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SPECIAL VALUES OF THE ZETA FUNCTION OF AN ARITHMETIC SURFACE

Published online by Cambridge University Press:  15 March 2021

Matthias Flach
Affiliation:
Dept. of Mathematics 253-37, California Institute of Technology, PasadenaCA91125 (flach@caltech.edu, daniel.siebel@yahoo.de)
Daniel Siebel
Affiliation:
Dept. of Mathematics 253-37, California Institute of Technology, PasadenaCA91125 (flach@caltech.edu, daniel.siebel@yahoo.de)
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Abstract

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We prove that the special-value conjecture for the zeta function of a proper, regular, flat arithmetic surface formulated in [6] at $s=1$ is equivalent to the Birch and Swinnerton-Dyer conjecture for the Jacobian of the generic fibre. There are two key results in the proof. The first is the triviality of the correction factor of [6, Conjecture 5.12], which we show for arbitrary regular proper arithmetic schemes. In the proof we need to develop some results for the eh-topology on schemes over finite fields which might be of independent interest. The second result is a different proof of a formula due to Geisser, relating the cardinalities of the Brauer and the Tate–Shafarevich group, which applies to arbitrary rather than only totally imaginary base fields.

Type
Research Article
Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
© The Author(s), 2021. Published by Cambridge University Press

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