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A
tropical approach to nonarchimedean Arakelov geometry
Walter Gubler and Klaus Künnemann |
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Vol. 11 (2017), No. 1, 77–180
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Abstract |
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Chambert-Loir and Ducros have recently introduced a theory of real valued differential forms and currents on Berkovich spaces. In analogy to the theory of forms with logarithmic singularities, we enlarge the space of differential forms by so called -forms on the nonarchimedean analytification of an algebraic variety. This extension is based on an intersection theory for tropical cycles with smooth weights. We prove a generalization of the Poincaré–Lelong formula which allows us to represent the first Chern current of a formally metrized line bundle by a -form. We introduce the associated Monge–Ampère measure as a wedge-power of this first Chern -form and we show that is equal to the corresponding Chambert-Loir measure. The -product of Green currents is a crucial ingredient in the construction of the arithmetic intersection product. Using the formalism of -forms, we obtain a nonarchimedean analogue at least in the case of divisors. We use it to compute nonarchimedean local heights of proper varieties. |
Keywords
differential forms on Berkovich spaces, Chambert-Loir
measures, tropical intersection theory, nonarchimedean
Arakelov theory
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Mathematical Subject Classification 2010
Primary: 14G40
Secondary: 14G22, 14T05, 32P05
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Milestones
Received: 19 October 2015
Revised: 13 September 2016
Accepted: 13 November 2016
Published: 23 January 2017
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Authors |
| Walter Gubler | |
| Fakultät für Mathematik Universität Regensburg Universitätsstraße 31 D-93040 Regensburg Germany |
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| Klaus Künnemann | |
| Fakultät für Mathematik Universität Regensburg Universitätsstraße 31 D-93040 Regensburg Germany |
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