Speaker
Juan José León Gil
(Universidad de Antioquia)
Description
It is presented an overview of the effective number of relativistic degrees of freedom $N_{eff}$, a parameter related to observations such as the abundance of light nuclei produced during Big-Bang Nucleosynthesis and temperature anisotropies in the Cosmic Microwave Background. Deviations $\Delta N_{eff}$ from the Standard Model prediction $N_{eff} = 3.045$ constitute clear signs of new physics, some of which will be commented.
Author
Juan José León Gil
(Universidad de Antioquia)
