http://arxiv.org/abs/1702.02143
We investigate the observational constraints on an interacting vacuum energy scenario with two different neutrino schemes (with and without a sterile neutrino) using the most recent data from CMB temperature and polarization anisotropy, baryon acoustic oscillations (BAO), type Ia supernovae from JLA sample, structure growth inferred from cluster counts, and Hubble parameter measurements. We find that inclusion of the galaxy clusters data with the minimal data combination CMB + BAO + JLA suggests an interaction in the dark sector, implying the decay of dark matter particles into dark energy, since the constraints obtained by including the galaxy clusters data yield a non-null and negative coupling parameter between the dark components at 99\% confidence level. The model is found to alleviate the current tensions on the parameters $H_0$ and $\sigma_8$.
S. Kumar and R. Nunes
Thu, 9 Feb 17
25/67
Comments: 9 pages, 4 figures; comments are welcome