Video Lectures

We construct compactifications of type IIB string theory that yield, at leading order in the α ′ α ′ and g s g s expansions, de Sitter vacua of the form envisioned by Kachru, Kallosh, Linde, and Trivedi. We specify explicit Calabi-Yau orientifolds...

Superradiant instabilities may create clouds of ultralight bosons around rotating black holes, forming so-called "gravitational atoms". In this talk, I will review a series of papers that study the effects of a binary companion’s presence. The...

In recent years, there have been various activities trying to better understand the interplay between non-invertible global symmetries and boundary conditions in quantum field theories, with applications ranging from scattering of solitons to...

I’ll discuss an old technique called intensity interferometry, pioneered by Hanbury Brown and Twiss (HBT) that allows us to achieve sub-microarcsecond angular resolution using ordinary ground-based optical telescopes observing visible light.  This...

Based on https://arxiv.org/abs/2408.11139 . In this talk we'll explain how self-dual metrics (which correspond to spacetimes containing only positive helicity gravitons) can be written as a sum over connected "tree" diagrams, which are different...

Planetary systems are shaped as much by destructive processes --- N-body instabilities, catastrophic impacts, and atmospheric loss --- as by accretionary ones. We examine the histories of violence written in: (a) the orbital architectures of super...