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The State Equation of the Yang-Mills field Dark Energy Models
In this paper, we study the possibility of building Yang-Mills(YM) field dark
energy models with equation of state (EoS) crossing -1, and find that it can
not be realized by the single YM field models, no matter what kind of
lagrangian or initial condition. But the states of and
all can be naturally got in this kind of models. The former is like
a quintessence field, and the latter is like a phantom field. This makes that
one can build a model with two YM fields, in which one with the initial state
of , and the other with . We give an example model of
this kind, and find that its EoS is larger than -1 in the past and less than -1
at the present time. We also find that this change must be from to
, and it will go to the critical state of with the expansion
of the Universe, which character is same with the single YM field models, and
the Big Rip is naturally avoided.Comment: 20 pages, 4 figures. minor typos correcte