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Néron models and limits of Abel–Jacobi mappings

Published online by Cambridge University Press:  02 February 2010

Mark Green
Affiliation:
Department of Mathematics, University of California at Los Angeles, Los Angeles, CA 90095, USA (email: mlg@ipam.ucla.edu)
Phillip Griffiths
Affiliation:
Institute for Advanced Study, Einstein Drive, Princeton, NJ 08540, USA (email: pg@ias.edu)
Matt Kerr
Affiliation:
Department of Mathematical Sciences, University of Durham, Science Laboratories, South Road/Durham DH1 3LE, UK (email: matthew.kerr@durham.ac.uk)
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Abstract

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We show that the limit of a one-parameter admissible normal function with no singularities lies in a non-classical sub-object of the limiting intermediate Jacobian. Using this, we construct a Hausdorff slit analytic space, with complex Lie group fibres, which ‘graphs’ such normal functions. For singular normal functions, an extension of the sub-object by a finite group leads to the Néron models. When the normal function comes from geometry, that is, a family of algebraic cycles on a semistably degenerating family of varieties, its limit may be interpreted via the Abel–Jacobi map on motivic cohomology of the singular fibre, hence via regulators on K-groups of its substrata. Two examples are worked out in detail, for families of 1-cycles on CY and abelian 3-folds, where this produces interesting arithmetic constraints on such limits. We also show how to compute the finite ‘singularity group’ in the geometric setting.

Information

Type
Research Article
Copyright
Copyright © Foundation Compositio Mathematica 2010