arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2307.03390math.CVmath.AG
收藏

秩差较小时有界对称域之间的逆紧全纯映射

Proper holomorphic maps between bounded symmetric domains with small rank differences

Sung-Yeon Kim, Ngaiming Mok, Aeryeong Seo

AI总结:

本文研究秩差较小时不可约有界对称域间逆紧全纯映射的刚性,刻画了映射的标准嵌入分解形式,证明了部分域型组合下映射不存在,通过边界值构造模空间映射并结合几何子结构刚性完成证明。

摘要:

本文研究不可约有界对称域Ω与Ω'之间逆紧全纯映射$f\from Ω\toΩ'$在秩差满足$2 \text{rank}(Ω')< 2\rank(Ω)-1$时的刚性。更确切地说,若Ω与Ω'同型,或Ω为III型而Ω'为I型,则在自同构意义下,$f$形如$f=\circ F$,其中$F = F_1\times F_2\from Ω\to Ω_1'\times Ω_2'$。此处$Ω_1'$、$Ω_2'$为有界对称域,映射$F_1\from Ω\to Ω_1'$是标准嵌入,$F_2: Ω\to Ω_2'$,而$\from Ω'_1\times Ω'_2 \to Ω'$是全测地全纯等距嵌入。此外我们证明,在上述秩条件下,若Ω为I型而Ω'为III型,或Ω为II型而Ω'为I型或III型,则不存在逆紧全纯映射$f: Ω\to Ω'$。通过考察逆紧全纯映射在Ω的极大边界分支上的边界值,我们构造了Ω与Ω'的紧对偶的子格拉斯曼流形的模空间之间的有理映射,以及混合符号CR超曲面之间的诱导CR映射,从而迫使模映射满足强局部微分几何约束(或证明此类模映射不存在),并借助皮卡数为1的有理齐次空间的某些容许对上的几何子结构刚性结果完成证明。

英文摘要:

In this paper we study the rigidity of proper holomorphic maps $f\colon Ω\toΩ'$ between irreducible bounded symmetric domains $Ω$ and $Ω'$ with small rank differences: $2\leq \text{rank}(Ω')< 2\,\text{rank}(Ω)-1$. More precisely, if either $Ω$ and $Ω'$ have the same type or $Ω$ is of type~III and $Ω'$ is of type~I, then up to automorphisms, $f$ is of the form $f=\imath\circ F$, where $F = F_1\times F_2\colon Ω\to Ω_1'\times Ω_2'$. Here $Ω_1'$, $Ω_2'$ are bounded symmetric domains, the map $F_1\colon Ω\to Ω_1'$ is a standard embedding, $F_2: Ω\to Ω_2'$, and $\imath\colon Ω'_1\times Ω'_2 \to Ω'$ is a totally geodesic holomorphic isometric embedding. Moreover we show that, under the rank condition above, there exists no proper holomorphic map $f: Ω\to Ω'$ if $Ω$ is of type~I and $Ω'$ is of type~III, or $Ω$ is of type~II and $Ω'$ is either of type~I or III. By considering boundary values of proper holomorphic maps on maximal boundary components of $Ω$, we construct rational maps between moduli spaces of subgrassmannians of compact duals of $Ω$ and $Ω'$, and induced CR-maps between CR-hypersurfaces of mixed signature, thereby forcing the moduli map to satisfy strong local differential-geometric constraints (or that such moduli maps do not exist), and complete the proofs from rigidity results on geometric substructures modeled on certain admissible pairs of rational homogeneous spaces of Picard number 1.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑