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On birationally trivial families and adjoint quadrics

Published online by Cambridge University Press:  04 July 2022

Luca Cesarano
Affiliation:
Mathematisches Institut, Universität Bayreuth, Universitätsstraße 30, 95447 Bayreuth, Germany ([email protected])
Luca Rizzi
Affiliation:
IBS Center for Complex Geometry, 55 EXPO-ro, Yuseong-gu, 34126 Daejeon, South Korea ([email protected])
Francesco Zucconi
Affiliation:
DMIF, Università di Udine, Via delle Scienze 206, 33100 Udine, Italy ([email protected])

Abstract

Let $\pi \colon \mathcal {X}\to B$ be a family whose general fibre $X_b$ is a $(d_1,\,\ldots,\,d_a)$-polarization on a general abelian variety, where $1\leq d_i\leq 2$, $i=1,\,\ldots,\,a$ and $a\geq 4$. We show that the fibres are in the same birational class if all the $(m,\,0)$-forms on $X_b$ are liftable to $(m,\,0)$-forms on $\mathcal {X}$, where $m=1$ and $m=a-1$. Actually, we show a general criteria to establish whether the fibres of certain families belong to the same birational class.

Type
Research Article
Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press on Behalf of The Edinburgh Mathematical Society

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