Salvato in:
| Autori principali: | , , , |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2025
|
| Soggetti: | |
| Accesso online: | https://arxiv.org/abs/2507.19879 |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866914603535958016 |
|---|---|
| author | Hazrat, Roozbeh Mukherjee, Promit Pask, David Sardar, Sujit Kumar |
| author_facet | Hazrat, Roozbeh Mukherjee, Promit Pask, David Sardar, Sujit Kumar |
| contents | This paper lays out the foundations of graded $K$-theory for Leavitt algebras associated with higher-rank graphs, also known as Kumjian-Pask algebras, establishing it as a potential tool for their classification.
For a row-finite $k$-graph $Λ$ without sources, we show that there exists a $\mathbb{Z}[\mathbb{Z}^k]$-module isomorphism between the graded zeroth (integral) homology $H_0^{gr}(\mathcal{G}_Λ)$ of the infinite path groupoid $\mathcal{G}_Λ$ and the graded Grothendieck group $K_0^{gr}(KP_\mathsf{k}(Λ))$ of the Kumjian-Pask algebra $KP_\mathsf{k}(Λ)$, which respects the positive cones (i.e., the talented monoids).
We demonstrate that the $k$-graph moves of in-splitting and sink deletion defined by Eckhardt et al. (Canad. J. Math. 2022) preserve the graded $K$-theory of associated Kumjian-Pask algebras and produce algebras which are graded Morita equivalent, thus providing evidence that graded $K$-theory may be an effective invariant for classifying certain Kumjian-Pask algebras.
We also determine a natural sufficient condition regarding the fullness of the graded Grothendieck group functor. More precisely, for two row-finite $k$-graphs $Λ$ and $Ω$ without sources and with finite object sets, we obtain a sufficient criterion for lifting a pointed order-preserving $\mathbb{Z}[\mathbb{Z}^k]$-module homomorphism between $K_0^{gr}(KP_\mathsf{k}(Λ))$ and $K_0^{gr}(KP_\mathsf{k}(Ω))$ to a unital graded ring homomorphism between $KP_\mathsf{k}(Λ)$ and $KP_\mathsf{k}(Ω)$. For this we adopt, in the setting of $k$-graphs, the bridging bimodule technique recently introduced by Abrams, Ruiz and Tomforde (Algebr. Represent. Theory 2024). |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_19879 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Higher-rank graphs and the graded $K$-theory of Kumjian-Pask algebras Hazrat, Roozbeh Mukherjee, Promit Pask, David Sardar, Sujit Kumar K-Theory and Homology Operator Algebras Rings and Algebras primary 16W50, 19A49, 19D55, secondary 22A22, 37B10 This paper lays out the foundations of graded $K$-theory for Leavitt algebras associated with higher-rank graphs, also known as Kumjian-Pask algebras, establishing it as a potential tool for their classification. For a row-finite $k$-graph $Λ$ without sources, we show that there exists a $\mathbb{Z}[\mathbb{Z}^k]$-module isomorphism between the graded zeroth (integral) homology $H_0^{gr}(\mathcal{G}_Λ)$ of the infinite path groupoid $\mathcal{G}_Λ$ and the graded Grothendieck group $K_0^{gr}(KP_\mathsf{k}(Λ))$ of the Kumjian-Pask algebra $KP_\mathsf{k}(Λ)$, which respects the positive cones (i.e., the talented monoids). We demonstrate that the $k$-graph moves of in-splitting and sink deletion defined by Eckhardt et al. (Canad. J. Math. 2022) preserve the graded $K$-theory of associated Kumjian-Pask algebras and produce algebras which are graded Morita equivalent, thus providing evidence that graded $K$-theory may be an effective invariant for classifying certain Kumjian-Pask algebras. We also determine a natural sufficient condition regarding the fullness of the graded Grothendieck group functor. More precisely, for two row-finite $k$-graphs $Λ$ and $Ω$ without sources and with finite object sets, we obtain a sufficient criterion for lifting a pointed order-preserving $\mathbb{Z}[\mathbb{Z}^k]$-module homomorphism between $K_0^{gr}(KP_\mathsf{k}(Λ))$ and $K_0^{gr}(KP_\mathsf{k}(Ω))$ to a unital graded ring homomorphism between $KP_\mathsf{k}(Λ)$ and $KP_\mathsf{k}(Ω)$. For this we adopt, in the setting of $k$-graphs, the bridging bimodule technique recently introduced by Abrams, Ruiz and Tomforde (Algebr. Represent. Theory 2024). |
| title | Higher-rank graphs and the graded $K$-theory of Kumjian-Pask algebras |
| topic | K-Theory and Homology Operator Algebras Rings and Algebras primary 16W50, 19A49, 19D55, secondary 22A22, 37B10 |
| url | https://arxiv.org/abs/2507.19879 |