It is shown that the asymmetric chiral gauging of the WZW models give rise to consistent string backgrounds. The target space structure of the [SL(2,R)/SO(1, 1)]L ⊗ [SL(2,R)/U(1)]R model is analyzed and the presence of a hidden isometry in this background is demonstrated. A nonlinear coordinate transformation is obtained which transforms the asymmetric model to the symmetric one, analyzed recen...

The physical river characteristics datasets described here provide spatially consistent information to support hydrological and inundation modelling at a 1 km × resolution across the United Kingdom, on British National Grid. of gridded (outflow drainage directions, catchment areas, widths bankfull rivers depths rivers) comma-separated table NRFA (National River Flow Archive) gauging station loc...

We review some of the recent developments in the construction of W-string theories. These are generalisations of ordinary strings in which the two-dimensional " worldsheet " theory, instead of being a gauging of the Virasoro algebra, is a gauging of a higher-spin extension of the Virasoro algebra—a W algebra. Despite the complexity of the (non-linear) W algebras, it turns out that the spectrum ...