An Algebraic Characterization of Vacuum States in Minkowski Space. III. Reflection Maps

Details An Algebraic Characterization of Vacuum States in Minkowski Space. III. Reflection Maps An Algebraic Characterization of Vacuum States in Minkowski Space. III. Reflection Maps

2003-09-09

arxiv.org/abs/math-ph/0309023v2

Commun.Math.Phys. 246 (2004) 625-641

Physics

Mathematical Physics

20 pages; change of title, reference added; version as to appear in Commun. Math. Phys

Scientific paper

10.1007/s00220-004-1060-4

Employing the algebraic framework of local quantum physics, vacuum states in Minkowski space are distinguished by a property of geometric modular action. This property allows one to construct from any locally generated net of observables and corresponding state a continuous unitary representation of the proper Poincare group which acts covariantly on the net and leaves the state invariant. The present results and methods substantially improve upon previous work. In particular, the continuity properties of the representation are shown to be a consequence of the net structure, and surmised cohomological problems in the construction of the representation are resolved by demonstrating that, for the Poincare group, continuous reflection maps are restrictions of continuous homomorphisms.

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