New Results in Sasaki-Einstein Geometry

Details New Results in Sasaki-Einstein Geometry New Results in Sasaki-Einstein Geometry

2007-01-18

arxiv.org/abs/math/0701518v3

Mathematics

Differential Geometry

31 pages, no figures. Invited contribution to the proceedings of the conference "Riemannian Topology: Geometric Structures on

Scientific paper

This article is a summary of some of the author's work on Sasaki-Einstein geometry. A rather general conjecture in string theory known as the AdS/CFT correspondence relates Sasaki-Einstein geometry, in low dimensions, to superconformal field theory; properties of the latter are therefore reflected in the former, and vice versa. Despite this physical motivation, many recent results are of independent geometrical interest, and are described here in purely mathematical terms: explicit constructions of infinite families of both quasi-regular and irregular Sasaki-Einstein metrics; toric Sasakian geometry; an extremal problem that determines the Reeb vector field for, and hence also the volume of, a Sasaki-Einstein manifold; and finally, obstructions to the existence of Sasaki-Einstein metrics. Some of these results also provide new insights into Kahler geometry, and in particular new obstructions to the existence of Kahler-Einstein metrics on Fano orbifolds.

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