coherent superselection sector

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Order-disorder — In quantum field theory and statistical mechanics in the thermodynamic limit, a system with a global symmetry can have more than one phase. For parameters where the symmetry is spontaneously broken, the system is said to be ordered. When the… … Wikipedia
Mathematical formulation of quantum mechanics — Quantum mechanics Uncertainty principle … Wikipedia
Critical phenomena — In physics, critical phenomena is the collective name associated with the physics of critical points. Most of them stem from the divergence of the correlation length, but also the dynamics slows down. Critical phenomena include scaling relations… … Wikipedia

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