• Title Quasi-projective Moduli for Polarized Manifolds
• Author(s) Eckart Viehweg
• Publisher: Springer; Softcover reprint of the original 1st ed. 1995 edition (December 27, 2011)
• Permission: "We cordially thank Springer-Verlag for their permission to make this book available on the web. The page layout is slightly different from the printed version."
• Paperback 320 pages
• eBook PDF (326 pages, 1.5 MB), PostScript, DVI, and TeX
• Language: English
• ISBN-10: 3642797474
• ISBN-13: 978-3642797477
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Book Description

This book discusses two subjects of quite different nature: Construction methods for quotients of quasi-projective schemes by group actions or by equivalence relations and properties of direct images of certain sheaves under smooth morphisms. Both methods together allow to prove the central result of the text, the existence of quasi-projective moduli schemes, whose points parametrize the set of manifolds with ample canonical divisors or the set of polarized manifolds with a semi-ample canonical divisor.

The concept of moduli goes back to B. Riemann, who shows in [68] that the isomorphism class of a Riemann surface of genus 9 ~ 2 depends on 3g - 3 parameters, which he proposes to name "moduli". A precise formulation of global moduli problems in algebraic geometry, the definition of moduli schemes or of algebraic moduli spaces for curves and for certain higher dimensional manifolds have only been given recently (A. Grothendieck, D. Mumford, see [59]), as well as solutions in some cases. It is the aim of this monograph to present methods which allow over a field of characteristic zero to construct certain moduli schemes together with an ample sheaf. Our main source of inspiration is D. Mumford's "Geometric Invariant Theory".

We will recall the necessary tools from his book and prove the "Hilbert-Mumford Criterion" and some modified version for the stability of points under group actions. A careful study of positivity properties of direct image sheaves allows to use this criterion to construct moduli as quasi-projective schemes for canonically polarized manifolds and for polarized manifolds with a semi-ample canonical sheaf.

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