Structures and Diagrammatics of Four Dimensional Topological Lattice Field Theories

Details Structures and Diagrammatics of Four Dimensional Topological Lattice Field Theories Structures and Diagrammatics of Four Dimensional Topological Lattice Field Theories

1998-06-05

arxiv.org/abs/math/9806023v1

Mathematics

Geometric Topology

80 pages, 57 figures

Scientific paper

Crane and Frenkel proposed a state sum invariant for triangulated 4-manifolds.They defined and used new algebraic structures called Hopf categories for their construction. Crane and Yetter studied Hopf categories and gave some examples using group cocycles that are associated to the Drinfeld double of a finite group. In this paper we define a state sum invariant of triangulated 4-manifolds using Crane-Yetter cocycles as Boltzmann weights. Our invariant generalizes the 3-dimensional invariants defined by Dijkgraaf and Witten and the invariants that are defined via Hopf algebras. We present diagrammatic methods for the study of such invariants that illustrate connections between Hopf categories and moves to triangulations.

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