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Optimal Quotients of Jacobians With ToricReduction and Component Groups

Published online by Cambridge University Press:  20 November 2018

Mihran Papikian  and
Joseph Rabinoff
Mihran Papikian
Affiliation:
Department of Mathematics, Pennsylvania State University, University Park, PA 16802, USA e-mail: [email protected]
Joseph Rabinoff
Affiliation:
School of Mathematics, Georgia Institute of Technology, 686 Cherry Street, Atlanta, GA 30332 e-mail: [email protected]
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Abstract

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Let $J$ be a Jacobian variety with toric reduction over a local field $K$. Let $J\,\to \,E$ be an optimal quotient defined over $K$, where $E$ is an elliptic curve. We give examples in which the functorially induced map ${{\Phi }_{J}}\,\to \,{{\Phi }_{E}}$ on component groups of the Néron models is not surjective. This answers a question of Ribet and Takahashi. We also give various criteria under which ${{\Phi }_{J}}\,\to \,{{\Phi }_{E}}$ is surjective and discuss when these criteria hold for the Jacobians of modular curves.

Keywords

11G1814G2214G20Jacobians with toric reductioncomponent groupsmodular curves
Type
Research Article
Information
Canadian Journal of Mathematics , Volume 68 , Issue 6 , 01 December 2016 , pp. 1362 - 1381
Copyright
Copyright © Canadian Mathematical Society 2016

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