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Multigraded Castelnuovo–Mumford regularity via Klyachko filtrations

  • Rosa M. Miró-Roig and Martí Salat-Moltó ORCID logo EMAIL logo
Published/Copyright: November 24, 2021

Abstract

In this paper, we consider r-graded modules on the Cl(X)-graded Cox ring [x1,,xr] of a smooth complete toric variety X. Using the theory of Klyachko filtrations in the reflexive case, we construct a collection of lattice polytopes codifying the multigraded Hilbert function of the module. We apply this approach to reflexive s+r+2-graded modules over any non-standard bigraded polynomial ring [x0,,xs,y0,,yr]. In this case, we give sharp bounds for the multigraded regularity index of their multigraded Hilbert function, and a method to compute their Hilbert polynomial.


Communicated by Jan Bruinier


Funding statement: The first author was partially supported by PID2020-113674GB-I00. The second author is partially supported by MDM-2014-0445-18-2.

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Received: 2021-06-12
Revised: 2021-10-14
Published Online: 2021-11-24
Published in Print: 2022-01-01

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