A problem of Kollar and Larsen on finite linear groups and crepant resolutions

Details A problem of Kollar and Larsen on finite linear groups and crepant resolutions A problem of Kollar and Larsen on finite linear groups and crepant resolutions

2010-09-13

arxiv.org/abs/1009.2535v1

Mathematics

Group Theory

55 pages

Scientific paper

The notion of age of elements of complex linear groups was introduced by M. Reid and is of importance in algebraic geometry, in particular in the study of crepant resolutions and of quotients of Calabi-Yau varieties. In this paper, we solve a problem raised by J. Kollar and M. Larsen on the structure of finite irreducible linear groups generated by elements of age at most 1. More generally, we bound the dimension of finite irreducible linear groups generated by elements of bounded deviation. As a consequence of our main results, we derive some properties of symmetric spaces for the unitayr group having shortest closed geodesics of bounded length, and of quotients of affine space by a finite group having a crepant resolution.

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