## Primordial Nucleosynthesis: from precision cosmology …

### Primordial Nucleosynthesis: from precision cosmology ..

Cosmology has entered the precision era: we now have a standard model for cosmology where the content, history and evolution of the Universe are described by few parameters. These parameters are constrained by observations at the percent level or better.

### Primordial Nucleosynthesis in the Precision Cosmology Era ..

Neutrinos influence cosmology in several ways: when the temperature of the Universe was of the order of MeV they affect primordial nucleosynthesis as the number of effective neutrinos species affect the amount of radiation and therefore the expansion rate of the Universe (the photons density is extremely well determined via the CMB temperature).

In the recent years, the improvement on the measurement accuracy of light primordial nuclei abundances allowed BBN to enter in a sort of precision era.