Toric geometry of Spin(7)-manifolds

Thomas Bruun Madsen, Andrew Francis Swann

Publikation: Working paper/Preprint Working paperForskning


We study Spin(7)-manifolds with an effective multi-Hamiltonian action of a four-torus. On an open dense set, we provide a Gibbons-Hawking type ansatz that describes such geometries in terms of a symmetric 4×4-matrix of functions. This description leads to the first known Spin(7)-manifolds with a rank 4 symmetry group and full holonomy. We also show that the multi-moment map exhibits the full orbit space topologically as a smooth four-manifold, containing a trivalent graph in R4 as the image of the set of the special orbits.
Antal sider14
StatusUdgivet - 1 nov. 2018


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