PIRSA:24090185

From ’t Hooft to BMS: Connecting Shockwaves and Memories

He, T. (2024). From ’t Hooft to BMS: Connecting Shockwaves and Memories. Perimeter Institute. https://pirsa.org/24090185

He, Temple. From ’t Hooft to BMS: Connecting Shockwaves and Memories. Perimeter Institute, Sep. 26, 2024, https://pirsa.org/24090185 

          @misc{ pirsa_PIRSA:24090185,
            doi = {10.48660/24090185},
            url = {https://pirsa.org/24090185},
            author = {He, Temple},
            keywords = {},
            language = {en},
            title = {From {\textquoteright}t Hooft to BMS: Connecting Shockwaves and Memories},
            publisher = {Perimeter Institute},
            year = {2024},
            month = {sep},
            note = {PIRSA:24090185 see, \url{https://pirsa.org}}
          }

Temple He

California Institute of Technology (Caltech)

Talk number
PIRSA:24090185
Collection
Talk Type
Abstract

We study the infrared on-shell action of Einstein gravity in asymptotically flat spacetimes, obtaining an effective, gauge-invariant boundary action for memory and shockwave spacetimes. We show that the phase space is in both cases parameterized by the leading soft variables in asymptotically flat spacetimes, thereby obtaining an equivalence between shockwave and soft commutators. We then demonstrate that our on-shell action is equal to three quantities studied separately in the literature: (i) the soft supertranslation charge; (ii) the shockwave effective action; and (iii) the soft effective action.