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Orbifold hyperbolicity

Published online by Cambridge University Press:  08 October 2020

Frédéric Campana
Affiliation:
Institut de Mathématiques Élie Cartan, Université de Lorraine, B.P. 70239, 54506 Vandœuvre-lés-Nancy Cedex, France frederic.campana@univ-lorraine.fr KIAS, 85 Hoegiro, Dongdaemungu, Seoul 130-722, South Korea
Lionel Darondeau
Affiliation:
KU Leuven, Departement Wiskunde, Celestijnenlaan 200B, 3001 Heverlee, België Current address: IMAG, Univ. Montpellier, CNRS, Montpellier, France lionel.darondeau@normalesup.org
Erwan Rousseau
Affiliation:
Institut Universitaire de France & Aix Marseille Univ., CNRS, Centrale Marseille, I2M, Marseille, France erwan.rousseau@univ-amu.fr

Abstract

We define and study jet bundles in the geometric orbifold category. We show that the usual arguments from the compact and the logarithmic settings do not all extend to this more general framework. This is illustrated by simple examples of orbifold pairs of general type that do not admit any global jet differential, even if some of these examples satisfy the Green–Griffiths–Lang conjecture. This contrasts with an important result of Demailly (Holomorphic Morse inequalities and the Green-Griffiths-Lang conjecture, Pure Appl. Math. Q. 7 (2011), 1165–1207) proving that compact varieties of general type always admit jet differentials. We illustrate the usefulness of the study of orbifold jets by establishing the hyperbolicity of some orbifold surfaces, that cannot be derived from the current techniques in Nevanlinna theory. We also conjecture that Demailly's theorem should hold for orbifold pairs with smooth boundary divisors under a certain natural multiplicity condition, and provide some evidence towards it.

Information

Type
Research Article
Copyright
Copyright © The Author(s) 2020

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