Title Geometric invariant theory for polarized curves / Gilberto Bini, Fabio Felici, Margarida Melo, Filippo Viviani

Published Cham [Switzerland] : Springer, [2014]

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Description 1 online resource (x, 211 pages) : illustrations Series Lecture notes in mathematics, 1617-9692 ; 2122 Lecture notes in mathematics (Springer-Verlag) ; 2122. Contents Introduction -- Singular Curves -- Combinatorial Results -- Preliminaries on GIT -- Potential Pseudo-stability Theorem -- Stabilizer Subgroups -- Behavior at the Extremes of the Basic Inequality -- A Criterion of Stability for Tails -- Elliptic Tails and Tacnodes with a Line -- A Strati_cation of the Semistable Locus -- Semistable, Polystable and Stable Points (part I) -- Stability of Elliptic Tails -- Semistable, Polystable and Stable Points (part II) -- Geometric Properties of the GIT Quotient -- Extra Components of the GIT Quotient -- Compacti_cations of the Universal Jacobian -- Appendix: Positivity Properties of Balanced Line Bundles Summary We investigate GIT quotients of polarized curves. More specifically, we study the GIT problem for the Hilbert and Chow schemes of curves of degree d and genus g in a projective space of dimension d-g, as d decreases with respect to g. We prove that the first three values of d at which the GIT quotients change are given by d=a(2g-2) where a=2, 3.5, 4. We show that, for a>4, L. Caporaso's results hold true for both Hilbert and Chow semistability. If 3.5<a<4, the Hilbert semistable locus coincides with the Chow semistable locus and it maps to the moduli stack of weakly-pseudo-stable curves. If 2<a<3.5, the Hilbert and Chow semistable loci coincide and they map to the moduli stack of pseudo-stable curves. We also analyze in detail the critical values a=3.5 and a=4, where the Hilbert semistable locus is strictly smaller than the Chow semistable locus. As an application, we obtain three compactications of the universal Jacobian over the moduli space of stable curves, weakly-pseudo-stable curves and pseudo-stable curves, respectively Bibliography Includes bibliographical references and index Notes English Online resource; title from PDF title page (SpringerLink, viewed November 12, 2014) Subject Geometry, Algebraic. Invariants. Moduli theory. Geometry, Algebraic Invariants Moduli theory Form Electronic book Author Felici, Fabio (Mathematician), author. Melo, Margarida (Mathematician), author. Viviani, Filippo, author ISBN 9783319113371 3319113372

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