The Albanese mapping for a punctual Hilbert scheme. I. Irreducibility of the fibers
HTML articles powered by AMS MathViewer
- by Mark E. Huibregtse PDF
- Trans. Amer. Math. Soc. 251 (1979), 267-285 Request permission
Abstract:
Let $f: X \to A$ be the canonical mapping from an algebraic surface X to its Albanese variety A, $X(n)$ the n-fold symmetric product of X, and $H_X^n$ the punctual Hilbert scheme parameterizing 0-dimensional closed subschemes of length n on X. The latter is a nonsingular and irreducible variety of dimension $2n$, and the “Hilbert-Chow” morphism ${\sigma _n}: H_X^n \to X(n)$ is a birational map which desingularizes $X(n)$. This paper studies the composite morphism \[ {\varphi _n}: H_X^n\xrightarrow {{{\sigma _n}}}X(n)\xrightarrow {{{f_n}}}A ,\] where ${f_n}$ is obtained from f by addition on A. The main result (Part 1 of the paper) is that for $n \gg 0$, all the fibers of ${\varphi _n}$ are irreducible and of dimension $2n - q$, where $q = \dim A$. An interesting special case (Part 2 of the paper) arises when $X = A$ is an abelian surface; in this case we show (for example) that the fibers of ${\varphi _n}$ are nonsingular, provided n is prime to the characteristic.References
-
A. Douady, Variétés abéliennes, Exposé 9 of Sém. C. Chevalley, Variétés de Picard, École Norm. Sup., 1958-59.
- John Fogarty, Algebraic families on an algebraic surface, Amer. J. Math. 90 (1968), 511–521. MR 237496, DOI 10.2307/2373541 A. Grothendieck, Sém. Bourbaki, Exposé 221, Paris, 1960.
- Revêtements étales et groupe fondamental, Lecture Notes in Mathematics, Vol. 224, Springer-Verlag, Berlin-New York, 1971 (French). Séminaire de Géométrie Algébrique du Bois Marie 1960–1961 (SGA 1); Dirigé par Alexandre Grothendieck. Augmenté de deux exposés de M. Raynaud. MR 0354651
- A. Iarrobino, Punctual Hilbert schemes, Bull. Amer. Math. Soc. 78 (1972), 819–823. MR 308120, DOI 10.1090/S0002-9904-1972-13049-0
- A. Iarrobino, Reducibility of the families of $0$-dimensional schemes on a variety, Invent. Math. 15 (1972), 72–77. MR 301010, DOI 10.1007/BF01418644
- Birger Iversen, Linear determinants with applications to the Picard scheme of a family of algebraic curves, Lecture Notes in Mathematics, Vol. 174, Springer-Verlag, Berlin-New York, 1970. MR 0292835, DOI 10.1007/BFb0069474
- Shoji Koizumi, On Albanese varieties, Illinois J. Math. 4 (1960), 358–366. MR 120231
- Serge Lang, Introduction to algebraic geometry, Interscience Publishers, Inc., New York-London, 1958. MR 0100591
- Arthur Mattuck, The irreducibility of the regular series on an algebraic variety, Illinois J. Math. 3 (1959), 145–149. MR 103192
- David Mumford, Abelian varieties, Tata Institute of Fundamental Research Studies in Mathematics, vol. 5, Published for the Tata Institute of Fundamental Research, Bombay by Oxford University Press, London, 1970. MR 0282985
- Jean-Pierre Serre, Groupes algébriques et corps de classes, Publications de l’Institut de Mathématique de l’Université de Nancago, VII, Hermann, Paris, 1959 (French). MR 0103191
- I. R. Shafarevich, Basic algebraic geometry, Die Grundlehren der mathematischen Wissenschaften, Band 213, Springer-Verlag, New York-Heidelberg, 1974. Translated from the Russian by K. A. Hirsch. MR 0366917, DOI 10.1007/978-3-642-96200-4
- E. Spanier, The homology of Kummer manifolds, Proc. Amer. Math. Soc. 7 (1956), 155–160. MR 87188, DOI 10.1090/S0002-9939-1956-0087188-3
Additional Information
- © Copyright 1979 American Mathematical Society
- Journal: Trans. Amer. Math. Soc. 251 (1979), 267-285
- MSC: Primary 14C05; Secondary 14E99, 14K99
- DOI: https://doi.org/10.1090/S0002-9947-1979-0531979-9
- MathSciNet review: 531979