On two-Dimensional Holonomy

Details On two-Dimensional Holonomy On two-Dimensional Holonomy

2007-10-23

arxiv.org/abs/0710.4310v2

Mathematics

Differential Geometry

46 pages. Preliminary version, a perfected version will appear in Transactions of the American Matematical Society

Scientific paper

We define the thin fundamental categorical group ${\mathcal P}_2(M,*)$ of a based smooth manifold $(M,*)$ as the categorical group whose objects are rank-1 homotopy classes of based loops on $M$, and whose morphisms are rank-2 homotopy classes of homotopies between based loops on $M$. Here two maps are rank-$n$ homotopic, when the rank of the differential of the homotopy between them equals $n$. Let $\C(\Gc)$ be a Lie categorical group coming from a Lie crossed module ${\Gc= (\d\colon E \to G,\tr)}$. We construct categorical holonomies, defined to be smooth morphisms ${\mathcal P}_2(M,*) \to \C(\Gc)$, by using a notion of categorical connections, being a pair $(\w,m)$, where $\w$ is a connection 1-form on $P$, a principal $G$ bundle over $M$, and $m$ is a 2-form on $P$ with values in the Lie algebra of $E$, with the pair $(\w,m)$ satisfying suitable conditions. As a further result, we are able to define Wilson spheres in this context.

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