The classification of holomorphic $(m,n)$--subharmonic morphisms

TL;DR

This paper classifies holomorphic $(m,n)$-subharmonic morphisms in complex space, identifying when such mappings preserve subharmonicity and describing three main scenarios based on dimensions and models.

Contribution

It provides a comprehensive classification of holomorphic $(m,n)$-subharmonic morphisms, revealing three distinct cases and their structural forms.

Findings

Holomorphic mappings are either constant, orthogonal projections, or gain subharmonicity in the Caffarelli-Nirenberg-Spruck sense.

Three scenarios depend on dimensions and models, determining the form of subharmonic morphisms.

The classification clarifies the structure of subharmonicity-preserving holomorphic maps.

Abstract

We study the problem of classifying the holomorphic $(m,n)$-subharmonic morphisms in complex space. This determines which holomorphic mappings preserves $m$-subharmonicity in the sense that the composition of the holomorphic mapping with a $m$-subharmonic functions is $n$-subharmonic. We show that there are three different scenarios depending on the underlying dimensions, and the model itself. Either the holomorphic mappings are just the constant functions, or up to composition with a homotethetic map, canonical orthogonal projections. Finally, there is a more intriguing case when subharmonicity is gained in the sense of the Caffarelli-Nirenberg-Spruck framework.