Accidentally Asymmetric Dark Matter

Abstract

We study the effect of a first-order phase transition in a confining $SU(N)$ dark sector with heavy dark quarks. The baryons of this sector are the dark matter candidate. During the confinement phase transition the heavy quarks are trapped inside isolated, contracting pockets of the deconfined phase, giving rise to a second stage of annihilation that dramatically suppresses the dark quark abundance. The surviving abundance is determined by the local accidental asymmetry in each pocket. The correct dark matter abundance is obtained for $\mathcal{O}(1-100)$ PeV dark quarks, above the usual unitarity bound.

5 pages, 3 figures, comments are welcomed

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• Dark atoms and composite dark matter
• Glueballs in a Thermal Squeezeout Model
• Pinning down the primordial black hole formation mechanism with gamma-rays and gravitational waves
• Cosmology of Supercooled Universe
• Gravitational Waves from dark composite dynamics
• Perturbative Unitarity of Strongly Interacting Massive Particle Models