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arXiv math/0411629math.AGmath.RT
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齐次丛的限制定理

Restriction theorems for homogeneous bundles

V. B. Mehta, V. Trivedi

摘要:

本文证明了对于不可约表示$τ:GL(n)\to GL(W)$,相应的齐次${\bf P}_k^n$ -向量丛$W_τ$在限制于${\bf P}_k^n$中的任意光滑二次或任意光滑三次时是强半稳定的,其中$k$分别是特征$\neq 2,3$的代数闭域.特别是$W_τ$是半稳定的时候限制到一般超曲面的程度$\geq 2$和强半稳定的时候限制到$k$ -通用超曲面的程度$\geq 2$。

英文摘要:

We prove that for an irreducible representation $τ:GL(n)\to GL(W)$, the associated homogeneous ${\bf P}_k^n$-vector bundle $W_τ$ is strongly semistable when restricted to any smooth quadric or to any smooth cubic in ${\bf P}_k^n$, where $k$ is an algebraically closed field of characteristic $\neq 2,3$ respectively. In particular $W_τ$ is semistable when restricted to general hypersurfaces of degree $\geq 2$ and is strongly semistable when restricted to the $k$-generic hypersurface of degree $\geq 2$.

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