Mathematics – Differential Geometry
Scientific paper
2009-02-12
Journal of Geometry and Physics 60 (2010), pp. 1903-1918
Mathematics
Differential Geometry
25 pages, added section on global aspects
Scientific paper
10.1016/j.geomphys.2010.07.006
We study the natural structure on the moduli space of deformations of compact coassociative submanifolds. We show that a G2-manifold with a T^4-action of isomorphisms such that the orbits are coassociative tori is locally equivalent to a minimal 3-manifold in R^{3,3} = H^2(T^4,R) with positive induced metric. By studying minimal surfaces in quadrics we show how to construct minimal 3-manifold cones in R^{3,3} and hence G2-metrics from equations similar to a set of affine Toda equations. The relation to semi-flat special Lagrangian fibrations and the Monge-Amp\`ere equation are explained.
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