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We define a symmetric monoidal (4,3)-category with duals whose objects are certain enriched multi-fusion categories. For every modular tensor category $\mathcal{C}$, there is a self enriched multi-fusion category $\mathfrak{C}$ giving rise…

Quantum Algebra · Mathematics 2017-04-21 Hao Zheng

Topological quantum field theories (TQFTs) are symmetric monoidal functors out of cobordism categories. In dimension two, oriented TQFTs are famously classified by commutative Frobenius algebras. In the unoriented setting, the…

Quantum Algebra · Mathematics 2025-12-11 Leon J. Goertz , Paul Wedrich

We give a categorical setting in which Penrose graphical calculus naturally extends to graphs drawn on the boundary of a handlebody. We use it to introduce invariants of 3-manifolds presented by Heegaard splittings. We recover Kuperberg…

Quantum Algebra · Mathematics 2020-07-15 Francesco Costantino , Nathan Geer , Bertrand Patureau-Mirand , Vladimir Turaev

We give a finite presentation of the cobordism symmetric monoidal bicategory of (smooth, oriented) closed manifolds, cobordisms and cobordisms with corners as an extension of the bicategory of closed manifolds, cobordisms and…

Geometric Topology · Mathematics 2026-01-13 Benjamin Haïoun

The construction of the topologically protected code space of Kitaev's model for fault-tolerant quantum computation is extended from complex semisimple to arbitrary finite-dimensional Hopf algebras admitting pairs in involution. One input…

Quantum Algebra · Mathematics 2025-06-12 Sebastian Halbig , Ulrich Krähmer

We introduce a version of skein categories of surfaces which depends on a tensor ideal in a linear ribbon category, thereby extending the existing theory to the setting of non-semisimple TQFTs. We obtain modified notions of skein algebras…

Quantum Algebra · Mathematics 2026-01-29 Jennifer Brown , Benjamin Haïoun

We develop an explicit skein theoretical algorithm to compute the Alexander polynomial of a 3-manifold from a surgery presentation employing the methods used in the construction of quantum invariants of 3-manifolds. As a prerequisite we…

Geometric Topology · Mathematics 2013-06-03 Thomas Kerler

All rational semisimple braided tensor categories are representation categories of weak quasi Hopf algebras. To proof this result we construct for any given category of this kind a weak quasi tensor functor to the category of finite…

q-alg · Mathematics 2008-02-03 Reinhard Häring

Nearly Frobenius structures and 2-dimensional Almost TQFTs were introduced and shown to be in categorical equivalence in arXiv:1907.05470 in the attempt to extend the Atiyah-Segal's definition to the category of infinite dimensional vector…

Algebraic Geometry · Mathematics 2025-11-14 William Davis , Olivia Dumitrescu

We systematically study noncommutative and nonassociative algebras A and their bimodules as algebras and bimodules internal to the representation category of a quasitriangular quasi-Hopf algebra. We enlarge the morphisms of the monoidal…

Quantum Algebra · Mathematics 2015-02-09 Gwendolyn E. Barnes , Alexander Schenkel , Richard J. Szabo

Reshetikhin-Turaev (a.k.a. Chern-Simons) TQFT is a functor that associates vector spaces to two-dimensional genus g surfaces and linear operators to automorphisms of surfaces. The purpose of this paper is to demonstrate that there exists a…

High Energy Physics - Theory · Physics 2024-09-17 Semeon Arthamonov , Shamil Shakirov

We study a special sort of 2-dimensional extended Topological Quantum Field Theories (TQFTs) which we call open-closed TQFTs. These are defined on open-closed cobordisms by which we mean smooth compact oriented 2-manifolds with corners that…

Algebraic Topology · Mathematics 2008-02-22 Aaron D. Lauda , Hendryk Pfeiffer

We work in the reduced SU(N,K) modular category as constructed recently by Blanchet. We define spin type and cohomological refinements of the Turaev-Viro invariants of closed oriented 3-manifolds and give a formula relating them to…

Geometric Topology · Mathematics 2007-05-23 Anna Beliakova

We introduce new polynomial invariants of a finite-dimensional semisimple and cosemisimple Hopf algebra A over a field by using the braiding structures of A. We investigate basic properties of the polynomial invariants including stability…

Quantum Algebra · Mathematics 2009-07-02 Michihisa Wakui

A classical result in quantum topology is that oriented 2-dimensional topological quantum field theories (2-TQFTs) are fully classified by commutative Frobenius algebras. In 2006, Turaev and Turner introduced additional structure on…

Quantum Algebra · Mathematics 2025-11-04 Agustina Czenky , Jacob Kesten , Abiel Quinonez , Chelsea Walton

The goal of this work is to describe a categorical formalism for (Extended) Topological Quantum Field Theories (TQFTs) and present them as functors from a suitable category of cobordisms with corners to a linear category, generalizing 2d…

Quantum Algebra · Mathematics 2011-08-29 Mark Feshbach , Alexander A. Voronov

We define an exactly solvable model for 2+1D topological phases of matter on a triangulated surface derived from a crossed module of semisimple finite-dimensional Hopf algebras, the `Hopf-algebraic higher Kitaev model'. This model…

Mathematical Physics · Physics 2024-10-25 Vincent Koppen , João Faria Martins , Paul Purdon Martin

We revisit the question of whether the Crane-Yetter topological quantum field theory (TQFT) associated to a modular tensor category admits a fully extended refinement. More specifically, we use tools from stable homotopy theory to classify…

Mathematical Physics · Physics 2025-06-06 Luuk Stehouwer

We construct families of TQFT's over the finite field Z/pZ starting from an integral TQFT obtained by Frohman and Nicas. These TQFT's are likely to describe the constant order contributions of the cyclotomic integer expansions of the…

Geometric Topology · Mathematics 2009-09-25 Thomas Kerler

This paper is devoted to the study of algebraic structures leading to link homology theories. The originally used structures of Frobenius algebra and/or TQFT are modified in two directions. First, we refine 2-dimensional cobordisms by…

Geometric Topology · Mathematics 2009-10-28 Anna Beliakova , Emmanuel Wagner