2010/12/31 by Jian-Hua He, Bin Wang, Elcio Abdalla · 2 citations
Physics and Astronomy · #astro-ph.CO #gr-qc #hep-th
paper · pdf · doi:10.1103/physrevd.83.063515
published as Phys.Rev.D83:063515,2011 · 13 pages, 5 figures, revised version, accepted for publication in Phys. Rev. D
arxiv created 2011/02/16 · arxiv updated 2011/03/22
Cosmological analysis based on currently available observations are unable to rule out a sizeable coupling between dark energy and dark matter. However, the signature of the coupling is not easy to grasp, since the coupling is degenerate with other cosmological parameters, such as the dark energy equation of state and the dark matter abundance. We discuss the possible ways to break such degeneracy. Based on the perturbation formalism, we carry out the global fitting by using latest observational data and get a tight constraint on the interaction between dark sectors. We find that the appropriate interaction can alleviate the coincidence problem.