点击次数：

论文类型：期刊论文

发表时间：2014-08-01

发表刊物：JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS

收录刊物：SCIE、Scopus

卷号：2014

期号：8

ISSN号：1475-7516

关键字：cosmological parameters from LSS; cosmological parameters from CMBR; dark energy theory

摘要：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 (Q) over bar = 3H xi(x)(rho) over bar (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.