Can Interaction Between Dark Energy and Dark Matter Be Detected in the Kinetic Sunyaev-Zel’dovich Spectrum?

• Main Authors: Xiao-dong Xu, Bin Wang
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: South Pole; South pole
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.653.467; http://cospa.ntu.edu.tw/V1N2/V1N2_3.pdf

We analyze the effect of the interaction on the evolution of the gravitational field and the matter peculiar velocity field. We find that for different model parameters the matter peculiar velocity could be factor 2 times larger or 5 times smaller than the amplitude of velocity perturbations in the concordance ΛCDM cosmological model at the same scales. We examine whether the current upper limits on the amplitude of the KSZ power spectrum can provide constraints on the coupling within the dark sectors. We show that current upper limits from the Atacama Cosmology Telescope and the South Pole Telescope favor Dark Energy decaying into Dark Matter, as required to solve the coincidence problem. PACS numbers: 98.80.Es, 98.80.Bp, 98.80.Jk 1.