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Threefolds fibred by mirror sextic double planes

Published online by Cambridge University Press:  24 June 2020

Remkes Kooistra
Affiliation:
The King’s University, 9125 – 50 St NW, Edmonton, AB T6B 2H3, Canada e-mail: [email protected]
Alan Thompson*
Affiliation:
Department of Mathematical Sciences, Loughborough University, Loughborough, Leicestershire LE11 3TU, United Kingdom

Abstract

We present a systematic study of threefolds fibred by K3 surfaces that are mirror to sextic double planes. There are many parallels between this theory and the theory of elliptic surfaces. We show that the geometry of such threefolds is controlled by a pair of invariants, called the generalized functional and generalized homological invariants, and we derive an explicit birational model for them, which we call the Weierstrass form. We then describe how to resolve the singularities of the Weierstrass form to obtain the “minimal form”, which has mild singularities and is unique up to birational maps in codimension 2. Finally, we describe some of the geometric properties of threefolds in minimal form, including their singular fibres, canonical divisor, and Betti numbers.

Type
Article
Copyright
© Canadian Mathematical Society 2020

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