A cosmological model is introduced in which dark matter plays a dominant role throughout the history of the universe, and is the only matter present for temperatures $T \gtrsim T_{ 15} \sim 10^9$ GeV. The gauge group is $SU(3) \times SU(6)_{ DM} \times U(1)_Y$ and unifies in such a way that luminous matter is generated at $T \sim T_{ 15}$ with the correct amount and eventual asymmetry. Construction of more highly sensitive direct detectors of dark matter (e.g. XENON1T) is encouraged. We offer a new explanation of why grand unification theories involving only luminous matter may be fatally flawed.
Categories: hep-ph astro-ph.CO