Spontaneous symmetry breaking occurs when the ground state does not share the symmetry of the Hamiltonian.
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Multiple authoritative physics sources confirm that spontaneous symmetry breaking describes situations where a physical system's Hamiltonian possesses a symmetry, but its ground state or vacuum solution fails to exhibit that same symmetry.
States that spontaneous symmetry-breaking occurs when the system Hamiltonian is symmetric under a certain transformation, but the equilibrium/ground states are not.
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