Explicit symmetry breaking
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In theoretical physics, explicit symmetry breaking is the act of breaking symmetry of a theory by adding terms to its defining equations of motion (most typically, to the Lagrangian or the Hamiltonian) that do not respect the symmetry.
Explicit symmetry breaking differs from spontaneous symmetry breaking. In the latter, the defining equations respect the symmetry but the ground state (vacuum) of the theory breaks it.
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