Pseudo-index of Fano manifolds and smooth blow-ups

Details Pseudo-index of Fano manifolds and smooth blow-ups Pseudo-index of Fano manifolds and smooth blow-ups

2003-09-29

arxiv.org/abs/math/0309460v1

Mathematics

Algebraic Geometry

Scientific paper

Suppose $\pi : X \to Y$ is a smooth blow-up along a submanifold $Z$ of $Y$ between complex Fano manifolds $X$ and $Y$ of pseudo-indices $i_X$ and $i_Y$ respectively (recall that $i_X$ is defined by $i_X := \min \{-K_X \cdot C | C {is a rational curve of} X\}$). We prove that $i_X \leq i_Y$ if $2\dim (Z)< \dim(Y) + i_Y -1$ and show that this result is optimal by classifying the ``boundary'' cases. As expected, these results are obtained by studying rational curves on $X$ and $Y$.

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