PIRSA:25040083

Video URL

https://pirsa.org/25040083

The extremal black hole threshold

Unger, R. (2025). The extremal black hole threshold. Perimeter Institute for Theoretical Physics. https://pirsa.org/25040083

Unger, Ryan. The extremal black hole threshold. Perimeter Institute for Theoretical Physics, Apr. 03, 2025, https://pirsa.org/25040083 

          @misc{ scivideos_PIRSA:25040083,
            doi = {10.48660/25040083},
            url = {https://pirsa.org/25040083},
            author = {Unger, Ryan},
            keywords = {Strong Gravity},
            language = {en},
            title = {The extremal black hole threshold},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2025},
            month = {apr},
            note = {PIRSA:25040083 see, \url{https://scivideos.org/pirsa/25040083}}
          }

Ryan Unger Stanford University

Talk numberPIRSA:25040083
DOI10.48660/25040083
Source RepositoryPIRSA
Collection
Talk Type Scientific Series
Subject

Abstract

In this talk, I will present a proof that extremal Reissner-Nordström arises on the black hole formation threshold for the Einstein equations coupled to a self-gravitating plasma. This constitutes the first rigorous result on critical collapse. I will then discuss a formulation of the stability problem for extremal black holes, and present a positive resolution in the case of extremal Reissner-Nordström perturbed by a self-gravitating neutral scalar field in spherical symmetry, despite the presence of the celebrated Aretakis instability. This is based on joint work with Yannis Angelopoulos (Caltech) and Christoph Kehle (MIT) (2402.10190, 2410.16234).