Complex multiplication of abelian surfaces

Leiden Repository

Complex multiplication of abelian surfaces

Type: Doctoral Thesis
Title: Complex multiplication of abelian surfaces
Author: Streng, Theodorus Cornelis
Publisher: Mathematical Institute, Faculty of Science, Leiden University
Issue Date: 2010-06-01
Keywords: Abelian surface
Abelian variety
Class field
Class polynomial
Complex multiplication
Embedding degree
Finite field
Number theory
Abstract: The theory of complex multiplication makes it possible to construct certain class fields and abelian varieties. The main theme of this thesis is making these constructions explicit for the case where the abelian varieties have dimension 2. Chapter I is an introduction to complex multiplication, and shows that a general result of Shimura can be improved for degree-4 CM-fields. Chapter II gives an algorithm for computing class polynomials for quartic CM-fields, based on an algorithm of Spallek. We make the algorithm more explicit, and use Goren and Lauter’s recent bounds on the denominators of the coefficients, which yields the first running time bound and proof of correctness of an algorithm computing these polynomials. Chapter III studies and computes the irreducible components of the modular variety of abelian surfaces with CM by a given primitive quartic CM-field. We adapt the algorithm of Chapter II to compute these components. Chapters IV and V construct certain `Weil numbers'. They have properties that are number theoretic in nature and are motivated by cryptography. Chapter IV is joint work with David Freeman and Peter Stevenhagen. Chapter V is joint work with Laura Hitt O'Connor, Gary McGuire, and Michael Naehrig.
Description: Promotor: Peter Stevenhagen
With summary in Dutch
Faculty: Faculteit der Wiskunde en Natuurwetenschappen
Citation: Streng, T.C., 2010, Doctoral thesis, Leiden University
ISBN: 9789053352915

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