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SUMMARY:Precision big bang nucleosynthesis with improved Helium-4 predicti
 ons - Cyril Pitrou(IAP)
DTSTART:20191021T120000Z
DTEND:20191021T130000Z
UID:TALK131533@talks.cam.ac.uk
CONTACT:Sadra Jazayeri
DESCRIPTION:Abstract : Primordial nucleosynthesis or Big-Bang Nucleosynthe
 sis (BBN) happens during the first 300 seconds of our Universe. It is one 
 of the three evidences for the big-bang model\, together with the cosmolog
 ical expansion and the Cosmic Microwave Background (CMB). Now that the num
 ber of neutrino families and the baryonic densities have been fixed by lab
 oratory measurements or CMB observations\, it has become a parameter free 
 model. Hence\, it is widely used to exclude or constrain extension of the 
 standard cosmological model. Since the most recent measurements of primord
 ial deuterium and Helium-4 abundances reach the percent level in precision
 \, it is necessary to obtain a similar precision in theoretical prediction
 s. I will first review the basic physics of primordial cosmology and BBN a
 nd then review the various effects which need to be taken into account at 
 that epoch in order to obtain such precision.
LOCATION:CMS\, Pav. B\, CTC Common Room (B1.19) [Potter Room]
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