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Deformation of canonical morphisms and the moduli of surfaces of general type

Gallego Rodrigo, Francisco Javier and González Andrés, Miguel and Purnaprajna, Bangere P. (2010) Deformation of canonical morphisms and the moduli of surfaces of general type. Inventiones Mathematicae, 182 (1). pp. 1-46. ISSN 1432-1297

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Official URL: http://link.springer.de/link/service/journals/00222/

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Abstract

In this article we study the deformation of finite maps and show how to use this deformation theory to construct varieties with given invariants in a projective space. Among other things, we prove a criterion that determines when a finite map can be deformed to a one-to-one map. We use this criterion to construct new surfaces of general type with birational canonical map, for different c21 and _ (the canonical map of the surfaces we construct is in fact a finite, birational morphism). Our general results enable us to describe some new components of the moduli of surfaces of general type. We also find infinitely many moduli spaces M(x0,0,y) having one component whose general point corresponds to a canonically embedded surface and another component whose general point corresponds to a surface whose canonical map is a degree 2 morphism.


Item Type:Article
Uncontrolled Keywords:Algebraic-surfaces; Rational surfaces; Linear-systems; Embeddings; Degenerations; Conjecture; Varieties; Ribbons; Points; Curves
Subjects:Sciences > Mathematics > Algebraic geometry
ID Code:12682
Deposited On:06 May 2011 09:03
Last Modified:06 Feb 2014 09:30

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