A variable coefficient nonlinear Schr��dinger equation with a four-dimensional symmetry group and blow-up of its solutions

Abstract

A canonical variable coefficient nonlinear Schr��dinger equation with a four dimensional symmetry group containing $\SL(2,\mathbb{R})$ group as a subgroup is considered. This typical invariance is then used to transform by a symmetry transformation a known solution that can be derived by truncating its Painlev�� expansion and study blow-ups of these solutions in the $L_p$-norm for $p>2$, $L_\infty$-norm and in the sense of distributions.10 pages