The Group of Quasisymmetric Homeomorphisms of the Circle and Quantization of the Universal Teichmüller Space

Details The Group of Quasisymmetric Homeomorphisms of the Circle and Quantization of the Universal Teichmüller Space The Group of Quasisymmetric Homeomorphisms of the Circle and Quantization of the Universal Teichmüller Space

2009-02-08

arxiv.org/abs/0902.1302v1

SIGMA 5 (2009), 015, 20 pages

Mathematics

Geometric Topology

Scientific paper

10.3842/SIGMA.2009.015

In the first part of the paper we describe the complex geometry of the universal Teichm\"uller space $\mathcal T$, which may be realized as an open subset in the complex Banach space of holomorphic quadratic differentials in the unit disc. The quotient $\mathcal S$ of the diffeomorphism group of the circle modulo M\"obius transformations may be treated as a smooth part of $\mathcal T$. In the second part we consider the quantization of universal Teichm\"uller space $\mathcal T$. We explain first how to quantize the smooth part $\mathcal S$ by embedding it into a Hilbert-Schmidt Siegel disc. This quantization method, however, does not apply to the whole universal Teichm\"uller space $\mathcal T$, for its quantization we use an approach, due to Connes.

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