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On CR maps between hyperquadrics and Winkelmann hypersurfaces

Michael Reiter

https://orcid.org/0000-0001-9809-5578

Fakultät für Mathematik, Universität Wien, Oskar-Morgenstern-Platz 1, 1090 Wien, Austria

E-mail Address: m.reiter@univie.ac.at

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and

Duong Ngoc Son

https://orcid.org/0000-0002-8437-8056

Faculty of Fundamental Sciences, Phenikaa University, Hanoi 12116, Vietnam

E-mail Address: son.duongngoc@phenikaa-uni.edu.vn

Corresponding author.

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https://doi.org/10.1142/S0129167X24500496Cited by:0 (Source: Crossref)

Abstract

In this paper, we study CR maps between hyperquadrics and Winkelmann hypersurfaces. Based on a previous study on the CR Ahlfors derivative of Lamel–Son and a recent result of Huang–Lu–Tang–Xiao on CR maps between hyperquadrics, we prove that a transversal CR map from a hyperquadric into a hyperquadric or a Winkelmann hypersurface extends to a local holomorphic isometric embedding with respect to certain Kähler metrics if and only if the Hermitian part of its CR Ahlfors derivative vanishes on an open set of the source. Our proof is based on relating the geometric rank of a CR map into a hyperquadric and its CR Ahlfors derivative.

Communicated by Franc Forstneric

Keywords:

AMSC: 32H35, 32V40, 53A40

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