arXiv2026
We establish sharp boundary asymptotics for directional derivatives and monotonicity of positive weak solutions to $-Δ_p u+\vartheta|\nabla u|^q=u^{-γ}+f(u)$ in the half-space $\mathbb R^N_+$ with zero Dirichlet data, where $p>1$, $γ>0$, $0 1),\\ (1-\log t)^{-\frac1p}\,\partial_ηu(x',t) &\longrightarrow \left(\frac{p}{p-1}\right)^{\frac1p} \langleη,e_N\rangle && (γ=1), \end{aligned} \] where $C_{γ,p}=\bigl((γ+p-1)^p/[p^{p-1}(p-1)(γ-1)]\bigr)^{1/(γ+p-1)}$. The convergence is uniform in the tangential variable; in particular, the appropriately rescaled tangential derivatives vanish and the leading constants depend only on $p$ and $γ$, not on the gradient term or $f$. The normal-derivative limits imply the corresponding exact leading-order boundary profiles of $u$ by integration. In the weakly singular regime $0<γ<1$, we obtain linear boundary bounds and positive inward directional-derivative estimates. We also establish local counterparts of the boundary results for solutions merely locally bounded up to the boundary. Finally, under additional structural assumptions, the moving-plane method yields normal monotonicity for strip-bounded solutions in arbitrary dimension and for locally bounded solutions in dimension two. The boundary asymptotics hold throughout the range $0<q\le p$.