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On the Image of Certain Extension Maps. I

Published online by Cambridge University Press:  20 November 2018

Israel Moreno Mejía
Israel Moreno Mejía*
Affiliation:
Instituto de Matemáticas, Universidad Nacional Autónoma de México, México, D.F. C.P. 04510, México e-mail: [email protected]
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Abstract

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Let $X$ be a smooth complex projective curve of genus $g\ge 1$. Let $\xi \in {{J}^{1}}\left( X \right)$ be a line bundle on $X$ of degree 1. Let $W=\text{Ex}{{\text{t}}^{1}}\left( {{\xi }^{n}},{{\xi }^{-1}} \right)$ be the space of extensions of ${{\xi }^{n}}$ by ${{\xi }^{-1}}$. There is a rational map ${{D}_{\xi }}:G\left( n,W \right)\to S{{U}_{X}}\left( n+1 \right)$, where $G\left( n,W \right)$ is the Grassmannian variety of $n$-linear subspaces of $W$ and $S{{U}_{X}}\left( n+1 \right)$ is the moduli space of rank $n+1$ semi-stable vector bundles on $X$ with trivial determinant. We prove that if $n=2$, then ${{D}_{\xi }}$ is everywhere defined and is injective.

Keywords

14H6014F0514D20
Type
Research Article
Information
Canadian Mathematical Bulletin , Volume 50 , Issue 3 , 01 September 2007 , pp. 427 - 433
Copyright
Copyright © Canadian Mathematical Society 2007

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