English

Reflective centers as categories of modules

Category Theory 2025-06-11 v2

Abstract

In [LWY23] the authors construct the reflective center of a module category M over a braided monoidal category B. The reflective center is by construction a braided module category over B. In the case where B is the category of modules over a finite dimensional quasitriangular Hopf algebra H, acting on the category of modules over a comodule algebra, they construct a comodule algebra, the reflective algebra, whose modules are precisely the reflective center. In the construction, Majid's transmutation of H plays a crucial r{\^o}le. This note centers on the transmuted H, seeking to ''explain'' its appearance through a generalization in which the acting category is no longer a module category, but admits an internal reconstructed Hopf algebra; the transmutation is a special case of this notion. As a result, in certain cases, the reflective center is simply the category of modules in M over that Hopf algebra in B.

Keywords

Cite

@article{arxiv.2505.07343,
  title  = {Reflective centers as categories of modules},
  author = {Peter Schauenburg},
  journal= {arXiv preprint arXiv:2505.07343},
  year   = {2025}
}
R2 v1 2026-06-28T23:29:14.257Z