Du 3 avril 2020 au 26 juin 2020

Every Friday morning at 10:30 CET 03/4 Nicolas Martin (ObAS) 17/4 Pau Ramos (Barcelona) 24/4...

Accueil   >   Recherche   >   Séminaires et réunions   >   Séminaires : Gravitational probes of dark matter

Gravitational probes of dark matter

Le 27 septembre 2019
De 10h30 à 12h00

Justin Read

University of Surrey


Dark matter makes up most of the mass of the Universe but remains mysterious. I discuss recent progress in constraining its properties by measuring its distribution in the Universe from tiny dwarf galaxies to giant galaxy clusters. I show that the latest results favour a cold, collisionless particle that lies beyond the standard model of particle physics. However, for a long time this model has been in tension with the abundance and internal dark matter distribution of nearby dwarf galaxies, tensions that have become known as the "cusp-core", "missing satellites" and "too big to fail" problems. I present the first observational evidence that the cusp-core problem owes to baryonic feedback "heating up" dark matter during galaxy formation, and I show that this naturally solves both the missing satellites and "too big to fail" problems too. This provides further evidence that dark matter is, to a good approximation, a cold, collisionless fluid that can be heated up and moved around. I conclude with a discussion of the latest constraints on self-interacting and warm dark matter models.

Search & Find
mai 13 2020

The ObAS seminars have moved online, every Friday morning at 10:30 here The program of the coming...

mai 19 2020

Oliver Müller, post-doctorant à l'Observatoire astronomique de Strasbourg, a reçu pour ses travaux...

mars 5 2020

    L’observatoire astronomique de Strasbourg accueille 83 personnes, dont 56 fonctionnaires...

févr. 7 2020

Des chercheurs de Bonn et de Strasbourg ont simulé la formation de galaxies dans un Univers sans...

janv. 9 2020

Omkar Bait, astronome au NCRA (Pune, Inde) et ses collaborateurs (dont Pierre-Alain Duc,...