no. 6
Curvature restrictions for Levi-flat real hypersurfaces in complex projective planes
Adachi, Masanori1, 2; Brinkschulte, Judith3
1 Nagoya University, Graduate School of Mathematics, Nagoya 464-8602 (Japan)
2 Pohang University of Science and Technology, Center for Geometry and its Applications, Pohang 790-784 (Republic of Korea)
3 Universität Leipzig, Mathematisches Institut, PF 100920, D-04009 Leipzig (Germany)
Annales de l'Institut Fourier, Volume 65 (2015) no. 6, pp. 2547-2569.

We study curvature restrictions of Levi-flat real hypersurfaces in complex projective planes, whose existence is in question. We focus on its totally real Ricci curvature, the Ricci curvature of the real hypersurface in the direction of the Reeb vector field, and show that it cannot be greater than -4 along a Levi-flat real hypersurface. We rely on a finiteness theorem for the space of square integrable holomorphic 2-forms on the complement of the Levi-flat real hypersurface, where the curvature plays the role of the size of the infinitesimal holonomy of its Levi foliation.

Nous étudions des restrictions sur une courbure des hypersurfaces réelles Levi-plates dans des plans projectifs complexes, dont l’existence est en question. Nous nous focalisons sur sa courbure de Ricci totalement réelle, c’est-â-dire la courbure de Ricci de l’hypersurface réelle dans la direction du champ de Reeb, et nous démontrons qu’elle ne peut pas être supérieure à -4 le long de l’hypersurface réelle Levi-plate. Nous nous appuyons sur un théorème de finitude pour l’espace des 2-formes holomorphes de carrés intégrables sur le complément de l’hypersurface réelle Levi-plate, où la courbure joue le rôle de la taille de l’holonomie infinitésimale de son feuilletage de Levi.

DOI: 10.5802/aif.2995
Classification: 32V15, 32V40, 53B25, 53C12
Keywords: Levi-flat real hypersurface, totally real Ricci curvature, adjunction formula, integral formula
Adachi, Masanori 1, 2; Brinkschulte, Judith 3

1 Nagoya University, Graduate School of Mathematics, Nagoya 464-8602 (Japan)
2 Pohang University of Science and Technology, Center for Geometry and its Applications, Pohang 790-784 (Republic of Korea)
3 Universität Leipzig, Mathematisches Institut, PF 100920, D-04009 Leipzig (Germany) 
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Adachi, Masanori; Brinkschulte, Judith. Curvature restrictions for Levi-flat real hypersurfaces in complex projective planes. Annales de l'Institut Fourier, Volume 65 (2015) no. 6, pp. 2547-2569. doi : 10.5802/aif.2995. https://aif.centre-mersenne.org/articles/10.5802/aif.2995/

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