BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Cyril Pitrou (Institut d'Astrophysique de Paris) DTSTART:20210308T150000Z DTEND:20210308T160000Z DTSTAMP:20260423T003256Z UID:IFTWeb/37 DESCRIPTION:Title: Precision big bang nucleosynthesis and the status of deuterium\nby Cyr il Pitrou (Institut d'Astrophysique de Paris) as part of IFT-Madrid Webina rs\n\n\nAbstract\nPrimordial nucleosynthesis or Big-Bang Nucleosynthesis ( BBN) happens during the first 300 seconds of our Universe. It is one of th e three evidences for the big-bang model\, together with the cosmological expansion and the Cosmic Microwave Background (CMB). Now that the number o f neutrino families and the baryonic densities have been fixed by laborato ry measurements or CMB observations\, it has become a parameter free model . Since the most recent measurements of primordial deuterium and Helium-4 abundances reach the percent level in precision\, it is necessary to obtai n a similar precision in theoretical predictions. I will review the basic physics of primordial cosmology and BBN and then review the various effect s which need to be taken into account at that epoch in order to obtain suc h precision. I will also discuss a tension in primordial deuterium which h as emerged following a recent update on one of the key nuclear rates.\n LOCATION:https://researchseminars.org/talk/IFTWeb/37/ END:VEVENT END:VCALENDAR