Testing coupled dark energy with large scale structure observation

Abstract

The coupling between the dark components provides a new approach to mitigate the coincidence problem of cosmological standard model. In this paper, dark energy is treated as a fluid with a constant equation of state, whose coupling with dark matter is $\bar{Q}=3H{\xi }_x{\bar{\rho }}_x$. In the frame of dark energy, we derive the evolution equations for the density and velocity perturbations. According to the Markov Chain Monte Carlo method, we constrain the model by currently available cosmic observations which include cosmic microwave background radiation, baryon acoustic oscillation, type Ia supernovae, and $f{\sigma }_8(z)$ data points from redshift-space distortion. The results show the interaction rate in 3$\sigma$ regions: ${\xi }_x=0.00328_{-0.00328-0.00328-0.00328}^{+0.000736+0.00549+0.00816}$, which means that the recently cosmic observations favor a small interaction rate which is up to the order of $10^{-2}$, meanwhile, the measurement of redshift-space distortion could rule out the large interaction rate in the 1$\sigma$ region.

12 pages, 10 figures. arXiv admin note: text overlap with arXiv:1401.1286

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