Non-degeneracy for the critical Lane-Emden system

TL;DR

This paper establishes the non-degeneracy of solutions to the critical Lane-Emden system in all dimensions greater than or equal to 3, showing that linearized solutions are generated by system symmetries under certain decay conditions.

Contribution

It proves the non-degeneracy of solutions to the critical Lane-Emden system for all relevant dimensions and exponents, extending previous results to a broader setting.

Findings

All solutions to the linearized system are symmetry-generated.

Non-degeneracy holds for solutions in the energy space or decaying at infinity.

Results apply to all dimensions N ≥ 3 and exponents satisfying the critical condition.

Abstract

We prove the non-degeneracy for the critical Lane--Emden system $$ -\Delta U = V^p,\quad -\Delta V = U^q,\quad U, V > 0 \quad \text{in } \mathbb{R}^N $$ for all $N \ge 3$ and $p,q > 0$ such that $\frac{1}{p+1} + \frac{1}{q+1} = \frac{N-2}{N}$. We show that all solutions to the linearized system around a ground state must arise from the symmetries of the critical Lane-Emden system provided that they belong to the corresponding energy space or they decay to 0 uniformly as the point tends to infinity.