Algebraic Geometry/Analytic Geometry
Unobstructed Lagrangian deformations
[Déformations lagrangiennes non-obstruées]
Comptes Rendus. Mathématique, Tome 338 (2004) no. 8, pp. 617-622.

On démontre que les déformations d'une singularité lagrangienne ne sont pas obstruées si le foncteur des déformations plates est lisse et si une condition d'annulation cohomologique est satisfaite. Ceci donne une autre application à la théorie des déformations du complexe de de Rham lagrangien introduit dans Sevenheck et van Straten (Math. Ann. 327 (1) (2003) 79–102). Le théorème est prouvé grâce à un critère de relèvement de déformations infinitésimales dû à Ran, Kawamata et d'autres.

We prove that deformations of a Lagrangian singularity are unobstructed if the usual (flat) deformations are unobstructed and if a cohomological vanishing condition is satisfied. This gives another application to deformation theory of the Lagrangian de Rham complex introduced in Sevenheck and van Straten (Math. Ann. 327 (1) (2003) 79–102). To prove our theorem, we use the T1-lifting criterion due to Ran, Kawamata and others.

Reçu le :
Accepté le :
Publié le :
DOI : 10.1016/j.crma.2004.02.006
Sevenheck, Christian 1

1 École normale supérieure, département de mathématiques et applications, 45, rue d'Ulm, 75230 Paris cedex 05, France
@article{CRMATH_2004__338_8_617_0,
     author = {Sevenheck, Christian},
     title = {Unobstructed {Lagrangian} deformations},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {617--622},
     publisher = {Elsevier},
     volume = {338},
     number = {8},
     year = {2004},
     doi = {10.1016/j.crma.2004.02.006},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.crma.2004.02.006/}
}
TY  - JOUR
AU  - Sevenheck, Christian
TI  - Unobstructed Lagrangian deformations
JO  - Comptes Rendus. Mathématique
PY  - 2004
SP  - 617
EP  - 622
VL  - 338
IS  - 8
PB  - Elsevier
UR  - http://www.numdam.org/articles/10.1016/j.crma.2004.02.006/
DO  - 10.1016/j.crma.2004.02.006
LA  - en
ID  - CRMATH_2004__338_8_617_0
ER  - 
%0 Journal Article
%A Sevenheck, Christian
%T Unobstructed Lagrangian deformations
%J Comptes Rendus. Mathématique
%D 2004
%P 617-622
%V 338
%N 8
%I Elsevier
%U http://www.numdam.org/articles/10.1016/j.crma.2004.02.006/
%R 10.1016/j.crma.2004.02.006
%G en
%F CRMATH_2004__338_8_617_0
Sevenheck, Christian. Unobstructed Lagrangian deformations. Comptes Rendus. Mathématique, Tome 338 (2004) no. 8, pp. 617-622. doi : 10.1016/j.crma.2004.02.006. http://www.numdam.org/articles/10.1016/j.crma.2004.02.006/

[1] Artin, M. Lectures on Deformations of Singularities. Notes by C.S. Seshadri, Allen Tannenbaum, Tata Inst. Fund. Res. Lectures on Math. and Phys., vol. 54, Tata Institute of Fundamental Research, Bombay, 1976

[2] Fantechi, B.; Manetti, M. Obstruction calculus for functors on Artin rings, I, J. Algebra, Volume 202 (1998), pp. 541-576

[3] Fantechi, B.; Manetti, M. On the T1-lifting theorem, J. Algebraic Geometry, Volume 8 (1999), pp. 31-39

[4] Garay, M. A rigidity theorem for Lagrangian deformations (Preprint, 2003) | arXiv

[5] Gross, M. Deforming Calabi–Yau threefolds, Math. Ann., Volume 308 (1997) no. 2, pp. 187-220

[6] Schlessinger, M. Functors of Artin rings, Trans. Amer. Math. Soc., Volume 130 (1968), pp. 208-222

[7] Ch. Sevenheck, Lagrangian singularities, Ph.D. thesis, Johannes-Gutenberg-Universität Mainz and École Polytechnique, Palaiseau, 2003, p. 177, available at http://www.dma.ens.fr/~sevenhec

[8] Sevenheck, Ch.; van Straten, D. Deformation of singular Lagrangian subvarieties, Math. Ann., Volume 327 (2003) no. 1, pp. 79-102

[9] Sevenheck, Ch.; van Straten, D. Rigid and complete intersection Lagrangian singularities (Preprint, 2003) | arXiv

[10] Voisin, C. Sur la stabilité des sous-variétés lagrangiennes des variétés symplectiques holomorphes, Complex Projective Geometry, London Math. Soc. Lecture Note Ser., vol. 179, 1992, pp. 294-303

Cité par Sources :