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Preprint Aug 2026

Green function asymptotics for the $\sigma_2$-Yamabe problem

We establish, at every pole, the asymptotic expansion of the normalized $\Gamma_2$-Green function with a finite pole set in every dimension $n\ge5$. In dimensions $5\le n\le7$ the first correction is a unique nonnegative constant, whereas dimension $8$ exhibits a Weyl-driven $\sqrt{\log}$ term. For $n>8$ we construct t...

Bin Deng, Han Lu · 0 citations
Preprint Sep 2026

Liouville Theorem for the Constant $Q/R$-Curvature Equation

We study positive entire solutions of the flat constant $Q/R$-curvature equation in dimension $n\geq5$. We prove that the weak superharmonicity condition $-\Delta u\geq0$ already forces every nonconstant solution to be admissible. With this automatic admissibility, we classify all such solutions as positive constants o...

Han Lu · 0 citations
Preprint Jul 2026

Blow-up phenomena for the $\sigma_2$-Yamabe equation

For every integer $n\ge27$, we construct a smooth metric on $\mathbb S^n$ that is invariant under the antipodal map and is not locally conformally flat. For this fixed background metric, the normalized $\sigma_2$-Yamabe equation admits a noncompact family of positive $\Gamma_2^+$-admissible solutions. The main difficul...

B. Deng, Han Lu, Jun-Cheng Wei · 0 citations

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