  Color superconductors in which quarks of the same flavor form Cooper pairs
are investigated. These Cooper pairs carry total spin one. A systematic
group-theoretical classification of possible phases in a spin-one color
superconductor is presented, revealing parallels and differences to the theory
of superfluid $^3$He. General expressions for the gap parameter, the critical
temperature, and the pressure are derived and evaluated for several spin-one
phases, with special emphasis on the angular structure of the gap equation. It
is shown that the (transverse) color-spin-locked phase is expected to be the
ground state.
