytical treatment for dark sector freeze-out, which may prove useful in the study of related scenarios.

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      "source": "Springer", 
      "value": "We propose a new mechanism where a multi-component dark sector generates the observed dark matter abundance and baryon asymmetry and thus addresses the coincidence between the two. The thermal freeze-out of dark matter annihilating into meta-stable dark partners sets the dark matter relic abundance while providing the out-of-equilibrium condition for baryogenesis. The meta-stable state triggers baryon asymmetry production by its decay well after the freeze-out and potentially induces a period of early matter domination before its decay. The dark matter and baryon abundances are related through number conservation within the dark sector (cogenesis). The \u201ccoincidence\u201d is a natural outcome with GeV- to TeV-scale symmetric dark matter and the dark sector\u2019s interactions with the Standard Model quarks. We present a UV-complete model and explore its phenomenological predictions, including dark matter direct detection signals, LHC signatures of new massive particles with color charges and long-lived particles with displaced vertices, dark matter-induced nucleon conversions, (exotic) dark matter indirect detection signals, and effects on the cosmological matter power spectrum. As a side result, we provide a novel analytical treatment for dark sector freeze-out, which may prove useful in the study of related scenarios."
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Published on:
07 March 2022
Publisher:
Springer
Published in:
Journal of High Energy Physics , Volume 2022 (2022)
Issue 3
Pages 1-33
DOI:
https://doi.org/10.1007/JHEP03(2022)031
arXiv:
2112.10784
Copyrights:
The Author(s)
Licence:
CC-BY-4.0

Fulltext files: