### Some articles on *superselection sectors*:

Mathematical Formulation Of Quantum Mechanics - Mathematical Structure of Quantum Mechanics - Postulates of Quantum Mechanics

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**Superselection sectors**... and rays needs to be refined somewhat to take into account so-called**superselection sectors**... States in different**superselection sectors**cannot influence each other, and the relative phases between them are unobservable ...**Superselection Sectors**- Continuous Symmetries

... In the disordered phase, the

**superselection sectors**are described by the representation of SO(3) under which a given configuration transforms globally ... Although each such isolated configuration has infinite energy, it labels

**superselection sectors**where the difference in energy between two states is finite ... direction, there is an additional infinity of

**superselection sectors**, each labelled by a different value of the unbroken SO(2) charge ...

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