The Classification of Hyperelliptic Groups in Dimension 4

Erscheinungsjahr 2026
ISBN: 978-3-032-24625-7
Verlag: Springer Nature Switzerland AG

Buch, Englisch, 237 Seiten, Format (B × H): 155 mm x 235 mm

Reihe: Lecture Notes of the Unione Matematica Italiana

This book explores the geometry of hyperelliptic manifolds, a higher-dimensional generalization of classical hyperelliptic surfaces. Hyperelliptic surfaces, historically classified by Enriques, Severi, and Bagnera-de Franchis, are compact complex surfaces with Kodaira dimension zero, geometric genus zero, and irregularity one. Moreover, their canonical divisor K is torsion: indeed, 12K is trivial. This monograph extends these ideas to complex tori of arbitrary dimension, quotienting complex tori by finite groups acting freely and without translations. Focusing on the classification of hyperelliptic manifolds, the book presents new results in dimension four, completing a key step that had remained largely unexplored. Using methods from group theory, representation theory, and computer algebra, it identifies all finite groups that admit free and translation-free actions on four-dimensional complex tori. The work also investigates the torsion order of the canonical divisor for hyperelliptic manifolds in dimension at most five. The text includes detailed proofs, some of which are complemented by the computer algebra system GAP. The book also highlights connections with related topics such as Iitaka’s conjecture, and complex Bieberbach groups, situating hyperelliptic manifolds within broader contexts in algebraic geometry.

Designed for researchers interested in group actions on complex tori, this monograph provides both a comprehensive reference and a roadmap for further exploration. By combining classical theory with modern computational methods, it offers new insights into the structure and classification of higher-dimensional hyperelliptic manifolds.

Zielgruppe

Research

Autoren/Hrsg.

Demleitner, Andreas

Fachgebiete

• Mathematik | Informatik Mathematik Geometrie
• Mathematik | Informatik Mathematik Algebra Algebraische Strukturen, Gruppentheorie
• Mathematik | Informatik Mathematik Mathematik Allgemein

Inhaltsverzeichnis

Chapter 1. Introduction.- Chapter 2. A Short Group-Theoretic Account.- Chapter 3. Prerequisites on Complex Tori and Hyperelliptic Manifolds.- Chapter 4. Group-Theoretical Properties of Hyperelliptic Groups.- Chapter 5. Outline of the Classification.- Chapter 6. Abelian Hyperelliptic Groups.- Chapter 7. The 2-Sylow Subgroups of Hyperelliptic Groups in Dimension 4.- Chapter 8. The 3-Sylow Subgroups of Hyperelliptic Groups in Dimension 4.- Chapter 9. An Alternative Way of Determining the 2- and 3-Sylow Subgroups.- Chapter 10. Hyperelliptic Groups in Dimension 4 whose Order is 2?·3?.- Chapter 11. Hyperelliptic Groups in Dimension 4 whose Order is Divisible by 5 or 7.- Chapter 12. The Canonical Divisor of a Hyperelliptic Manifold.- Chapter 13. Final Remarks and Further Questions.

Über Autor(innen)

Andreas Demleitner is a mathematician whose research focuses on complex algebraic geometry, with a particular emphasis on the geometry of torus quotients and their moduli. He completed his Ph.D. at the University of Bayreuth in 2020 under the supervision of Prof. Dr. Fabrizio Catanese, working on the structure and classification of complex varieties. Afterwards, he held a postdoctoral position at the University of Freiburg with Prof. Dr. Stefan Kebekus, further developing his research on quotients of complex tori. His work contributes to a deeper understanding of the relationships between complex structures, group actions, and moduli spaces in algebraic geometry. In addition to research, Dr. Demleitner greatly enjoys teaching and sharing mathematical ideas. He has actively participated in academic collaborations and international conferences, engaging with the broader mathematical community and fostering the exchange of ideas across diverse areas of geometry.