Steps towards lattice Virasoro algebras: su(1,1)

An explicit construction is presented for the action of the su(1,1)-subalgebra of the Virasoro algebra on path spaces for the c(2,q) minimal models. In the case of the Lee-Yang model, we show how this action already fixes the central charge of the full Virasoro algebra. For this case, we additionally construct a representation in terms of generators of the corresponding Temperley-Lieb algebra.