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Non-semisimple extended topological quantum field theories

About this Title

Marco De Renzi

Publication: Memoirs of the American Mathematical Society
Publication Year: 2022; Volume 277, Number 1364
ISBNs: 978-1-4704-5269-8 (print); 978-1-4704-7096-8 (online)
DOI: https://doi.org/10.1090/memo/1364
Published electronically: April 1, 2022
Keywords: Extended topological quantum field theories, non-semisimple categories, quantum invariants, 2-categories

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Table of Contents

Chapters

  • Preface
  • 1. Relative modular categories
  • 2. Admissible cobordisms
  • 3. Extension of Costantino-Geer-Patureau invariants
  • 4. Combinatorial and topological properties
  • 5. Graded extensions
  • 6. Symmetric monoidality
  • 7. Characterization of the image
  • A. Unrolled quantum groups
  • B. Manifolds and cobordisms with corners
  • C. Signature defects
  • D. Symmetric monoidal 2-categories
  • E. Complete linear and graded linear categories

Abstract

We develop the general theory for the construction of Extended Topological Quantum Field Theories (ETQFTs) associated with the Costantino-Geer-Patureau quantum invariants of closed 3-manifolds. In order to do so, we introduce relative modular categories, a class of ribbon categories which are modeled on representations of unrolled quantum groups, and which can be thought of as a non-semisimple analogue to modular categories. Our approach exploits a 2-categorical version of the universal construction introduced by Blanchet, Habegger, Masbaum, and Vogel. The 1+1+1-EQFTs thus obtained are realized by symmetric monoidal 2-functors which are defined over non-rigid 2-categories of admissible cobordisms decorated with colored ribbon graphs and cohomology classes, and which take values in 2-categories of complete graded linear categories. In particular, our construction extends the family of graded 2+1-TQFTs defined for the unrolled version of quantum $\mathfrak {sl}_2$ by Blanchet, Costantino, Geer, and Patureau to a new family of graded ETQFTs. The non-semisimplicity of the theory is witnessed by the presence of non-semisimple graded linear categories associated with critical 1-manifolds.

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