Central extensions of the Ptolemy-Thompson group and quantized Teichmuller theory
Geometric Topology
2014-02-26 v2
Abstract
The central extension of the Thompson group that arises in the quantized Teichm\"uller theory is 12 times the Euler class. This extension is obtained by taking a (partial) abelianization of the so-called braided Ptolemy-Thompson group introduced and studied in \cite{FK2}. We describe then the cyclic central extensions of by means of explicit presentations.
Keywords
Cite
@article{arxiv.0802.2996,
title = {Central extensions of the Ptolemy-Thompson group and quantized Teichmuller theory},
author = {Louis Funar and Vlad Sergiescu},
journal= {arXiv preprint arXiv:0802.2996},
year = {2014}
}
Comments
26 p