A GIT construction of degenerations of Hilbert schemes of points

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  • Martin G. Gulbrandsen
  • Lars Halvard Halle
  • Klaus Hulek
We present a Geometric Invariant Theory (GIT) construction which allows us to construct good projective degenerations of Hilbert schemes of points for simple degenerations. A comparison with the construction of Li and Wu shows that our GIT stack and the stack they construct are isomorphic, as are the associated coarse moduli schemes. Our construction is sufficiently explicit to obtain good control over the geometry of the singular fibres. We illustrate this by giving a concrete description of degenerations of degree Hilbert schemes of a simple degeneration with two components.
Original languageEnglish
JournalDocumenta Mathematica
Volume24
Pages (from-to)421-472
Number of pages52
ISSN1431-0635
DOIs
Publication statusPublished - 2019

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