Radial symmetry and applications for a problem involving the $-Δ_p(\cdot)$ operator and critical nonlinearity in~$\mathbb{R}^N$

We consider weak non-negative solutions to the critical $p$-Laplace equation in $\mathbb{R}^N$, $-Δ_p u =u^{p^*-1}$ in the singular case $1<p<2$. We prove that if the nonlinearity is locally Lipschitz continuous, namely $p^*\geqslant2$ then all the solutions in ${\mathcal D}^{1,p}(\R^N)$ are radial (and radially decreasing) about some point.

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