PIRSA:17110048

Baryon-dark matter interactions and the radial acceleration relation

Penco, R. (2017). Baryon-dark matter interactions and the radial acceleration relation. Perimeter Institute. https://pirsa.org/17110048

Penco, Riccardo. Baryon-dark matter interactions and the radial acceleration relation. Perimeter Institute, Nov. 07, 2017, https://pirsa.org/17110048 

          @misc{ pirsa_PIRSA:17110048,
            doi = {10.48660/17110048},
            url = {https://pirsa.org/17110048},
            author = {Penco, Riccardo},
            keywords = {Particle Physics},
            language = {en},
            title = {Baryon-dark matter interactions and the radial acceleration relation},
            publisher = {Perimeter Institute},
            year = {2017},
            month = {nov},
            note = {PIRSA:17110048 see, \url{https://pirsa.org}}
          }

Riccardo Penco

University of Pennsylvania

Talk number
PIRSA:17110048
Collection
Talk Type
Subject
Abstract

The radial acceleration relation is an empirical universal scaling relation between the total gravitational field and the Newtonian acceleration generated by baryons at any given radius within spiral galaxies. In this talk, I will discuss the possibility that such a relation arises from interactions between baryons and dark matter (DM), rather than from feedback processes or modifications of gravity. Starting from this premise, I will discuss what we can infer about the nature of baryon-DM interactions. In particular, I will argue that  such interactions must depend on the local DM density in order to correctly reproduce the observed behavior of spiral and elliptical galaxies. I will briefly revisit existing phenomenological, astrophysical and cosmological constraints on baryon-DM interactions in light of the unusual density dependence of our cross-section. I will conclude by mentioning possible ways of realizing this scenario in particle physics models, and discuss a non-relativistic toy model.