In the Standard Model, U(1) corresponds to the electromagnetic, SU(2) to weak, and SU(3) to strong interactions. I realize that gravity is not a part of the Standard Model. However, sometimes gravity is also viewed as a gauge theory. If so, does it correspond to any particular symmetry group or is this a wrong way of thinking and why?
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2Possible duplicate of Gravity as a gauge theory – ungerade Sep 13 '17 at 09:25
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Other possible duplicates: https://physics.stackexchange.com/q/4359/2451 , https://physics.stackexchange.com/q/12461/2451 , https://physics.stackexchange.com/q/46324/2451 , and links therein. – Qmechanic Sep 13 '17 at 09:37
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Also: https://physics.stackexchange.com/q/346793/50583 – ACuriousMind Sep 13 '17 at 10:29