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ESSENTIAL PROPERTIES OF THE VACUUM SECTOR FOR A THEORY OF SUPERSELECTION SECTORS

GIUSEPPE RUZZI

Dipartimento di Matematica, Università di Roma "Tor Vergata", Via della Ricerca Scientifica I-00133, Roma, Italy

https://doi.org/10.1142/S0129055X03001874Cited by:4 (Source: Crossref)

Abstract

As a generalization of DHR analysis, the superselection sectors are studied in the absence of the spectrum condition for the reference representation. Considering a net of local observables in 4-dimensional Minkowski spacetime, we associate to a set of representations, that are local excitations of a reference representation fulfilling Haag duality, a symmetric tensor C*-category of bimodules of the net, with subobjects and direct sums. The existence of conjugates is studied introducing an equivalent formulation of the theory in terms of the presheaf associated with the observable net. This allows us to find, under the assumption that the local algebras in the reference representation are properly infinite, necessary and sufficient conditions for the existence of conjugates. Moreover, we present several results that suggest how the mentioned assumption on the reference representation can be considered essential also in the case of theories in curved spacetimes.

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