A Projective Representation of the Modular Group
Published in arXiv, 2020
Quantum Teichmuller theory assigns invariants to three-manifolds via projective representations of mapping class groups derived from the representation of a noncommutative torus. Here, we focus on a representation of the simplest non-commutative torus which remains fixed by all elements of the mapping class group of the torus, \(SL_2(\mathbb{Z})\). Also known as the modular group. We use this representation to associate a matrix to each element of \(SL_2(\mathbb{Z})\); we then compute the trace and determinant of the associated matrix.