Zhang twists for semigroups and groupoids, with applications to Steinberg algebras

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.

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BibTeX RIS

BibTeX

@misc{hazrat2026zhang,
  title = {{Zhang twists for semigroups and groupoids, with applications to Steinberg algebras}},
  author = {Roozbeh Hazrat and Zachary Mesyan and Benjamin Steinberg},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.21005},
  eprint = {2610.21005},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.21005},
  note = {CC BY 4.0},
}

RIS

TY  - UNPB
TI  - Zhang twists for semigroups and groupoids, with applications to Steinberg algebras
AU  - Roozbeh Hazrat
AU  - Zachary Mesyan
AU  - Benjamin Steinberg
PY  - 2026
DA  - 2026/10/14
PB  - arXiv
DO  - 10.48550/arxiv.2610.21005
UR  - https://arxiv.org/abs/2610.21005
AB  - 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.
ER  -

Abstract

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