Across Planck 2015 CMB, JLA supernovae, H0 and deuterium abundance data, the dark sector interaction parameter alpha is consistent with zero at 1 sigma, and freeing Neff shifts the posterior mean toward negative alpha.
Large Magellanic Cloud Cepheid Standards Provide a 1% Foundation for the Determination of the Hubble Constant and Stronger Evidence for Physics Beyond LambdaCDM,
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Looking for interactions in the cosmological dark sector
Across Planck 2015 CMB, JLA supernovae, H0 and deuterium abundance data, the dark sector interaction parameter alpha is consistent with zero at 1 sigma, and freeing Neff shifts the posterior mean toward negative alpha.