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Compactifying locally Cohen-Macaulay projective curves
KTH, School of Engineering Sciences (SCI), Mathematics (Dept.).
2005 (English)Doctoral thesis, monograph (Other scientific)
Abstract [en]

We define a moduli functor parametrizing finite maps from a projective (locally) Cohen-Macaulay curve to a fixed projective space. The definition of the functor includes a number of technical conditions, but the most important is that the map is almost everywhere an isomorphism onto its image. The motivation for this definition comes from trying to interpolate between the Hilbert scheme and the Kontsevich mapping space. The main result is that our functor is represented by a proper algebraic space. As applications we obtain a new proof of the existence of Macaulayfications for varieties, and secondly, interesting compactifications of the spaces of smooth curves in projective space. We illustrate this in the case of rational quartics, where the resulting space appears easier than the Hilbert scheme.

Place, publisher, year, edition, pages
Stockholm: KTH , 2005. , 34 p.
Trita-MAT. MA, ISSN 1401-2278 ; 05-12
Keyword [en]
Cohen-Macaulay compactification, curves, algebraic space
National Category
URN: urn:nbn:se:kth:diva-470ISBN: 91-7178-193-5OAI: diva2:13507
Public defence
2005-11-18, F3, Lindstedsv. 26, KTH, 15:00
QC 20101022Available from: 2005-11-02 Created: 2005-11-02 Last updated: 2010-10-22Bibliographically approved

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