Spacetime might seem smooth, but it could, at very short length scales, be quantized. Energetic neutrinos from gamma-ray bursts could provide a useful means to investigate further, and probe the nature of quantum gravity.
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Amelino-Camelia, G. Neutrinos and quantum spacetime. Nature Phys 3, 81–83 (2007). https://doi.org/10.1038/nphys523
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DOI: https://doi.org/10.1038/nphys523
