Abstract
Let (Σ, g) be a compact Riemann surface with smooth boundary ∂E, ∆g be the Laplace-Beltrami operator, and h be a positive smooth function. Using a min-max scheme introduced by Djadli and Malchiodi (2008) and Djadli (2008), we prove that if Σ is non-contractible, then for any ρ Σ (8kπ, 8(k +1)π) with k Σ ℕ*, the mean field equation
has a solution. This generalizes earlier existence results of Ding et al. (Ann Inst H Poincaré Anal Non Linéaire, 1999) and Chen and Lin (2003) in the Euclidean domain. Also we consider the corresponding Neumann boundary value problem. If h is a positive smooth function, then for any ρ ∈ (4kπ, 4(k + 1)π) with k ∈ ℕ*, the mean field equation
has a solution, where v denotes the unit normal outward vector on ∂Σ. Note that in this case we do not require the surface to be non-contractible.
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Acknowledgements
This work was supported by National Natural Science Foundation of China (Grant No. 11721101) and the National Key Research and Development Project (Grant No. SQ2020YFA070080). The second author was supported by Hubei Provincial Natural Science Foundation of China (Grant No. 2021CFB400) and National Natural Science Foundation of China (Grant No. 11971358).
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Li, J., Sun, L. & Yang, Y. The boundary value problem for the mean field equation on a compact Riemann surface. Sci. China Math. 66, 115–142 (2023). https://doi.org/10.1007/s11425-021-1962-5
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DOI: https://doi.org/10.1007/s11425-021-1962-5