The Geometric Dual of a-maximisation for Toric Sasaki-Einstein Manifolds

Details The Geometric Dual of a-maximisation for Toric Sasaki-Einstein Manifolds The Geometric Dual of a-maximisation for Toric Sasaki-Einstein Manifolds

2005-03-24

arxiv.org/abs/hep-th/0503183v3

Commun.Math.Phys.268:39-65,2006

Physics

High Energy Physics

High Energy Physics - Theory

35 pages, 4 figures; v2 minor changes; v3 typos corrected, eqn 2.60 removed, published version

Scientific paper

10.1007/s00220-006-0087-0

We show that the Reeb vector, and hence in particular the volume, of a Sasaki-Einstein metric on the base of a toric Calabi-Yau cone of complex dimension n may be computed by minimising a function Z on R^n which depends only on the toric data that defines the singularity. In this way one can extract certain geometric information for a toric Sasaki-Einstein manifold without finding the metric explicitly. For complex dimension n=3 the Reeb vector and the volume correspond to the R-symmetry and the a central charge of the AdS/CFT dual superconformal field theory, respectively. We therefore interpret this extremal problem as the geometric dual of a-maximisation. We illustrate our results with some examples, including the Y^{p,q} singularities and the complex cone over the second del Pezzo surface.

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