Density pertubation of unparticle dark matter in the flat Universe

TL;DR

This paper explores how unparticle dark matter influences the growth of density perturbations in a flat universe, providing new models for the growth factor that differ from traditional dark matter predictions.

Contribution

It introduces novel approximations for the growth factor of unparticle dark matter, considering both sole presence and coexistence with cold dark matter.

Findings

Growth factor approximated as f=(1+3ω_u)Ω_u^γ for unparticle-only models.

Modified growth factor with an additional term when unparticle coexists with cold dark matter.

Unparticle dark matter significantly alters the growth of cosmic structures.

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 $f=(1+3\omega_u)\Omega^{\gamma}_u$, where $\omega_u$ is the equation of state of unparticle. Our results show that the presence of $\omega_u$ 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 $f=(1+3\omega_u)\Omega^{\gamma}_u+\alpha \Omega_m$ and $\alpha $ is a function of $\omega_u$. 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.