Cosmic concordance, cosmic discordance, and the dark sector of particle physics

Martedì 4 febbraio 2020 alle ore 15:00, presso Via della Vasca Navale 84 - Aula C, Julien Lesgourgues ( TTK - RWTH Aachen University), terrà il Colloquio di Fisica dal titolo "Cosmic concordance, cosmic discordance, and the dark sector of particle physics".

Abstract
Data from the Planck satellite and other cosmological probes offer an overall consistent picture of the standard cosmological model. This concordance is however threatened by growing evidence for a few anomalies: the long-standing “small scale crisis” and "sigma8 anomaly", a more controversial "Hubble tension'', and an even more controversial "Edges anomaly''. A very interesting case for theorists is that if these tensions are not due to poorly understood systematics or astrophysical effects, they could be explained by new particle physics ingredients, such as new interactions in the dark sector, that would involve at least two types of dark relic particles.

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