Brill-Noether Sheaves

Abstract

We construct a ${\bar{Q}}_l$-linear Tannakian category attached to a smooth projective curve C equivalent to the category of finite dimensional ${\bar{Q}}_l$-representations Rep(G), where G is $Sp(2g-2,{\bar{Q}}_l)$ or $Sl(2g-2,{\bar{Q}}_l)$ depending on whether C is hyperelliptic or not.

version2: typos added, remarks added, new section 7.8 added version3: completes proof of theorem 11 (in the hyperelliptic case)

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