Την Τετάρτη 15 Οκτωβρίου στις 12:00 μ.μ. ο Adrien Fiorucci (Ecole Polytechnique) θα δώσει ένα διαδικτυακό σεμινάριο.

Η ομιλία θα αναμεταδοθεί μέσω Zoom στον ακόλουθο σύνδεσμο:
https://authgr.zoom.us/j/92124025457?pwd=R8ThYVNRDI5YQXwRbKX47uQPt33Lxt.1

Meeting ID: 921 2402 5457
Passcode: 115067

Ακολουθούν ο τίτλος και η περίληψη της ομιλίας.

Τίτλος: Holographic Derivation of BMS Flux-Balance Laws

Περίληψη: The main challenges in formulating a holographic correspondence for asymp- totically flat spacetimes stem from the null nature of the conformal boundary and the non-conservation of gravitational charges in the presence of bulk ra- diation. In this talk, I will present the systematic and mathematically robust approach to understanding and deriving the associated flux-balance laws from geometric principles defined intrinsically at the boundary.

I will begin by reviewing key aspects of the geometry at null infinity, known as conformal Carroll geometry. I will highlight that the boundary affine con- nections contain degrees of freedom that naturally act as sources encoding radiation in a holographic framework. I will then derive flux-balance laws for an effective field theory formulated at the boundary, using novel tech- niques that introduce “hypermomenta” as the responses to fluctuations in the boundary connection. These equations reproduce the celebrated BMS flux-balance laws in a convenient boundary gauge.