Conjecture on Poincaré duality and ring structures for tropical varieties

Let FF be a tropical variety. Write HH(F)\overline{HH}^\bullet(F) for its large cohomology, H(F)\overline{H}_\bullet(F) for its large homology, and let

DF:HH(F)H(F)D_F:\overline{HH}^\bullet(F)\to\overline{H}_\bullet(F)

be the Poincaré duality map. A tropical variety is regularizable in codimension 1 when it has the regularizability property in codimension 11, and it is irreducible in the usual tropical sense. For a regularizable, irreducible FF, let A\mathcal{A} denote the ring structure on H(F)\overline{H}_\bullet(F) induced by the product on HH(F)\overline{HH}^\bullet(F), and let B\mathcal{B} denote the ring structure induced by the ambient space when FF is diagonalizable.

Poincaré duality and ring-structure conjecture. The map DFD_F is surjective for every tropical variety FF. If FF is regularizable in codimension 11 and irreducible, then its kernel is an ideal, FF is diagonalizable, and the induced ring structures A\mathcal{A} and B\mathcal{B} on H(F)\overline{H}_\bullet(F) coincide.

The conjecture packages expected compatibility between large tropical cohomology, large tropical homology, and the ambient intersection product. The source gives no resolution status for these assertions; in particular, the claims remain open here.

Sources & referencesView supporting material

Primary source

Alexander Esterov, “Tropical varieties with polynomial weights and corner loci of piecewise polynomials”, arXiv:1012.5800 (2011).

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