Abstract
The physical observables of a quantum system are represented by the symmetric (self-adjoint) operators on the Hilbert space of pure states of the system (see Sects. 2.3.1 and in 2.3.3). They thus generate (by addition and multiplication) the set of all (not necessary symmetric) operators on the Hilbert space. This set forms an associative but non-commutative complex algebra of operators.
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Notes
- 1.
The exact definition of the spectrum is slightly different for a general real Banach algebra.
- 2.
See below for a more precise definition and discussion. For many authors the term of superselection sectors is reserved to infinite dimensional algebras which do have inequivalent representations.
- 3.
in the mathematic sense: they are not defined with reference to a given representation such as operators in Hilbert space, path integrals, etc.
- 4.
Unitary with respect to the real algebra structure, i.e. unitary or antiunitary w.r.t. the complex algebra structure.
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David, F. (2015). The Algebraic Quantum Formalism. In: The Formalisms of Quantum Mechanics. Lecture Notes in Physics, vol 893. Springer, Cham. https://doi.org/10.1007/978-3-319-10539-0_3
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