Fano schemes of complete intersections in toric varieties

Nathan Ilten, Tyler Kelly

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Abstract

We study Fano schemes Fk(X) for complete intersections X in a projective toric variety Y ⊂ Pn. Our strategy is to decompose Fk(X) into closed subschemes based on the irreducible decomposition of Fk(Y ) as studied by Ilten and Zotine. We define the “expected dimension” for these subschemes, which always gives a lower bound on the actual dimension. Under additional assumptions, we show that these subschemes are non-empty and smooth of the expected dimension. Using tools from intersection theory, we can apply these results to count the number of linear subspaces in X when the expected dimension of Fk(X) is zero.
Original languageEnglish
JournalMathematische Zeitschrift
Early online date18 Aug 2021
DOIs
Publication statusPublished - 18 Aug 2021

ASJC Scopus subject areas

  • Mathematics(all)

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