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arXiv · 1508.07625

The normal bundle of a rational curve on a generic quintic threefold

B. Wang
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Abstract

This is another proof of the same result in [9]. Let $X_0$ be a generic quintic hypersurface in $\mathbf P^4$ over $\mathbb C$ and $c_0$ a regular map $\mathbf P^1\to X_0$ that is generically one-to-one to its image. In this paper, we show (1) $c_0$ must be an immersion, i.e. the differential $(c_0)_\ast: T_{t}\mathbf P^1 \to T_{c_0(t)} X_0$ is injective at each $t\in \mathbf P^1$, (2) the normal bundle of $c_0$ satisfies $$H^1(N_{c_0/X_0})=0.$$

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B. Wang. 2015-08-30. The normal bundle of a rational curve on a generic quintic threefold. https://arxiv.org/abs/1508.07625

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