Photons emitted by extragalactic sources provide an opportunity to test quantum gravity effects that modify the speed of light in vacuum. Studying the arrival times of these cosmic messengers further constrains the energy scales involved.
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Jacholkowska, A. Spacetime fuzziness in focus. Nature Phys 11, 302–303 (2015). https://doi.org/10.1038/nphys3293
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DOI: https://doi.org/10.1038/nphys3293
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