Gravity's weight on worldline fuzziness

Abstract

We investigate a connection between recent results in 3D quantum gravity, providing an effective noncommutative-spacetime description, and some earlier heuristic descriptions of a quantum-gravity contribution to the fuzziness of the worldlines of particles. We show that 3D-gravity-inspired spacetime noncommutativity reflects some of the features suggested by previous heuristic arguments. Most notably, gravity-induced worldline fuzziness, while irrelevantly small on terrestrial scales, could be observably large for propagation of particles over cosmological distances.

arXiv comment8 pages. This essay received an honorable mention in the 2012 Essay Competition of the Gravity Research Foundation

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Cited by in corpus (1)

• Spacetime geometry fluctuations and geodesic deviation