Vanishing of the top Chern classes of the moduli of vector bundles

Details Vanishing of the top Chern classes of the moduli of vector bundles Vanishing of the top Chern classes of the moduli of vector bundles

2004-03-02

arxiv.org/abs/math/0403033v2

Mathematics

Algebraic Geometry

Scientific paper

Let $Y$ be a smooth projective curve of genus $g\ge 2$ and let $M_{r,d}(Y)$ be the moduli space of stable vector bundles of rank $r$ and degree $d$ on $Y$. A classical conjecture of Newstead and Ramanan states that $ c_i(M_{2,1}(Y))=0$ for $i>2(g-1)$ i.e. the top $2g-1$ Chern classes vanish. The purpose of this paper is to generalize this vanishing result to the rank 3 case by generalizing Gieseker's degeneration method. More precisely, we prove that $c_i(M_{3,1}(Y))=0$ for $i>6g-5$. In other words, the top $3g-3$ Chern classes vanish. Notice that we also have $c_i(M_{3,2}(Y))=0$ for $i>6g-5$.

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