Density pertubation of unparticle dark matter in the flat Universe

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The unparticle has been suggested as a candidate of dark matter. We investigated the growth rate of the density perturbation for the unparticle dark matter in the flat Universe. First, we consider the model in which unparticle is the sole dark matter and find that the growth factor can be approximated well by f=(1+3ωᵤ)Ωγᵤ, where ωᵤ is the equation of state of unparticle. Our results show that the presence of ωᵤ modifies the behavior of the growth factor f. For the second model where unparticle co-exists with cold dark matter, the growth factor has a new approximation f=(1+3ωᵤ)Ωγᵤ+αΩₘ and α is a function of ωᵤ. Thus the growth factor of unparticle is quite different from that of usual dark matter. These information can help us know more about unparticle and the early evolution of the Universe.