Abstract:
In this talk, I will review recent works done in collaboration with L. Ciambelli and R. Leigh, focusing on the non-perturbative characterization of the gravitational phase space along null boundaries. I will present the construction of the Carrollian curved geometry, the Poisson bracket and discuss the construction of  a field-dependent time called dressing time that allows the construction of a positive definite boost generator for expanding null surfaces.
If time permits, I will discuss some elements of the quantization and the appearance of a crucial Quantum central charge and the resolution of the problem of time. I will also discuss how these results connect to the celestial holography program when one treats the null boundary as an asymptotically null one.
I will only sketch why these results are important to address the upcoming interferometry experiments that are now being under construction to measure the light ray  vacuum fluctuations.



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Meeting ID: 964 6040 4622
 
Passcode: 204513