Motivated by the possibility of H0t0> 1 where H0 and t0 are the Hubble parameter and the age of the universe, respectively, we investigate the cosmology including x-matter. x-matter is expressed by the equation of state px = w0ρx0 + c2 s(ρx − ρx0),
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Chiba et al. (1997) studied this question.
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