REMINDER High Energy Physics Seminar TOMORROW (Srijit Bhattacharjee)

[HECAP - Margherita Di Giovannantonio]

*_HIGH ENERGY PHYSICS SEMINARS_*
*_
_*
*Thursday, 17*th *April* 2025, at *16:00* - *Luigi Stasi Seminar Room 
**- https://indico.ictp.it/event/10960/*
**

*
*

*/!!! in person only !!!/*

*/
/*

Srijit Bhattacharjee (IIIT Allahabad)


*“Asymptotic Symmetries and Memories at Spacetime Boundaries**"*
*
*
_Abstract_
The asymptotic structure of flat spacetimes is rich due to the presence 
of an infinite dimensional BMS group at the null boundaries. The BMS 
group encompasses the Lorentz symmetries and infinitely many additional 
symmetries like supertranslations. Supertranslations play a key role in 
understanding the relation between soft gravitational scatterings, and 
memory effects. There have been suggestions that supertranslations like 
symmetries should also be present near the horizon of a stationary black 
hole. In this talk, I will discuss some recent developments of the 
BMS-supertranslations at spacelike and timelike boundaries of flat 
spacetimes in terms of first-order variables. I will also discuss the 
emergence of supertranslation-like symmetries near the horizon of a 
black hole and their memories.