Beyond the Large N Limit: Non-linear W(infinity) as symmetry of the SL(2,R)/U(1) coset model

I. Bakas, E. Kiritsis

We show that the symmetry algebra of the $SL(2,R{)}_k/U(1)$ coset model is a non-linear deformation of $W_{\infty }$, characterized by $k$. This is a universal $W$-algebra which lin…