Gamma-ray observations shrink known grain size of spacetime

Tininess of speed differences between photons from a gamma-ray burst uphold special relativity theory

2:44pm, October 28, 2009

Smaller dots, Georges, please. In their efforts to unify quantum theory and gravity, theoretical physicists have likened spacetime to a Georges Seurat painting, composed of tiny dots or lumps that meld to form a seemingly smooth picture. But if spacetime really does have a grainy structure on the smallest scales, the cosmic painter may need to get finer brushes, a new study reveals.

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