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Brill-Noether loci and generated torsionfree sheaves over nodal and cuspidal curves

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Abstract

We determine (semi)stability of kernels of evaluation maps of globally generated torsion-free sheaves on a nodal and cuspidal curve in some important cases. We use them to study Brill-Noether loci for torsion-free sheaves with slope μ less than two. The conditions for nonemptiness and singular sets of Brill-Noether loci are determined. Explicit descriptions of Brill-Noether loci are given in some cases. We also apply our results to study (semi)stability properties of the restrictions of the Picard bundle E d (on the compactified Jacobian) to the images of Y in the compactified Jacobian for certain embeddings.

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Authors and Affiliations

  1. School of Mathematics, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai, 400005, India

    Usha N. Bhosle & Sanjay Kumar Singh

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  1. Usha N. Bhosle
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  2. Sanjay Kumar Singh
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Correspondence to Usha N. Bhosle.

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Bhosle, U.N., Singh, S.K. Brill-Noether loci and generated torsionfree sheaves over nodal and cuspidal curves. manuscripta math. 141, 241–271 (2013). https://doi.org/10.1007/s00229-012-0571-0

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