Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1993-06-22
Nucl.Phys. B415 (1994) 557-588
Physics
High Energy Physics
High Energy Physics - Theory
24 pages, plain TeX, Princeton preprint PUPT-1406, June 1993
Scientific paper
10.1016/0550-3213(94)90303-4
We introduce the notion of rational Hopf algebras that we think are able to describe the superselection symmetries of two dimensional rational quantum field theories. As an example we show that a six dimensional rational Hopf algebra $H$ can reproduce the fusion rules, the conformal weights, the quantum dimensions and the representation of the modular group of the chiral Ising model. $H$ plays the role of the global symmetry algebra of the chiral Ising model in the following sense: 1) a simple field algebra $\FA$ and a representation $\pi$ on $\HS_\pi$ of it is given, which contains the $c=1/2$ unitary representations of the Virasoro algebra as subrepresentations; 2) the embedding $U\colon H\to\BOH$ is such that the observable algebra $\pi(\OA)^-$ is the invariant subalgebra of $\BOH$ with respect to the left adjoint action of $H$ and $U(H)$ is the commutant of $\pi(\OA)$; 3) there exist $H$-covariant primary fields in $\BOH$, which obey generalized Cuntz algebra properties and intertwine between the inequivalent sectors of the observables.
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