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- W2981760106 abstract "A ribbon is a non-reduced curve modelled on the first infinitesimal neighbourhood of a smooth curve in a surface. This paper is devoted to describe some properties of coherent sheaves on such a curve and their Simpson moduli space. In particular we give necessary and sufficent conditions for the existence of semistable quasi locally free sheaves (in the sense of Drezet) of a fixed complete type and we compute the dimension of the Zariski closure in the moduli space of the locus of semistable quasi locally free sheaves of a fixed complete type. We also show when vector bundles on the reduced subcurve deform to sheaves supported on the ribbon. We find a special kind of non quasi locally free sheaves which, as generalized line bundles, are direct images of quasi locally free sheaves on an appropriate blow up of the ribbon. Finally, we give a conjectural description of the irreducible components of the Simpson moduli space, explaining precisely which parts have already been proved and what lacks for the complete result." @default.
- W2981760106 created "2019-11-01" @default.
- W2981760106 creator A5035983206 @default.
- W2981760106 date "2019-02-22" @default.
- W2981760106 modified "2023-09-27" @default.
- W2981760106 title "Coherent Sheaves on Ribbons and their Moduli" @default.
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