NOTE: With the increase in infections and the updated guidance from Stanford, please remember that if you attend the in-person colloquium, masks should be worn (except for the speaker). 

For recordings of past colloquia, click on the colloquium title on the AP/Physics colloquium page for recent colloquia or on the archive page for earlier colloquia.

Stanford University 

APPLIED PHYSICS/PHYSICS COLLOQUIUM 

Tuesday, May 31, 2022 3:30 p.m. on campus in Hewlett Teaching Center, Rm. 200 

Refreshments served in Varian lobby at 4:45 p.m. 

Face coverings required in classrooms 

Zoom link: https://stanford.zoom.us/j/99293784762

Password: email skannan2@stanford.edu for password.

Tracy Slatyer 

Massachusetts Institute of Technology 

“Bound States in Heavy Dark Sectors: from WIMPonium to Squeezeout” 

The nature of dark matter remains one of the great puzzles of fundamental physics, with potential connections to a plethora of deep questions. While dark matter is often assumed to be collision-less, dark matter particles may interact with each other through either the known forces of the Standard Model of particle physics, or new "dark" forces, while remaining consistent with current constraints. In either case, dark matter may form bound states similar to those we observe in ordinary matter. I will discuss a range of possible implications of the existence of such bound states, including observational signatures in gamma-ray telescopes, and modifications to the history of the cosmos allowing for strikingly heavy dark matter in strongly interacting dark sectors.