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Homological smoothness and Deligne resolution for tropical fans

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arxiv 2405.05718 v1 pith:IMVO3JVH submitted 2024-05-09 math.AG math.ATmath.CO

classification math.AGmath.ATmath.CO
keywords tropicalfanshomologicallysmoothlocallydelignehomologicalhomology
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We say that a tropical fan is homologically smooth if each of its open subsets verify tropical Poincare duality. A tropical homology manifold is a tropical variety that is locally modelled by open subsets of homologically smooth tropical fans. We show that homological smoothness is a T-stable property in the category of tropical fans. This implies in particular that quasilinear fans are homologically smooth, and tropical varieties locally modelled by them are tropical homology manifolds. Previously, this was known only for locally matroidal tropical varieties. In order to show the above results, we prove a tropical analogue of the Deligne weight spectral sequence for homologically smooth tropical fans. This allows to describe the cohomology of tropical modifications, and will be of importance in our companion work which develops a Hodge theory in the tropical setting.

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  1. Tropical Abel-Jacobi theory

    math.AG 2025-04 accept novelty 8.0 of 10

    A functorial Abel-Jacobi map is constructed for all compact tropical varieties, and the tropical Ceresa class of a curve is computed explicitly from the graph and edge lengths.

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