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Accueil > Séminaires > Archive des séminaires d’Utinam > 2018

Benoit Famaey

Dark matter-baryons interactions as a possible explanation for the emergence of galactic scaling relations

lundi 3 décembre 2018, 15h

salle de conférences de l’observatoire

Benoit FAMAEY

Observatoire astronomique de Strasbourg

Mots-clés :
Astrophysique, matière noire

Résumé :

In this talk, I will review the observational evidence for an intimate connection between the baryonic surface density and the total gravitational field in galaxies. This observational fact presents a fine-tuning problem for the particle dark matter interpretation of mass discrepancies in galaxies. I particular, it leads to a too high "diversity" of rotation curve shapes for a given mass. On the other hand, this phenomenology is naturally explained in a paradigm hypothesizing an effective breakdown of Newtonian dynamics in the extremely low acceleration regime (MOND). However, MOND predictions break down on scales larger than galaxies. Theories modifying the lagrangian of the dark matter sector to account for the observed phenomenology in galaxies while preserving the predictions of the standard cosmological model on the largest scales are perhaps a promising way to reconcile these conflicting observational facts. I will present some tentative dark matter models which seem to fit the bill, as well as their current shortcomings.