Density pertubation of unparticle dark matter in the flat Universe

Abstract

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 $f=(1+3ω_u)Ω^γ_u$, where $ω_u$ is the equation of state of unparticle. Our results show that the presence of $ω_u$ 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 $f=(1+3ω_u)Ω^γ_u+αΩ_m$ and $α$ is a function of $ω_u$. 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.

6pages, 4 figures, accepted for publication in Eur. Phys. J. C