Large Diffeomorphisms in (2+1)-Quantum Gravity on the Torus
Abstract
The issue of how to deal with the modular transformations -- large diffeomorphisms -- in (2+1)-quantum gravity on the torus is discussed. I study the Chern-Simons/connection representation and show that the behavior of the modular transformations on the reduced configuration space is so bad that it is possible to rule out all finite dimensional unitary representations of the modular group on the Hilbert space of -functions on the reduced configuration space. Furthermore, by assuming piecewise continuity for a dense subset of the vectors in any Hilbert space based on the space of complex valued functions on the reduced configuration space, it is shown that finite dimensional representations are excluded no matter what inner-product we define in this vector space. A brief discussion of the loop- and ADM-representations is also included.
Cite
@article{arxiv.gr-qc/9501020,
title = {Large Diffeomorphisms in (2+1)-Quantum Gravity on the Torus},
author = {Peter Peldan},
journal= {arXiv preprint arXiv:gr-qc/9501020},
year = {2011}
}
Comments
The proof for the nonexistence of the one- and two-dimensional representations of PSL(2,Z) in the relevant Hilbert space, has been extended to cover all finite dimensional unitary representations. The notation is slightly improved and a few references are added.