Dark Freeze-out Cogenesis
  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.
