Frobenius-unstable bundles and p-curvature
Algebraic Geometry
2007-05-23 v1
Abstract
We use the theory of p-curvature of connections to analyze stable vector bundles of rank 2 on curves of genus 2 which pull back to unstable bundles under the Frobenius morphism. We take two approaches, first using explicit formulas for p-curvature to analyze low-characteristic cases, and then using degeneration techniques to obtain an answer for a general curve by degenerating to an irreducible rational nodal curve, and applying the results of math.AG/0409145 and math.AG/0407445. We also apply our explicit formulas to give a new description of the strata of curves of genus 2 of different p-rank.
Cite
@article{arxiv.math/0409266,
title = {Frobenius-unstable bundles and p-curvature},
author = {Brian Osserman},
journal= {arXiv preprint arXiv:math/0409266},
year = {2007}
}
Comments
32 pages. Contents of Chapters III and VI of PhD thesis, Massachusetts Institute of Technology, 2004