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Remarks on the balanced metric on Hartogs triangles with integral exponent

Qiannan ZhangHuan Yang — 2023

Czechoslovak Mathematical Journal

In this paper we study the balanced metrics on some Hartogs triangles of exponent γ + , i.e., Ω n ( γ ) = { z = ( z 1 , , z n ) n : | z 1 | 1 / γ < | z 2 | < < | z n | < 1 } equipped with a natural Kähler form ω g ( μ ) : = 1 2 ( i / π ) ¯ Φ n with Φ n ( z ) = - μ 1 ln ( | z 2 | 2 γ - | z 1 | 2 ) - i = 2 n - 1 μ i ln ( | z i + 1 | 2 - | z i | 2 ) - μ n ln ( 1 - | z n | 2 ) , where μ = ( μ 1 , , μ n ) , μ i > 0 , depending on n parameters. The purpose of this paper is threefold. First, we compute the explicit expression for the weighted Bergman kernel function for ( Ω n ( γ ) , g ( μ ) ) and we prove that g ( μ ) is balanced if and only if μ 1 > 1 and γ μ 1 is an integer, μ i are integers such that μ i 2 for all i = 2 , ... , n - 1 , and μ n > 1 . Second, we prove that g ( μ ) is Kähler-Einstein if and only if μ 1 = μ 2 = = μ n = 2 λ , where λ is a nonzero...

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