Year: 2026
Type: preprint
Abstract: Zhang twists provide a powerful mechanism for deforming graded algebras, while preserving their graded module categories. We extend this theory by introducing Zhang twists for graded semigroups and graded ample groupoids. We show that the twisting construction preserves a broad class of semigroup structures, and that two graded monoids are twists of each other if and only if their categories of graded sets are pointedly equivalent. We show that Zhang twists are compatible with noncommutative Stone duality: twists on graded-Boolean inverse semigroups are in correspondence with those on the associated graded ample groupoids. Moreover, in the setting of Steinberg algebras we prove that twisting the groupoid gives the same result as twisting the corresponding algebra. These results provide a unified framework linking graded semigroups, inverse semigroup duality, ample groupoids, and graded algebras, while extending the scope of Zhang twists to settings arising from symbolic dynamics, graph algebras, and Steinberg algebras.
Source: arXiv (Cornell University)
Language: English
Subfield: Mathematical Physics
Field: Mathematics
Domain: Physical Sciences
Open Access status: green
Funders: National Science Foundation, Marsden Fund
OpenAlex ID: W7222752851