The APDE seminar on Monday, 09/21, will be given by Jonathan Luk online via Zoom from 4:10 to 5pm. To participate, email Georgios Moschidis () or Federico Pasqualotto ().

Title: High-frequency limits, null dust shells, and the formation of trapped surfaces in general relativity.

Abstract: I will discuss the three problems in the title and some (surprising?) connections between them. This is a joint work with Igor Rodnianski.