Mathematics – Differential Geometry
Scientific paper
2008-09-24
Comm. Anal. Geom. 17 (2009) 481-503
Mathematics
Differential Geometry
13 pages; minor corrections, numbering changed to match print version
Scientific paper
We study how a gluing construction, which produces compact manifolds with holonomy G_2 from matching pairs of asymptotically cylindrical G_2-manifolds, behaves under deformations. We show that the gluing construction defines a smooth map from a moduli space of gluing data to the moduli space of torsion-free G_2-structures on the glued manifold, and that this is a local diffeomorphism. We use this to partially compactify the moduli space of torsion-free G_2-structures, including it as the interior of a topological manifold with boundary. The boundary points are equivalence classes of matching pairs of torsion-free asymptotically cylindrical G_2-structures.
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