Schur multiplier and Schur covers of relative Rota-Baxter groups

Abstract

Relative Rota-Baxter groups are generalizations of Rota-Baxter groups and share a close connection with skew left braces. These structures are well-known for offering bijective non-degenerate set-theoretical solutions to the Yang-Baxter equation. This paper builds upon the recently introduced extension theory and low-dimensional cohomology of relative Rota-Baxter groups. We prove an analogue of the Hochschild-Serre exact sequence for central extensions of relative Rota-Baxter groups. We introduce the Schur multiplier $M_{RRB}(\mathcal{A})$ of a relative Rota-Baxter group $\mathcal{A}=(A,B,\beta ,T)$, and prove that the exponent of $M_{RRB}(\mathcal{A})$ divides $|A||B|$ when $\mathcal{A}$ is finite. We define weak isoclinism of relative Rota-Baxter groups, introduce their Schur covers, and prove that any two Schur covers of a finite bijective relative Rota-Baxter group are weakly isoclinic. The results align with recent results of Letourmy and Vendramin for skew left braces.

29 pages. arXiv admin note: text overlap with arXiv:2309.00692

References in corpus (5)

• Rota-Baxter operators on Clifford semigroups and the Yang-Baxter equation
• Isoclinism of skew braces
• Extensions and automorphisms of Rota-Baxter groups
• Relative Rota-Baxter groups and skew left braces
• Schur covers of skew braces

Cited by in corpus (2)

• Relative Rota-Baxter groups and skew left braces
• Cohomology and Extensions of Relative Rota-Baxter groups