### 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**... between states 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 ... so that the field everywhere points in the same direction, there is an additional infinity of

**superselection sectors**, each labelled by a different value of the unbroken SO(2) charge ... state, there is a mass gap for the

**superselection sectors**labeled by a nonzero integer, because the topological solitons are massive even infinitely massive ...

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