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http://doi.org/10.25358/openscience-9985
Autoren: | Buhr, Lukas |
Hauptberichter: | Lehn, Manfred van Straten, Duco |
Titel: | Quotients for non-reductive group actions and applications to moduli spaces of matrix factorisations |
Online-Publikationsdatum: | 15-Feb-2024 |
Erscheinungsdatum: | 2024 |
Sprache des Dokuments: | Englisch |
Zusammenfassung/Abstract: | Classical geometric invariant theory as developed by D. Mumford in his book "Geometric Invariant Theory" only applies to actions of a reductive group. G. Bérczi, B. Doran, T. Hawes, and F. Kirwan construct in "Projective Completions of graded unipotent quotients" quotients for non-reductive group actions on projective and irreducible schemes under the assumption that the unipotent radical admits a positive grading. In the first part of this thesis, we study actions of a non-reductive group G on a separated scheme X of finite type over the base field. We formulate a definition for semi-stable and stable points with respect to a pair (K,L) of two G-linearisations and a chosen Levi-factor of G. If the line bundle K is ample, then the locus of semi-stable points admits a good quotient which contains a geometric quotient of the locus of stable points as an open subset. We give a sufficient condition such that the good quotient of the locus of semi-stable points is projective. Further, we prove a Hilbert-Mumford-style criterion to compute the set of semi-stable points. This generalises results by G. Bérczi, B. Doran, T. Hawes and F. Kirwan. In the second part of this thesis, we apply the results of non-reductive geometric invariant theory to construct compactifications of moduli spaces of matrix factorisations of Shamash type. We examine two cases in particular. Let an elliptic quintic curve or a twisted quartic curve be contained in a cubic threefold which is cut out by a homogeneous form f of degree three. We obtain a matrix factorisation of f from the minimal resolution of the homogeneous coordinate ring of the curve over the homogeneous coordinate ring of the ambient projective space with a construction by J. Shamash. For both types of matrix factorisations, we give sufficient numerical conditions on the chosen linearisations (K,L) such that the good quotient of semi-stable generalised matrix factorisations by the action of the automorphism group is projective. This quotient contains a geometric quotient of the locus of stable matrix factorisations as an open subset. |
DDC-Sachgruppe: | 510 Mathematik 510 Mathematics |
Veröffentlichende Institution: | Johannes Gutenberg-Universität Mainz |
Organisationseinheit: | FB 08 Physik, Mathematik u. Informatik |
Veröffentlichungsort: | Mainz |
ROR: | https://ror.org/023b0x485 |
DOI: | http://doi.org/10.25358/openscience-9985 |
URN: | urn:nbn:de:hebis:77-openscience-24eb48c4-9385-4805-858a-1f96686fa4c77 |
Version: | Original work |
Publikationstyp: | Dissertation |
Nutzungsrechte: | Urheberrechtsschutz |
Informationen zu den Nutzungsrechten: | http://rightsstatements.org/vocab/InC/1.0/ |
Umfang: | xiii, 81 Seiten |
Enthalten in den Sammlungen: | JGU-Publikationen |
Dateien zu dieser Ressource:
Datei | Beschreibung | Größe | Format | ||
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quotients_for_nonreductive_gr-20240125141033764.pdf | 506.47 kB | Adobe PDF | Öffnen/Anzeigen |