Invited Talks at Workshops and Conferences
- 07/2026 Conference Applied Category theory (ACT) 2026, Tallinn, Estonia
Topological Quantum Field Theories with Defects - 03/2026 Workshop 2612 Higher Structures from Symmetries in Quantum Field Theory, MFO Oberwolfach
Trisection invariants of four-manifolds - 12/2025 Workshop The Many Faces of Boundaries, Impurities, and Defects,
Isaac Newton Institute for Mathematical Sciences, Cambridge
Diagrammatic calculus and 3d state sums with defects - 10/2025 Workshop Diving Deeper into Defects, Isaac Newton Institute for Mathematical Sciences, Cambridge
3d Dijkgraaf-Witten TQFT with defects - 07/2025 Workshop Subfactors and Applications, MFO Oberwolfach
Geometric formulation of Dijkgraaf-Witten TQFT with defects - 07/2025 Workshop Spaces of tensor categories, ICMS, Edinburgh
Categorical Trisection Invariants - 03/2025 Opening conference CRC 1624 Higher structures, Moduli spaces and Integrability, Hamburg,
Dijkgraaf-Witten TQFT with defects - 02/2025 Workshop Journées de topologie algébrique, géométrique et quantique en Picardie II, Amiens,
Dijkgraaf-Witten TQFT with defects - 12/2024 Workshop ARTIN in Leeds
Dijkgraaf-Witten TQFT with defects - 09/2024 60th Seminar Sophus Lie, Paderborn,
Dijkgraaf-Witten theory with defects - 07/2024 Workshop Higher Structures and Field Theory and RHIND Seminar, Munich,
Dijkgraaf-Witten TQFT with defects - 03/2024 Higher Categorical Tools for Quantum Phases of Matter, Perimeter Institute, Waterloo, Ontario, Canada,
Quantum double models and Dijkgraaf-Witten TQFT with defects - 02/2024 Plenary Talk, ANZAMP Meeting 2024, Katoomba, Australia,
Defects in Turaev-Viro state sums and Kitaev’s lattice model - 10/2023 Topological Quantum Computation, ICMS, Edinburgh, UK,
Turaev-Viro state sums with defects - 08/2023 Categorical Symmetries in Quantum Field Theories,
Simons Collaboration on Global Categorical Symmetries, Les Diablerets, Switzerland
Turaev-Viro-Barrett-Westbury state sums with defects - 08/2023 Higher Structures in Functorial Field Theory, CRC 1085, Regensburg
Turaev-Viro-Barrett-Westbury state sums with defects - 03/2023 Interactions between Poisson Geometry and Quantisation
Lecture series on TQFTs with defects - 03/2022 Main lecture, DPG spring meeting 2022,
State sum models with defects - 09/2021 Corfu Summer Institute: Workshop on Quantum geometry, Field theory and Gravity
3d state sum models with defects - 08/2021 GEOQUANT 2021,
Turaev-Viro state sums with defects - 02/2021 Women at the Intersection of Mathematics and Physics, Perimeter Institute for Theoretical Physics,
State sum models with defects - 11/2019 Emmy Noether Workshop: the structure of quantum spacetime,
Perimeter Institute for Theoretical Physics
Ideal tetrahedra and their duals - 09/2019 Women in Geometry and Topology,
Plenary Talk, CRM, Barcelona
Ideal tetrahedra and their duals - 06/2019 Defects in Topological and Conformal Field Theory
King’s College, London
Mapping class group actions in Kitaev lattice models - 04/2019 Bayrischzell Workshop 2019
Bayrischzell
Mapping class group actions on quantised connections - 07/2018 Gauge theories and applications
University of Regensburg
Graph Gauge theories with Hopf algebras - 07/2018 3rd Bavarian Geometry and Topology Meeting,
University of Regensburg
Ideal tetrahedra and their Duals in 3d geometry - 07/2018 12th International ICMAT Summer School
on Geometry, Mechanics and Control
Santiago de Compostela
Lecture Series on Poisson-Lie Groups - 04/2018 TQFT and Categorification
Cargèse, Corsica
Mapping class group actions in Hopf algebra gauge theory - 02/2018 Workshop on Higher Gauge Theory,
University of Leeds
Mapping class group actions in Kitaev models and Hopf algebra gauge theory - 09/2017 100ème rencontre entre mathématiciens
et physiciens théoriciens,
IRMA, Strasbourg
Ideal tetrahedra and their duals in 3d gravity - 07/2017 Hopf Algebras in Kitaev’s Quantum Double Models
Perimeter Institute for Theoretical Physics,
Waterloo, Canada
Kitaev lattice models as a Hopf algebra gauge theory - 06/2017 GQT Graduate School and Colloquium
Den Dolder, Netherlands
Graph gauge theories with Hopf algebras - 06/2017 Meeting on Noncommutative geometry and gravity
ESI, Vienna
Poisson homogeneous spaces in (2+1) gravity - 06/2017 Teichmueller theory and geometric structures on 3-dimensional manifolds,
University of Luxembourg
Ideal tetrahedra and their duals in 3d model spacetimes - 05/2017 Foundational and Structural Aspects of Gauge Theories,
MITP, Mainz
Hopf algebra gauge theories on ribbon graphs - 03/2017 Workshop on Quantum Topology,
Université Lille 1
Kitaev lattice models as a Hopf algebra gauge theory - 03/2017 Women at the Intersection of Mathematics and High Energy Physics
MITP, Mainz
Kitaev lattice models as a Hopf algebra gauge theory - 08/2016 Quantum Structure of Spacetime and Gravity,
COST network QSPACE, University of Belgrade
Lecture series on 3d gravity - 07/2016 Classical and quantum symmetries in mathematics and physics,
University of Jena
Hopf algebra symmetries in 3d gravity - 07/2016 Modelling Topological Phases of Matter
University of Leeds
Kitaev lattice models as a Hopf algebra gauge theory - 04/2016 QG^2: Quantum Groups in Quantum Gravity,
University of Waterloo, Canada
Lecture Series: Mathematical approaches to 3d gravity - 10/2016 Quantum Spacetime ’16,
Cost network QSPACE, Zakopane
Hopf algebra gauge theories and Kitaev models - 01/2016 Colored Graphs and Random Tensors
LPT, Université Paris Sud, Orsay
Hopf algebras and ribbon graphs - 10/2015 Higher topological quantum field theory and categorical quantum mechanics,
ESI, Vienna
Gray categories with duals and their diagrammatical description - 09/2015 Workshop on Noncommutative Field Theory and Gravity,
Corfu, Greece
Hopf algebra gauge theory and Kitaev lattice models - 06/2015 4th Seminar on Conformal Field theory,
University of Darmstadt
Hopf algebra gauge theory from Kitaev lattice models - 06/2015 2015 AMS-EMS-SPM International Meeting
University of Porto
Topological lattice models as quantum gauge theories - 06/2014 93ème rencontre entre mathématiciens et physiciens théoriciens:
Riemann, la topologie et la physique
IRMA, Strasbourg
Generalised shear coordinates on moduli spaces of (2+1)-spacetimes - 02/2014 Modern trends in topological quantum field theory,
ESI, Vienna
Diagrams for Gray categories with duals - 08/2013 Workshop on 3d gravity
University of Worclaw
Dynamical classical r-matrices in 3d gravity - 09/2012 90ème rencontre entre physiciens théoriciens et mathématiciens:
Lie et Klein; le programme d’Erlangen et son impact en physique et en mathématique,
IRMA, Strasbourg
Dirac gauge fixing and dynamical classical r-matrix symmetries in (2+1)-gravity - 08/2012 XXI International Fall Workshop on Geometry and Physics
University of Burgos, Spain
Gauge fixing and dynamical r-matrices in Chern-Simons theory - 09/2011 Workshop on Noncommutative Field Theory and Gravity,
Corfu, Greece
Gauge fixing and dynamical r-matrices in (2+1)-gravity - 06/2011 87ème rencontre entre physiciens théoriciens et mathématiciens:
Géométrie de Lorentz en mathématiques et en physique,
Irma, Strasbourg
Causality in 3d-spacetimes with particles - 03/2011 Main Lecture, DPG spring meeting 2011
KIT, Karlsruhe
Geometry and Observables in 3- dimensional (Quantum-) Gravity - 09/2010 Geometry and Physics in Cracow
University of Cracow
Observables for 3d gravity from higher categories - 09/2010 CLP 7 – Categories, Logics and Physics
University of Birmingham
Higher categories and observables for generalised Turaev-Viro models - 09/2010 Walkshop on Mathematical Physics,
University of Jena
Global geometry of Lorentzian 3-manifolds via lightlike geodesics - 09/2010 Workshop on Quantum Groups,
University of Caen-Basse Normandie
Quantum group symmetries and the torus universe - 05/2010 Noncommutativity and Physics: Spacetime Quantum Geometry
Bayrischzell, Germany
Observables for quantum gravity from higher categories - 04/2010 Géodycauserie III: Analysis, Geometry and Dynamics on Lorentz manifolds
ENS Lyon
Observers, time and measurements in 3d gravity - 04/2010 Workshop QG10,
Max Planck Institute for the Physics of Complex Systems, Dresden
Gauge fixing and dynamical quantum group symmetries in (2+1)-gravity - 12/2009 Géodycauserie II: Spacetimes with particles
University of Avignon
Observables associated to constant curvature spacetimes - 12/2009 Transformation groups and Mathematical Physics
Hamburg University
Global geometry of Lorentzian 3-manifolds via lightlike geodesics - 09/2009 2nd School and Workshop on Quantum Gravity and Quantum Geometry,
Corfu, Greece
Geometry and observables in (2+1)-gravity - 08/2009 Chern-Simons Gauge Theory: 20 years after
Hausdorff Center for Mathematics, Bonn
Getting Physics from (2+1)-gravity: What does an observer in 3d gravity see? - 06/2009 XXV Max Born Symposium: The Planck Scale,
University of Wroclaw
Getting Physics from (2+1)-gravity: measurements via lightrays - 04/2009 Workshop on Gravity in Three Dimensions,
ESI, Vienna
Cosmological measurements, time, and observables in (2+1)-gravity - 07/2008 Noncommutative Deformations of Special Relativity,
ICMS, Edinburgh
Quantum double and kappa-Poincaré symmetries in (2+1)-gravity and Chern-Simons theory - 06/2008 QG2 2008: Quantum Geometry and Quantum Gravity
The University of Nottingham
3d loop quantum gravity and combinatorial quantisation - 06/2008 Theory Canada 4,
Centre de Recherches Mathématiques, Montreal
Quantum double and kappa-Poincaré symmetries in 3d gravity and Chern-Simons theory - 06/2007 Loops 07,
Morelia, Mexico
The cosmological constant in 3d gravity: towards a unified approach - 07/2006 Noncommutative Geometry and Physics: Fundamental Structure of Space and Time,
Isaac Newton Institute for Mathematical Sciences, Cambridge
(2+1)-dimensional gravity in the geometrical and in the Chern-Simons formulation - 10/2005 Loops ’05,
Max Planck Institute for Gravitational Physics, Golm, Germany
Grafting and Poisson structure in (2+1)-gravity with Lambda=0 - 07/2005 Classical and quantum gravity in 3 dimensions,
Scuola Normale Superiore, Pisa
Grafting and Poisson structure in (2+1)-gravity with Lambda=0 - 10/2004 Quantum Gravity in the Americas,
Perimeter Institute for Theoretical Physics
Waterloo, Canada
Phase space and Quantization of (2+1)-dimensional gravity in the Chern-Simons formulation - 06/2003 Geometry and physics of three-dimensional quantum gravity,
ICMS, Edinburgh
On the quantisation of (2+1)-dimensional gravity in the Chern-Simons formulation