Free Access

Fig. 14

thumbnail

Joint fits to the baryon-to-photon number ratio, η10=1010η, and the equivalent number of light neutrino species Neff, using a χ2 analysis with the code developed by Fiorentini et al. (1998) and Lisi et al. (1999). The value of the primordial 4He abundance has been set to Yp = 0.254 (Fig. 13) and that of (D/H)p is taken from Pettini & Cooke (2012). The neutron lifetime of τn = 880.1 ± 1.1s from Beringer et al. (2012) has been adopted. The filled circle corresponds to . Solid lines from the inside out correspond to confidence levels of 68.3% (), 95.4% () and 99.0% (), respectively. The SBBN value Neff = 3.046 is shown with a dashed line.

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.