The Gröbner fan of the Hilbert scheme

Autor: Yuta Kambe, Paolo Lella
Rok vydání: 2020
Předmět:
Zdroj: Annali di Matematica Pura ed Applicata (1923 -). 200:547-594
ISSN: 1618-1891
0373-3114
DOI: 10.1007/s10231-020-01006-0
Popis: We give a notion of “combinatorial proximity” among strongly stable ideals in a given polynomial ring with a fixed Hilbert polynomial. We show that this notion guarantees “geometric proximity” of the corresponding points in the Hilbert scheme. We define a graph whose vertices correspond to strongly stable ideals and whose edges correspond to pairs of adjacent ideals. Every term order induces an orientation of the edges of the graph. This directed graph describes the behavior of the points of the Hilbert scheme under Grobner degenerations with respect to the given term order. Then, we introduce a polyhedral fan that we call Grobner fan of the Hilbert scheme. Each cone of maximal dimension corresponds to a different directed graph induced by a term order. This fan encodes several properties of the Hilbert scheme. We use these tools to present a new proof of the connectedness of the Hilbert scheme. Finally, we improve the technique introduced in the paper “Double-generic initial ideal and Hilbert scheme” (Bertone et al. in Ann Mat Pura Appl (4) 196(1):19–41, 2017) to give a lower bound on the number of irreducible components of the Hilbert scheme.
Databáze: OpenAIRE
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