Evolution of magnetic component in Yang-Mills condensate dark energy
  models
  The evolution of the electric and magnetic components in an effective
Yang-Mills condensate dark energy model is investigated. If the electric field
is dominant, the magnetic component disappears with the expansion of the
Universe. The total YM condensate tracks the radiation in the earlier Universe,
and later it becomes $w_y\sim-1$ thus is similar to the cosmological constant.
So the cosmic coincidence problem can be avoided in this model. However, if the
magnetic field is dominant, $w_y>1/3$ holds for all time, suggesting that it
cannot be a candidate for the dark energy in this case.
