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Pseudoconvex domains with smooth boundary in projective spaces

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Abstract

Given a pseudoconvex domain U with \(\mathscr {C}^1\)-boundary in \({\mathbb {P}}^n,\) \(n\geqslant 3,\) we show that if \(H^{2n-2}_{\mathrm{dR}}(U)\,\,\ne \,0,\) then there is a strictly psh function in a neighborhood of \(\partial U.\) We also solve the \({{{\overline{\partial }}}}\)-equation in \(X={\mathbb {P}}^n\setminus U,\) for data in \(\mathscr {C}^\infty _{(0,1)}(X).\) We discuss Levi-flat domains in surfaces. If Z is a real algebraic hypersurface in \({\mathbb {P}}^2,\) (resp a real-analytic hypersurface with a point of strict pseudoconvexity), then there is a strictly psh function in a neighborhood of Z.

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Acknowledgements

It is a pleasure to thank Bo Berndtsson and Tien-Cuong Dinh for their insightful comments and the referee for his questions.

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Correspondence to Nessim Sibony.

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Sibony, N. Pseudoconvex domains with smooth boundary in projective spaces. Math. Z. 298, 625–637 (2021). https://doi.org/10.1007/s00209-020-02613-6

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