Higher-Dimensional Algebra II: 2-Hilbert Spaces

Details Higher-Dimensional Algebra II: 2-Hilbert Spaces Higher-Dimensional Algebra II: 2-Hilbert Spaces

1996-09-17

arxiv.org/abs/q-alg/9609018v2

Adv. Math. 127 (1997), 125-189.

Mathematics

Quantum Algebra

63 pages, LaTeX, 11 figures in encapsulated Postscript, 2 stylefiles

Scientific paper

A 2-Hilbert space is a category with structures and properties analogous to those of a Hilbert space. More precisely, we define a 2-Hilbert space to be an abelian category enriched over Hilb with a *-structure, conjugate-linear on the hom-sets, satisfying = = . We also define monoidal, braided monoidal, and symmetric monoidal versions of 2-Hilbert spaces, which we call 2-H*-algebras, braided 2-H*-algebras, and symmetric 2-H*-algebras, and we describe the relation between these and tangles in 2, 3, and 4 dimensions, respectively. We prove a generalized Doplicher-Roberts theorem stating that every symmetric 2-H*-algebra is equivalent to the category Rep(G) of continuous unitary finite-dimensional representations of some compact supergroupoid G. The equivalence is given by a categorified version of the Gelfand transform; we also construct a categorified version of the Fourier transform when G is a compact abelian group. Finally, we characterize Rep(G) by its universal properties when G is a compact classical group. For example, Rep(U(n)) is the free connected symmetric 2-H*-algebra on one even object of dimension n.

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