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arXiv 2007.06816math.AGmath.RT
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有理齐性空间上的向量丛

Vector Bundles on Rational Homogeneous Spaces

Rong Du, Xinyi Fang, Yun Gao

摘要:

我们考虑了复数域$\mathbb{C}$上的复有理齐性空间$X$ %上的一致$r$ -丛$E$,并证明了如果$E$关于所有特殊的线族是多一致的,并且秩$r$小于或等于某个只依赖于$X$的数,则$E$要么是线丛的直和,要么是对某些$δ_i$的$δ_i$ -不稳定的.因此,我们部分回答了Muñoz-Occhetta-Solá Conde提出的问题。具体地,如果$X$是广义格拉斯曼$\mathcal{G}$,并且秩$r$小于或等于仅取决于$X$的某个数,则$E$分裂为线束的直和。当$X$是广义Grassmannian时,考虑Chow环,改进了Muñoz-Occhetta-Solá Conde的主要定理.此外,通过计算两个有理齐性空间之间的相对切丛,给出了有理齐性空间上广义Grauert-Mülich-Barth定理的显式界.

英文摘要:

We consider a uniform $r$-bundle $E$ on a complex rational homogeneous space $X$ %over complex number field $\mathbb{C}$ and show that if $E$ is poly-uniform with respect to all the special families of lines and the rank $r$ is less than or equal to some number that depends only on $X$, then $E$ is either a direct sum of line bundles or $δ_i$-unstable for some $δ_i$. So we partially answer a problem posted by Muñoz-Occhetta-Solá Conde. In particular, if $X$ is a generalized Grassmannian $\mathcal{G}$ and the rank $r$ is less than or equal to some number that depends only on $X$, then $E$ splits as a direct sum of line bundles. We improve the main theorem of Muñoz-Occhetta-Solá Conde when $X$ is a generalized Grassmannian by considering the Chow rings. Moreover, by calculating the relative tangent bundles between two rational homogeneous spaces, we give explicit bounds for the generalized Grauert-Mülich-Barth theorem on rational homogeneous spaces.

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