Existence of solutions to a class of Kazdan-Warner equations on compact Riemannian surface |
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Authors: | Yunyan Yang Xiaobao Zhu |
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Institution: | 1.Department of Mathematics,Renmin University of China,Beijing,China |
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Abstract: | Let (Σ, g) be a compact Riemannian surface without boundary and λ1(Σ) be the first eigenvalue of the Laplace-Beltrami operator Δ g . Let h be a positive smooth function on Σ. Define a functional \({J_{\alpha ,\beta }}\left( u \right) = \frac{1}{2}\int_\sum {\left( {{{\left| {{\nabla _g}u} \right|}^2} - \alpha {u^2}} \right)} d{v_g} - \beta \log \int_\sum {h{e^u}} d{v_g}\) on a function space H = {u ∈ W1,2(Σ): ∫Σ udv g = 0}. If α < λ1(Σ) and Jα;8π has no minimizer on H, then we calculate the infimum of Jα;8π on H by using the method of blow-up analysis. As a consequence, we give a sufficient condition under which a Kazdan-Warner equation has a solution. If α ≥ λ1(Σ), then infu2H Jα;8π(u) = ?∞. If β > 8π, then for any α ∈ R, there holds infu∈HJα,β(u) = ?∞. Moreover, we consider the same problem in the case that α is large, where higher order eigenvalues are involved. |
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