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Monodromy filtrations and the topology of tropical varieties.(English)Zbl 1312.14145

Summary: We study the topology of tropical varieties that arise from a certain natural class of varieties. We use the theory of tropical degenerations to construct a natural, “multiplicity-free” parameterization of \(\text{Trop}(X)\) by a topological space \(\Gamma_X\) and give a geometric interpretation of the cohomology of \(\Gamma_X\) in terms of the action of a monodromy operator on the cohomology of \(X\). This gives bounds on the Betti numbers of \(\Gamma_X\) in terms of the Betti numbers of \(X\) which constrain the topology of \(\operatorname{Trop}(X)\). We also obtain a description of the top power of the monodromy operator acting on middle cohomology of \(X\) in terms of the volume pairing on \(\Gamma_X\).

MSC:

14T05 Tropical geometry (MSC2010)
14D06 Fibrations, degenerations in algebraic geometry
12K10 Semifields
14M25 Toric varieties, Newton polyhedra, Okounkov bodies
14N10 Enumerative problems (combinatorial problems) in algebraic geometry
52B20 Lattice polytopes in convex geometry (including relations with commutative algebra and algebraic geometry)

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