Séminaire Amplitudes et Gravitation sur l'Yvette (IHES/IPhT)
I will present work in progress on asymptotic detector operators and their measurements in perturbative quantum gravity in asymptotically-flat spacetimes. The simplest example is the energy detector, which in gravity detects outgoing graviton radiation and records its energy. I will review more general detector operators in QFT, defined as light-ray operators, and construct their analogs in gravitational theories. Then I will review how to compute event shapes — correlation functions of detector operators in suitable states — in perturbation theory, repackaged in a modern language. Utilizing this, I will present the first computation of an energy-energy correlator (EEC) in perturbative quantum gravity, to leading nontrivial order in the gravitational coupling. One can think of such observables as capturing a universal part of quantum correlations between idealized LIGO detectors — as unlikely as it may be to be measured in the real world. As a bonus, I will present some results on the two-point correlators of detectors measuring powers of energy and mention work towards the three-point energy correlator (EEEC) in gravity. Along the way, I will comment on the "space of asymptotic detector operators" in a gravitational theory.
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Julio Parra-Martinez & Alessandro Podo
