The N-eigenvalue Problem and Two Applications

Abstract

We consider the classification problem for compact Lie groups $G\subset U(n)$ which are generated by a single conjugacy class with a fixed number $N$ of distinct eigenvalues. We give an explicit classification when N=3, and apply this to extract information about Galois representations and braid group representations.

30 pages. version 3: many typos fixed, section 6 substantially reorganized. To appear in Int. Math. Res. Not

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