"it has been found that there is a tension between the Hubble constant (H0) due to
the Planck measurements of the CMB anisotropies and that due to the direct measurements
Due to the Planck measurements[2, 3], we have the Hubble constant
H0 = 67.3 km s−1Mpc−1. (1)
On the other hand, there are many direct measurements, and the three examples of direct measurements give us[5–7]H0 = 73.8, 74.3, and 78.7 km s−1Mpc−1. (2)
These data show that there is a large discrepancy of 9.7% ∼ 16.9%
. To solve this problem, various mechanisms have been proposed, such as models of decaying dark matter, a local void model, and the dark radiation."
Fonte Arxiv, Maggio 2017 --> https://arxiv.org/pdf/1702.07821.pdf
Insomma: potrebbe non bastare la materia oscura
, e ci potrebbe essere una materia oscura "in decadimento", oppure una "radiazione oscura".
Le creature fantastiche della cosmologia si moltiplicano