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A diagram used to prove that quantum gravity cannot have any global symmetry. Symmetry, if existed, could act only on the shaded regions in the diagram and causes no change around the black spot in the middle. The shaded regions can be made as small as we like by dividing the boundary circle more and more. Thus, the alleged symmetry would not act anywhere inside of the circle. Contradiction. (Credit: Harlow and Ooguri)
Using holography, researchers have found when gravity is combined with quantum mechanics, symmetry is not possible. A new study by a pair of researchers in the US and Japan has found that, when gravity is combined with quantum mechanics, symmetry is not possible.
“Many physicists believe that there must a beautiful set of laws in Nature and that one way to quantify ...
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