Planck 2018 results
Free Access

This article has an erratum: [https://doi.org/10.1051/0004-6361/201833910e]


Fig. 40.

image

Constraints on the helium abundance from Planck, assuming the standard value of Neff = 3.046. Results are consistent with the predictions of standard BBN (green line), and also the observed helium abundance (68% and 95% grey bands from Aver et al. 2015).

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.