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The Benefits of Supersymmetry in Particle Physics
Theory of supersymmetry is this symmetry between bosons and fermions. It's both super highly constrained in the sense that it is hard to write down theories of particle physics that are actually supersymmetric. The more supersymmetry you try to throw in, the more constrained things become. There's a natural living place for loop quantum gravity which is 3 plus 1-dimensional spacetime.