Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2009-06-03
Phys.Rev.D80:063530,2009
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
17 pages, 9 figures, revised version, more discussions added, accepted for publication in PRD
Scientific paper
10.1103/PhysRevD.80.063530
Dark energy interacting with dark matter is a promising model to solve the cosmic coincidence problem. We study the signature of such interaction on large scale cosmic microwave background (CMB) temperature anisotropies. Based on the detail analysis in perturbation equations of dark energy and dark matter when they are in interaction, we find that the large scale CMB, especially the late Integrated Sachs Wolfe effect, is a useful tool to measure the coupling between dark sectors. We also discuss the possibility to detect the coupling by cross-correlating CMB maps with tracers of the large scale structure. We finally perform the global fitting to constrain the coupling by using the CMB power spectrum data together with other observational data. We find that in the $1\sigma$ range, the constrained coupling between dark sectors can solve the coincidence problem.
He Jian-Hua
Wang Bin
Zhang Pengjie
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