English

2D HQFTs and Frobenius $(\mathcal{G},\mathcal{V})$-categories

Quantum Algebra 2025-01-20 v1

Abstract

Homotopy Quantum Field Theories as variants of Topological Quantum Field Theories are described by functors from some cobordism category, enriched with homotopical data, to a symmetric monoidal category V\mathcal{V}. A new notion of HQFTs is introduced using target pairs of spaces (X,Y)(X,Y) acounting for basepoints being sent to points in YY. Such (X,Y)(X,Y)-HQFTs are classified in dimension 1 by dualizable representations of G:=Π1(X,Y)\mathcal{G}:=\Pi_1(X,Y), the relative fundamental groupoid. For dimension 2, the notion of crossed loop Frobenius (G,V)(\mathcal{G},\mathcal{V})-categories is introduced, generalizing crossed Frobenius GG-algebras, where GG is only a group. After stating generalities of these multi-object generalizations, a classification theorem of 2-dimensional (X,Y)(X,Y)-HQFTs via crossed loop Frobenius (G,V)(\mathcal{G},\mathcal{V})-categories is proven.

Keywords

Cite

@article{arxiv.2501.10113,
  title  = {2D HQFTs and Frobenius $(\mathcal{G},\mathcal{V})$-categories},
  author = {Paul Großkopf},
  journal= {arXiv preprint arXiv:2501.10113},
  year   = {2025}
}

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31 pages