Real-fibered morphisms of del Pezzo surfaces and conic bundles

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

Abstract

It goes back to Ahlfors that a real algebraic curve admits a real-fibered morphism to the projective line if and only if the real part of the curve disconnects its complex part. Inspired by this result, we are interested in characterising real algebraic varieties of dimension n admitting real-fibered morphisms to the n-dimensional projective space. We present a criterion to classify real-fibered morphisms that arise as finite surjective linear projections from an embedded variety which relies on topological linking numbers. We address special attention to real algebraic surfaces. We classify all real-fibered morphisms from real del Pezzo surfaces to the projective plane and determine which such morphisms arise as the composition of a projective embedding with a linear projection. Furthermore, we give some insights in the case of real conic bundles.

Details

Original languageEnglish
Pages (from-to)849-872
Number of pages24
Journal Discrete & computational geometry : an international journal of mathematics and computer science
Volume69
Issue number3
Early online date24 Nov 2022
Publication statusPublished - Apr 2023
Peer-reviewedYes

External IDs

Scopus 85142489738

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