# Limits on Spacetime Foam

@article{Christiansen2009LimitsOS, title={Limits on Spacetime Foam}, author={Wayne Arthur Christiansen and David J. E. Floyd and Y. Jack Ng and Eric S. Perlman}, journal={Physical Review D}, year={2009}, volume={83}, pages={084003} }

Plausibly spacetime is foamy on small distance scales, due to quantum fluctuations. We elaborate on the proposal to detect spacetime foam by looking for seeing disks in the images of distant quasars and active galactic nuclei. This is a null test in the sense that the continued presence of unresolved point sources at the milliarcsecond level in samples of distant compact sources puts severe constraints on theories of quantized spacetime foam at the Planckian level. We discuss the geometry of…

## 24 Citations

### Using Observations of Distant Quasars to Constrain Quantum Gravity

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One aspect of the quantum nature of spacetime is its “foaminess” at very small scales. Many models for spacetime foam are defined by the accumulation power α, which parameterizes the rate at which…

### DETECTABILITY OF PLANCK-SCALE-INDUCED BLURRING WITH GAMMA-RAY BURSTS

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Microscopic fluctuations inherent to the fuzziness of spacetime at the Planck scale might accumulate in wavefronts propagating a cosmological distance and lead to noticeable blurring in an image of a…

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Astronomical observations of distant quasars may be important to test models for quantum gravity, which posit Planck-scale spatial uncertainties (’spacetime foam’) that would produce phase…

### A limit on Planck-scale froth with ESPRESSO

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Some models of quantum gravity predict that the very structure of space–time is ‘frothy’ due to quantum fluctuations. Although the effect is expected to be tiny, if these space–time fluctuations…

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A challenge of modern physics is to develop a theory of Quatum Gravity. Some models elaborated with this purpose predict measurable effects on photon propagation in vacuum. In particular, the quantum…

### Holographic Quantum Foam

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Due to quantum fluctuations, probed at small scales, spacetime is very complicated -- something akin in complexity to a turbulent froth which the late John Wheeler dubbed quantum foam, aka spacetime…

### Various Facets of Spacetime Foam

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Spacetime foam manifests itself in a variety of ways. It has some attributes of a turbulent fluid. It is the source of the holographic principle. Cosmologically it may play a role in explaining why…

### UvA-DARE (Digital Academic Repository) Observational signatures of quantum gravity in interferometers

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We consider the uncertainty in the arm length of an interferometer due to metric ﬂuctuations from the quantum nature of gravity, proposing a concrete microscopic model of energy ﬂuctuations in…

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