On the asymptotics of quantum SU(2) representations of mapping class groups

Details On the asymptotics of quantum SU(2) representations of mapping class groups On the asymptotics of quantum SU(2) representations of mapping class groups

2004-09-27

arxiv.org/abs/math/0409503v2

Forum Math. 18 (2006), 293--304.

Mathematics

Quantum Algebra

Scientific paper

We investigate the rigidity and asymptotic properties of quantum SU(2) representations of mapping class groups. In the spherical braid group case the trivial representation is not isolated in the family of quantum SU(2) representations. In particular, they may be used to give an explicit check that spherical braid groups and hyperelliptic mapping class groups do not have Kazhdan's property (T). On the other hand, the representations of the mapping class group of the torus do not have almost invariant vectors, in fact they converge to the metaplectic representation of SL(2,Z) on L^2(R). As a consequence we obtain a curious analytic fact about the Fourier transform on the real line which may not have been previously observed.

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