Mathematics – Differential Geometry
Scientific paper
2010-12-29
de Andr\'es, Luis Carlos (ed.) et al., Special metrics and supersymmetry. Bilbao, Spain, 29-31 May 2008. AIP Conference Procee
Mathematics
Differential Geometry
15 pages
Scientific paper
We first review the notion of a $G_2$-manifold, defined in terms of a principal $G_2$ ("gauge") bundle over a $7$-dimensional manifold, before discussing their relation to supergravity. In a second thread, we focus on associative submanifolds and present their deformation theory. In particular, we elaborate on a deformation problem with coassociative boundary condition. Its space of infinitesimal deformations can be identified with the solution space of an elliptic equation whose index is given by a topological formula.
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