Two remarks on a generalized Davey-Stewartson system

We present two results on a generalized Davey-Stewartson system, both following from the pseudo-conformal invariance of its solutions. In the hyperbolic-elliptic-elliptic case, under some conditions on the physical parameters, we establish a blow-up profile. These conditions turn out to be necessary conditions for the existence of a special "radial" solution. In the elliptic-elliptic-elliptic case, under milder conditions, we show the Lp-norms of the solutions decay to zero algebraically in time for 2<p<∞.