ON RADIATING STELLAR COLLAPSE WITH SHEAR

Relativistic models of radiating stellar collapse with shear require c areful checking of all the equations and quantities involved. We illus trate this by showing that, in a recently proposed model, the metric a nsatz is in fact too restrictive to allow any radial evolution to occu r, and only tangential evolution is possible. Furthermore, the assumpt ion of pressure isotropy is shown to reduce the model to the static ca se without radiation or shear.