NEW REALIZATIONS OF W ALGEBRAS AND W STRINGS
Hong Lu, C.N. Pope, Stany Schrans, X.J. Wang · Modern Physics Letters A · 1992
We discuss new realizations of W algebras in which the currents are expressed in terms of two arbitrary commuting energy-momentum tensors together with a set of free scalar fields. This contrasts with the previously-known realizations, which involve only one energy-momentum tensor. Since realizations of nonlinear algebras are not easy to come by, the fact that this new class exists is of intrinsic interest. We use these new realizations to build the corresponding W-string theories and show that they are effectively described by two independent ordinary Virasoro-like strings.