By [various], Claude LeBrun, McKenzie Wang

ISBN-10: 1571460683

ISBN-13: 9781571460684

The Surveys in Differential Geometry are supplementations to the magazine of Differential Geometry, that are released via overseas Press. They comprise major invited papers combining unique examine and overviews of the most up-tp-date study in particular parts of curiosity to the starting to be magazine of Differential Geometry neighborhood. The survey volumes function carrying on with references, inspirations for brand spanking new learn, and introductions to the diversity of issues of curiosity to differential geometers. those vitamins are released each year when you consider that 1999. during this quantity of Surveys in Differential Geometry, we provide a complete evaluate of the essays on Einstein Manifold. we have now prepared this quantity right into a triptych. the 1st panel depicts the Einstein manifolds of distinct holonomy. the second one panel of our triptych matters innovations acceptable to the learn of normal Einstein manifolds. The final panel of our triptych harkens again to the actual inspirations of our topic. it truly is our fondest wish that this booklet could play an oblique position in settling primary questions by means of refocusing the eye of the mathematical neighborhood at the many open difficulties during this attention-grabbing and critical sector of Riemannian geometry.

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Extra info for Surveys in differential geometry: essays on Einstein manifolds, Vol 6

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3. Moduli Spaces One of the most important features about hyper- Kahler structures is that there are many naturally occurring examples. In particular, the moduli spaces arising in gauge theory often carry a hyper-Kahler metric. The key fact is that such moduli spaces may often be viewed as finite-dimensional hyper-Kahler quotients of an infinite-dimensional space of connexions by an infinite-dimensional gauge group. As an example, let us consider connexions on a principal G-bundle over JR4. The space A of connexions is an infinite-dimensional affine space modelled on 0 1(JR4 ,g).

Guan's construction of compact complex-symplectic manifolds admitting no hyper-Kahler metric starts by applying Beauville's method to a Kodaira surface [33]. The resulting manifolds inherit their complex-symplectic structure from the Kodaira surface, but, like this surface, have odd first Betti number so admit no Kahler metric. Guan constructs further examples by resolving singularities of complex-symplectic quotients of his initial examples, and by taking deformations [34]. A fair amount is now known about the topology of compact hyper-Kahler manifolds.

The Taub-NUT example shows that a complex manifold (cc? in this case) may admit non-homothetic complete Ricci-flat Kahler metrics, in contrast to the situation for negative Einstein constant [17, 93]. One can also produce the multi-Taub-NUT metrics by replacing an IHI factor in the Kronheimer construction by an 1R3 x SI. It is interesting to note that these metrics may also be obtained as hyper-Kahler quotients by a noncompact group. For example, if IR acts on cc? x C2 by t,(ZI' Z2, WI, W2) = (e it ZI, e-itz2, WI + t, W2), then the hyper-Kahler quotient is the Taub-NUT metric [6].

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Surveys in differential geometry: essays on Einstein manifolds, Vol 6 by [various], Claude LeBrun, McKenzie Wang


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