Bergman--Einstein Rigidity for Hartogs Domains over Bounded Homogeneous Domains
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866911669031010304 |
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| author | Mossa, Roberto |
| author_facet | Mossa, Roberto |
| contents | We prove a rigidity theorem for the Bergman metric on Hartogs domains over bounded homogeneous domains. Let $Ω\subset \mathbb C^n$ be a bounded homogeneous domain, let $K_Ω$ denote its Bergman kernel, and consider $$ Ω_{m,s}:=\{(z,ζ)\in Ω\times \mathbb C^m:\ \|ζ\|^2<K_Ω(z,\bar z)^{-s}\}, \qquad m\ge 1,\quad s>-C_Ω. $$ For $s\neq 0$, we prove that the following conditions are equivalent: the Bergman metric of $Ω_{m,s}$ is Kähler--Einstein; $Ω_{m,s}$ is homogeneous; $Ω_{m,s}$ is biholomorphic to $\mathbb B^{n+m}$; and $Ω\cong\mathbb B^n$ with $s=\frac1{n+1}$.
This gives a positive answer to Yau's question within this class and may be viewed as a Cheng-type rigidity phenomenon beyond the smoothly bounded strictly pseudoconvex setting. The proof combines the explicit formula for the Bergman kernel of $Ω_{m,s}$ with the structural invariants of the bounded homogeneous base. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_15880 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Bergman--Einstein Rigidity for Hartogs Domains over Bounded Homogeneous Domains Mossa, Roberto Differential Geometry Complex Variables 32A25, 32Q20, 32M10, 32Q15, 53C55 We prove a rigidity theorem for the Bergman metric on Hartogs domains over bounded homogeneous domains. Let $Ω\subset \mathbb C^n$ be a bounded homogeneous domain, let $K_Ω$ denote its Bergman kernel, and consider $$ Ω_{m,s}:=\{(z,ζ)\in Ω\times \mathbb C^m:\ \|ζ\|^2<K_Ω(z,\bar z)^{-s}\}, \qquad m\ge 1,\quad s>-C_Ω. $$ For $s\neq 0$, we prove that the following conditions are equivalent: the Bergman metric of $Ω_{m,s}$ is Kähler--Einstein; $Ω_{m,s}$ is homogeneous; $Ω_{m,s}$ is biholomorphic to $\mathbb B^{n+m}$; and $Ω\cong\mathbb B^n$ with $s=\frac1{n+1}$. This gives a positive answer to Yau's question within this class and may be viewed as a Cheng-type rigidity phenomenon beyond the smoothly bounded strictly pseudoconvex setting. The proof combines the explicit formula for the Bergman kernel of $Ω_{m,s}$ with the structural invariants of the bounded homogeneous base. |
| title | Bergman--Einstein Rigidity for Hartogs Domains over Bounded Homogeneous Domains |
| topic | Differential Geometry Complex Variables 32A25, 32Q20, 32M10, 32Q15, 53C55 |
| url | https://arxiv.org/abs/2604.15880 |