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Relative Fourier–Mukai transforms for Weierstraß fibrations, abelian schemes and Fano fibrations

Published online by Cambridge University Press:  27 February 2013

ANA CRISTINA LÓPEZ MARTÍN ,
DARÍO SÁNCHEZ GÓMEZ  and
CARLOS TEJERO PRIETO
ANA CRISTINA LÓPEZ MARTÍN
Affiliation:
Departamento de Matemáticas and Instituto Universitario de Física Fundamental y Matemáticas (IUFFyM), Universidad de Salamanca, Plaza de la Merced 1–4, 37008 Salamanca, Spain. e-mail: [email protected], [email protected], [email protected]
DARÍO SÁNCHEZ GÓMEZ
Affiliation:
Departamento de Matemáticas and Instituto Universitario de Física Fundamental y Matemáticas (IUFFyM), Universidad de Salamanca, Plaza de la Merced 1–4, 37008 Salamanca, Spain. e-mail: [email protected], [email protected], [email protected]
CARLOS TEJERO PRIETO
Affiliation:
Departamento de Matemáticas and Instituto Universitario de Física Fundamental y Matemáticas (IUFFyM), Universidad de Salamanca, Plaza de la Merced 1–4, 37008 Salamanca, Spain. e-mail: [email protected], [email protected], [email protected]
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Abstract

We study the group of relative Fourier–Mukai transforms for Weierstraß fibrations, abelian schemes and Fano or anti-Fano fibrations. For Weierstraß and Fano or anti-Fano fibrations we describe this group completely. For abelian schemes over an arbitrary base we prove that if two of them are relative Fourier–Mukai partners then there is an isometric isomorphism between the fibre products of each of them and its dual abelian scheme. If the base is normal and the slope map is surjective we show that these two conditions are equivalent. Moreover in this situation we completely determine the group of relative Fourier–Mukai transforms and we prove that the number of relative Fourier–Mukai partners of a given abelian scheme over a normal base is finite.

Type
Research Article
Information
Mathematical Proceedings of the Cambridge Philosophical Society , Volume 155 , Issue 1 , July 2013 , pp. 129 - 153
Copyright
Copyright © Cambridge Philosophical Society 2013 

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