Local Systems on P1 - S for S a Finite Set |
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Authors: | Prakash Belkale |
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Institution: | (1) Department of Mathematics, University of Utah, 155 S 1400 E, Salt Lake City, UT, 84112-0090, U.S.A. |
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Abstract: | I give the necessary and sufficient conditions for the existence of Unitary local systems with prescribed local monodromies on P1 – S where S is a finite set. This is used to give an algorithm to decide if a rigid local system on P1 – S has finite global monodromy, thereby answering a question of N. Katz. The methods of this article (use of Harder–Narasimhan filtrations) are used to strengthen Klyachko's theorem on sums of Hermitian matrices. In the Appendix, I give a reformulation of Mehta–Seshadri theorem in the SU(n) setting. |
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Keywords: | vector bundle Harder– Narasimhan filtration representations of fundamental groups Klyachko's theorem local systems |
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