Blow-up analysis of Large conformal metrics with prescribed Gaussian and geodesic curvatures

Abstract

Consider a compact Riemannian surface $(M,g)$ with nonempty boundary and negative Euler characteristic. Given two smooth non-constant functions $f$ in $M$ and $h$ in $\partial M$ with $\max f=\max h=0$, under a suitable condition on the maximum points of $f$ and $h$, we prove that for sufficiently small positive constants $\lambda$ and $\mu$, there exist at least two distinct conformal metrics $g_{\lambda ,\mu }=e^{2u_{\mu ,\lambda }}g$ and $g^{\lambda ,\mu }=e^{2u^{\mu ,\lambda }}g$ with prescribed sign-changing Gaussian and geodesic curvature equal to $f+\mu$ and $h+\lambda ,$ respectively. Additionally, we employ the method used in Borer et al. (2015) to study the blowing up behavior of the large solution $u^{\mu ,\lambda }$ when $\mu \downarrow 0$ and $\lambda \downarrow 0$. Finally, we derive a new Liouville-type result for the half-space, eliminating one of the potential blow-up profiles.

Final version. 38 pages. References updated and some typos fixed. Improved version thanks to the anonymous referee. To appear in Calc. Var. Partial Differential Equations