Time delay as a probe of geometric fluctuations

Can high-energy quantum fluctuations leave an imprint at low energies?

This question is central to understanding how ultraviolet physics enters infrared gravitational observables, and whether microscopic quantum fluctuations can generate macroscopic signatures analogous to the way Brownian motion reveals underlying molecular dynamics. In this talk, I will discuss these questions based on the analysis of the time delay fluctuations of null rays in the context of interferometric observables. I will present the gauge-invariant formulation of the observable, and show what it predicts for graviton fluctuations in different states, as well as for backreaction of quantum stress-tensor correlations.

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Speaker: Robin Oberfrank (Perimeter Institute for Theoretical Physics)

Time: 14:00

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Time delay as a probe of geometric fluctuations

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