Dynamics of Dark Matter
Dynamics of Dark Matter
- Event time: 1:00pm until 2:00pm
- Event date: 21st April 2023
- Speaker: Martin Weinberg (University of Massachusetts Amherst)
- Location: Higgs Centre Seminar Room, Room 4305, James Clerk Maxwell Building (JCMB) (James Clerk Maxwell Building (JCMB)) James Clerk Maxwell Building Peter Guthrie Tait Road Edinburgh EH9 3FD GB
Event details
'Dark matter' (DM) is a dynamical hypothesis born from our inability to comprehend kinematic observations at the galaxy scale and larger using baryonic matter only. Astronomers have struggled with the implications of DM for galaxy formation and evolution for decades. Conversely, we've exploited observations and cosmological simulations to constrain the DM hypothesis. The many failures in our standard cosmongony have led to a long list of 'crises' in the paradigm and motivated some to abandon Newtonian gravity. This talk will address the question: why are we still at this 45 years later? I will attempt to convince you from first principles and examples that the answer is rooted in the complex nature of dynamics itself. Galaxies are the limit of many-body systems with an infinite degrees of freedom. I will set the stage with a review of dynamics in this infinite limit and motivate how and why correct simulations of DM dynamics is hard. I will then move on to real-world examples of interactions, the mystery of barred galaxies, and a sobering surprise from the details of halo dynamics itself. I will end by proposing a framework for making more progress.
Martin will be at the Higgs Centre in person.
Event resources
About Higgs Centre colloquia
The Higgs Centre Colloquia are a fortnightly series of talks aimed at a wide-range of topical Theoretical Physics issues..