PIRSA:24030103

Video URL

https://pirsa.org/24030103

Free-falling in Quantum Spacetime

Parikh, M. (2024). Free-falling in Quantum Spacetime. Perimeter Institute for Theoretical Physics. https://pirsa.org/24030103

Parikh, Maulik. Free-falling in Quantum Spacetime. Perimeter Institute for Theoretical Physics, Mar. 07, 2024, https://pirsa.org/24030103 

          @misc{ scivideos_PIRSA:24030103,
            doi = {10.48660/24030103},
            url = {https://pirsa.org/24030103},
            author = {Parikh, Maulik},
            keywords = {Quantum Gravity},
            language = {en},
            title = {Free-falling in Quantum Spacetime},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2024},
            month = {mar},
            note = {PIRSA:24030103 see, \url{https://scivideos.org/pirsa/24030103}}
          }

Maulik Parikh Arizona State University

Talk numberPIRSA:24030103
DOI10.48660/24030103
Source RepositoryPIRSA
Collection
Talk Type Scientific Series
Subject

Abstract

When the spacetime metric is regarded as a quantum field, the classical trajectories of freely falling objects are subject to random fluctuations, or “noise”. This fundamental noise might even be observable at gravitational wave detectors: if detected, it would provide experimental evidence for the quantization of gravity. The effect of the quantum-gravitational noise is to turn the classical geodesic deviation equation into a stochastic, Langevin-like equation. Moreover, when these results are extended to congruences of geodesics, the quantum fluctuations of spacetime give rise to an additional term in the Raychaudhuri equation with the same sign as the other terms.

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