Skip to Main Content
Journal of Algebraic Geometry

Journal of Algebraic Geometry

Online ISSN 1534-7486; Print ISSN 1056-3911



Regularity on abelian varieties II: Basic results on linear series and defining equations

Authors: Giuseppe Pareschi and Mihnea Popa
Journal: J. Algebraic Geom. 13 (2004), 167-193
Published electronically: August 21, 2003
MathSciNet review: 2008719
Full-text PDF

Abstract | References | Additional Information

Abstract: We apply the theory of $M$-regularity developed by the authors [Regularity on abelian varieties, I, J. Amer. Math. Soc. 16 (2003), 285–302] to the study of linear series given by multiples of ample line bundles on abelian varieties. We define an invariant of a line bundle, called $M$-regularity index, which governs the higher order properties and (partly conjecturally) the defining equations of such embeddings. We prove a general result on the behavior of the defining equations and higher syzygies in embeddings given by multiples of ample bundles whose base locus has no fixed components, extending a conjecture of Lazarsfeld [proved in Syzygies of abelian varieties, J. Amer. Math. Soc. 13 (2000), 651–664]. This approach also unifies essentially all the previously known results in this area, and is based on Fourier-Mukai techniques rather than representations of theta groups.

References [Enhancements On Off] (What's this?)

    [BSz]bauer T. Bauer and T. Szemberg, Higher order embeddings of abelian varieties, Math. Z. 224 (1997), 449–455. [BS]sommese M. Beltrametti and A. Sommese, On $k$-jet ampleness, in Complex analysis and geometry, V. Ancona and A. Silva, eds., Plenum Press (1993), 355–376. [BLvS]blvs C. Birkenhake, H. Lange and D. van Straten, Abelian surfaces of type $(1,4)$, Math. Ann. 285 (1989), 625–646. [Gr]green M. Green, Koszul cohomology and the geometry of projective varieties, I, J. Diff. Geom. 19 (1984), 125–171. [GL]gl M. Green and R. Lazarsfeld, On the projective normality of complete linear series on an algebraic curve, Invent. Math. 83 (1985), 73–90. [Kh]khaled A. Khaled, Equations definissant des varietes abeliennes, C.R. Acad. Sci. Paris, Ser. I Math 315 (1992) 571–576. [Ke1]kempf1 G. Kempf, Linear systems on abelian varieties, Am. J. Math. 111 (1989), 65–94. [Ke2]kempf2 G. Kempf, Projective coordinate rings of abelian varieties, in Algebraic analysis, geometry and number theory, J.I. Igusa ed., Johns Hopkins Press (1989), 225–236. [Ke3]kempf3 G. Kempf, Complex Abelian Varieties and Theta Functions, Springer-Verlag, 1991. [Ko]koizumi S. Koizumi, Theta relations and projective normality of abelian varieties, Am. J. Math. 98 (1976), 865–889. [LB]lange H. Lange and C. Birkenhake, Complex abelian varieties, Springer-Verlag, 1992. [La1]lazarsfeld R. Lazarsfeld, A sampling of vector bundles techniques in the study of linear series, in Lectures on Riemann surfaces (Cornalba, Gomez-Mont, Verjovsky, eds.), 500-559, World Scientific, 1989. [La2]lazarsfeld2 R. Lazarsfeld, Lengths of periods and Seshadri constants of abelian varieties, Math. Res. Lett. 3 (1996), 439–447. [Mu]mukai S. Mukai, Duality between $D(X)$ and $D(\hat {X})$ with its application to Picard sheaves, Nagoya Math. J. 81 (1981), 153–175. [M1]mumford D. Mumford, Abelian varieties, Second edition, Oxford Univ. Press, 1974. [M2]mumford1 D. Mumford, On the equations defining abelian varieties, Invent. Math. 1 (1966), 287–354. [M3]mumford2 D. Mumford, Varieties defined by quadratic equations, in Questions on algebraic varieties, 31–100, Cremonese, Roma, 1970. [Oh1]ohbuchi1 A. Ohbuchi, Some remarks on simple line bundles on abelian varieties, Manuscripta Math. 57 (1987), 225–238. [Oh2]ohbuchi2 A. Ohbuchi, A note on the normal generation of ample line bundles on abelian varieties, Proc. Japan Acad. 64 (1988), 119–120. [Pa]pareschi G. Pareschi, Syzygies of abelian varieties, J. Amer. Math. Soc. 13 (2000), 651–664. [PP]us G. Pareschi and M. Popa, Regularity on abelian varieties, I, J. Amer. Math. Soc. 16 (2003), 285–302. [Se]Sekiguchi T. Sekiguchi, On the normal generation by a line bundle on an abelian variety, Proc. Japan Acad. 54 (1978), 185–188.

Additional Information

Giuseppe Pareschi
Affiliation: Dipartamento di Matematica, Università di Roma, Tor Vergata, V.le della Ricerca Scientifica, I-00133 Roma, Italy

Mihnea Popa
Affiliation: Department of Mathematics, Harvard University, One Oxford Street, Cambridge, Massachusetts 02138
MR Author ID: 653676

Received by editor(s): October 21, 2001
Published electronically: August 21, 2003
Additional Notes: The second author was partially supported by a Clay Mathematics Institute Liftoff Fellowship during the preparation of this paper.