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arXiv · 1903.12106

Birational sequences and the tropical Grassmannian

Lara Bossinger
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Abstract

We introduce iterated sequences for Grassmannians, a new class of Fang-Fourier-Littelmanns' birational sequences and explain how they give rise to points in $\text{trop}(\text{Gr}(k,\mathbb C^n))$, Speyer-Sturmfels' tropical Grassmannian. For $\text{Gr}(2,\mathbb C^n)$ we show that the associated valuations induce toric degenerations. We describe recursively the vertices of the corresponding Newton--Okounkov polytopes, which are particular vertices of a hypercube and hence integral. We show further that every toric degeneration of $\text{Gr}(2,\mathbb C^{n})$ constructed using the tropical Grassmannian can be recovered by iterated sequences.

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BibTeXRIS

Lara Bossinger. 2021-05-11. Birational sequences and the tropical Grassmannian. https://doi.org/10.1016/j.jalgebra.2021.04.028

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