Twisted connected sums and special Riemannian holonomy

Details Twisted connected sums and special Riemannian holonomy Twisted connected sums and special Riemannian holonomy

2000-12-19

arxiv.org/abs/math/0012189v4

J. Reine Angew. Math. 565 (2003), 125--160

Mathematics

Differential Geometry

35 pages; v2: some technical corrections and clarifications, more general and systematic treatment of the examples; v3: techni

Scientific paper

We give a new, connected-sum-like construction of Riemannian metrics with special holonomy G_2 on compact 7-manifolds. The construction is based on a gluing theorem for appropriate elliptic partial differential equations. As a prerequisite, we also obtain asymptotically cylindrical Riemannian manifolds with holonomy SU(3) building up on the work of Tian and Yau. Examples of new topological types of compact 7-manifolds with holonomy G_2 are constructed using Fano 3-folds.

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