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1 October 2017 A tropical approach to a generalized Hodge conjecture for positive currents
Farhad Babaee, June Huh
Duke Math. J. 166(14): 2749-2813 (1 October 2017). DOI: 10.1215/00127094-2017-0017

Abstract

In 1982, Demailly showed that the Hodge conjecture follows from the statement that all positive closed currents with rational cohomology class can be approximated by positive linear combinations of integration currents. Moreover, in 2012, he showed that the Hodge conjecture is equivalent to the statement that any (p,p)-dimensional closed current with rational cohomology class can be approximated by linear combinations of integration currents. In this article, we find a current which does not verify the former statement on a smooth projective variety for which the Hodge conjecture is known to hold. To construct this current, we extend the framework of “tropical currents”—recently introduced by the first author—from tori to toric varieties. We discuss extremality properties of tropical currents and show that the cohomology class of a tropical current is the recession of its underlying tropical variety. The counterexample is obtained from a tropical surface in R4 whose intersection form does not have the right signature in terms of the Hodge index theorem.

Citation

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Farhad Babaee. June Huh. "A tropical approach to a generalized Hodge conjecture for positive currents." Duke Math. J. 166 (14) 2749 - 2813, 1 October 2017. https://doi.org/10.1215/00127094-2017-0017

Information

Received: 9 March 2016; Revised: 27 February 2017; Published: 1 October 2017
First available in Project Euclid: 6 September 2017

zbMATH: 06803182
MathSciNet: MR3707289
Digital Object Identifier: 10.1215/00127094-2017-0017

Subjects:
Primary: 14M25, 14T05, 32U40
Secondary: 14C30, 42B05

Rights: Copyright © 2017 Duke University Press

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Vol.166 • No. 14 • 1 October 2017
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