Blow-up of non-radial solutions for the $L^2$ critical inhomogeneous NLS equation

TL;DR

This paper proves that solutions with negative energy to the $L^2$ critical inhomogeneous NLS equation blow up in finite time, extending known results beyond the radial case in higher dimensions.

Contribution

It establishes finite-time blow-up for non-radial solutions of the $L^2$ critical INLS equation with negative energy, a result previously known only for radial solutions in higher dimensions.

Findings

Negative energy solutions blow up in finite time

Extension of blow-up results to non-radial solutions

Contrasts with classical NLS where radiality was required

Abstract

We consider the $L^2$ critical inhomogeneous nonlinear Schr\"odinger (INLS) equation in $\mathbb{R}^N$ $$ i \partial_t u +\Delta u +|x|^{-b} |u|^{\frac{4-2b}{N}}u = 0, $$ where $N\geq 1$ and $0<b<2$. We prove that if $u_0\in H^1(\mathbb{R}^N)$ satisfies $E[u_0]<0$, then the corresponding solution blows-up in finite time. This is in sharp contrast to the classical $L^2$ critical NLS equation where this type of result is only known in the radial case for $N\geq 2$.