Mathematics – Differential Geometry
Scientific paper
2004-01-15
Mathematics
Differential Geometry
Some modifications of the introduction; retrieved a small subsection; added a new section concerning Hilsum-Skandalis morphism
Scientific paper
Motivated by the computations done in \cite{C1}, where I introduced and discussed what I called the groupoid of generalized gauge transformations, viewed as a groupoid over the objects of the category $\mathsf{Bun}_{G,M}$ of principal $G$-bundles over a given manifold $M$, I develop in this paper the same ideas for the more general case of {\em principal $\calG$-bundles or principal bundles with structure groupoid $\calG$}, where now $\calG$ is a Lie groupoid in the sense of \cite{Moer2}. Most of the concepts introduced in \cite{C1} can be translated almost verbatim in the framework of principal bundles with structure groupoid $\calG$; in particular, the key r�le for the construction of generalized gauge transformations is again played by (the equivalent in the framework of principal bundles with groupoid structure of) the division map $f_P$. Of great importance are also the generalized conjugation in a groupoid and the concept of (twisted) equivariant maps between groupoid-spaces.
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