Accidental symmetry
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Lua error in package.lua at line 80: module 'strict' not found. In physics, in renormalization theory, an accidental symmetry is a symmetry which is present in a renormalizable theory only because the terms which break it have too high a dimension to appear in the Lagrangian.
In the standard model, the lepton number and the baryon number are accidental symmetries, while in lattice models, rotational invariance is accidental.
See also
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