On the traceless SU(2) character variety of the 6-punctured 2-sphere

We exhibit the traceless $SU(2)$ character variety of a 6-punctured 2-sphere as a 2-fold branched cover of ${\mathbb{C}}P^3$ , branched over the singular Kummer surface, with the branch locus in $R(S^2,6)$ corresponding to the binary dihedral representations. This follows from an analysis of the map induced on $SU(2)$ character varieties by the 2-fold branched cover $F_{n-1}\to S^2$ branched over $2n$ points, combined with the theorem of Narasimhan–Ramanan which identifies $R(F_2)$ with ${\mathbb{C}}P^3$ . The singular points of $R(S^2,6)$ correspond to abelian representations, and we prove that each has a neighborhood in $R(S^2,6)$ homeomorphic to a cone on $S^2\times S^3$ .


Publication Date:
2017
Date Submitted:
Jul 13 2018
ISSN:
1793-6527
Citation:
Journal of Knot Theory and its Ramifications. T. Cochran memorial volume
26
2
Note:
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 Record created 2018-07-13, last modified 2019-04-03


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