Dark matter relic density in strongly interacting dark sectors with light vector mesons

2023/11/28 by Bernreuther, Elias, Hemme, Nicoline, Kahlhoefer, Felix +1 · 4 citations
#Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.2311.17157

Abstract

Stable dark matter particles may arise as pseudo-Goldstone bosons from the confinement of dark quarks interacting via a non-Abelian gauge force. Their relic abundance is determined not by annihilations into visible particles but by dark pion number-changing processes within the dark sector, such as 3 π_D → 2 π_D. However, if the dark vector mesons ρ_D are light enough for 3 π_D → π_D ρ_D annihilations to be kinematically allowed, this process dominates and significantly delays freeze-out. As a result, the preferred dark matter mass scale increases and bounds from the Bullet Cluster can be evaded.

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