We point out a unique mechanism to produce the relic abundance for the glueball dark matter from a gauged SU(N)d hidden sector which is bridged to the standard model sector through heavy vectorlike quarks colored under gauge interactions from both sides. A necessary ingredient of our assumption is that the vectorlike quarks, produced either thermally or nonthermally, are abundant enough to dominate the universe for some time in the early universe. They later undergo dark color confinement and form unstable vectorlike-quarkonium states which annihilate decay and reheat the visible and dark sectors. The ratio of entropy dumped into two sectors and the final energy budget in the dark glueballs is only determined by low energy parameters, including the intrinsic scale of the dark SU(N)d, Λd, and number of dark colors, Nd, but depend weakly on parameters in the ultraviolet such as the vectorlike quark mass or the initial condition. We call this a cosmic selection rule for the glueball dark matter relic density.

Physical Review D

Soni, A. (Amarjit), Xiao, H. (Huangyu), & Zhang, Y. (2017). Cosmic selection rule for the glueball dark matter relic density. Physical Review D, 96(8). doi:10.1103/PhysRevD.96.083514