Talks in 2023
The stringor bundle
Conference "Geometries from Strings and Fields", Galileo Galilei Institute, July 2023
VideoThe stringor bundle
Workshop "Geometric/Topological Quantum Field Theories and Cobordisms", New York University Abu Dhabi, March 2023
Presentation
Talks in 2022
Transgression of higher structures to loop spaces
Workshop "Loop Space and Higher Category", online, December 2022
PresentationA representation of the string 2-group
TQFT Club Seminar, online, November 2022
Video PresentationGeometric T-Duality: Buscher rules in general topology
Program "Higher Structures and Field Theory", Erwin-Schrödinger-Institut für Mathematische Physik, August 2022
VideoDiffeology as an extension of topology by geometry
Seminar on diffeology and related topics, online, June 2022
Notes
Talks in 2021
String geometry
Seminar "Renormalisation and Geometry", Universität Potsdam, June 2021
Video
Talks in 2020
An introduction to higher parallel transport
Seminar "Algebraic and combinatorial perspectives in the mathematical sciences", online, September 2020
Presentation Video2-vector bundles, with applications to twisted K-theory and spin geometry
Program "Higher Structures and Field Theory", Erwin-Schrödinger-Institut für Mathematische Physik, August 2020
Notes
Talks in 2019
Functorial Field Theories and Spin Geometry
Mathematics Colloquium Series, New York University Abu Dhabi, November 2019
NotesStacks, Gerbes, and T-Duality
Seminar "Differential Geometry", University of Adelaide, February 2019
Notes
Talks in 2018
Fusion in loop spaces
Workshop "Geometric Quantization", Banff International Research Station for Mathematical Innovation and Discovery, April 2018
VideoNon-geometric T-duals and non-abelian gerbes
Workshop "Quantum Spacetime '18", III. Annual workshop of the COST Action MP1405 "Quantum Structure of Spacetime", Best Western Hotel Expo, Sofia, February 2018
Notes
Talks in 2017
String connections and loop spaces
Workshop "Loop spaces, supersymmetry and index theory", Nankai University at Tianjin, July 2017
Presentation
Talks in 2016
String geometry and spin geometry on loop spaces
Parallel session "Mathematical aspects of string theory and string geometry", Conference ''Classical and quantum symmetries in mathematics and physics'', Friedrich-Schiller-Universität Jena, July 2016
NotesTransgressive central extensions of loop groups
Conference "Colloquium on Algebras and Representations - Quantum 2016", Universidad Nacional de Córdoba, March 2016
Notes
Talks in 2015
String structures and supersymmetric sigma models
Program "Higher structures in string theory and quantum field theory", Erwin-Schrödinger-Institut für Mathematische Physik, December 2015
Notes
Talks in 2014
Differential string classes and loop spaces
Workshop "Differential Cohomologies", The Graduate Center, CUNY, August 2014
Notes VideoLoop group geometry and transgression
47. Seminar Sophus Lie, Schloss Rauischholzhausen, May 2014
Notes
Talks in 2013
Unendlich-Kategorien und Quantenfeldtheorie
Weihnachtskolloquium, Universität Greifswald, December 2013
PresentationLectures on gerbes, loop spaces, and Chern-Simons theory
Workshop "Chern-Simons Theory: Geometry, Topology and Physics", University of Pittsburgh, May 2013
NotesLectures on gerbes with connection
Workshop "Topological Aspects of Quantum Field Theories", National University of Singapore, January 2013
Notes
Talks in 2011
A loop space formulation for the geometry of abelian gerbes
Conference "Analysis, Geometry, and Quantum Field Theory", Universität Potsdam, October 2011
NotesGeometric string structures and supersymmetric sigma models
Workshop "Higher Gauge Theory, TQFTs, and Categorification", Cardiff University, May 2011
NotesAbelian gauge theories on loop spaces and their regression
Workshop "Higher Gauge Theory, TQFT and Quantum Gravity", Instituto Superior Técnico Lisboa, February 2011
Notes
Talks in 2010
Global Gauge Anomalies in two-dimensional Bosonic Sigma Models
Workshop "Geometry, Quantum Fields, and Strings: Categorial Aspects", Mathematisches Forschungsinstitut Oberwolfach, June 2010
NotesTransgression of Gerbes to Loop Spaces
Workshop "Higher Structures in Topology and Geometry IV", Georg-August-Universität Göttingen, June 2010
NotesChern-Simons Theory and the Categorified Group Ring
Workshop "Twisted K-Theory and Loop Groups", Talbot 2010 workshop, Breckenridge, Colorado, May 2010
Notes
Talks in 2009
String Connections and Supersymmetric Sigma Models
Workshop "Homotopy theory and higher algebraic structures", Special Section at AMS Western Section meeting, University of California at Riverside, November 2009
NotesMultiplicative Gerbes and Chern-Simons Theory
Seminar "Topologie", Universität Bonn, October 2009
NotesString Connections and Chern-Simons 2-Gerbes
Workshop "Strings, Fields and Topology", Mathematisches Forschungsinstitut Oberwolfach, June 2009
NotesSmooth Functors for higher-dimensional Parallel Transport
Workshop "Smooth Structures in Logic, Category Theory and Physics", Ottawa University, May 2009
Notes
Talks in 2008
Transport Functors and Connections on Gerbes
Seminar "Topology", University of California at Berkeley, August 2008
Notes Part 1 Notes Part 2Geometry for 2-Form Gauge Fields
Conference "Tagung des Sonderforschungsbereichs Particles, Strings and the Early Universe", Deutsches Elektronen-Synchrotron DESY Zeuthen, February 2008
Notes
Talks in 2007
Parallel Transport and Functors
Conference "Categories in Geometry and mathematical Physics", Mediterranean Institute For Life Sciences, September 2007
NotesParallel Transport Functors of Principal Bundles and (non-abelian) Bundle Gerbes
Conference "Principal Bundles, Gerbes and Stacks", VBAC-Meeting, Physikzentrum Bad Honnef, June 2007
Notes
Talks in 2006
Gerbes in unoriented WZW-Models
Summer school "Modern Mathematical Physics IV", University of Belgrade, September 2006
Notes
Talks in 2005
Introduction to Gerbes in Conformal Field Theory
Workshop "Gerbes, twisted K-theory and conformal field theory", Mathematisches Forschungsinstitut Oberwolfach, August 2005
NotesEinführung in die perturbative Quantisierung von Chern-Simons-Theorien
Seminar "Geometrische Aspekte der konformen Feldtheorie", Rerik, February 2005
Notes