## Talks in 2023

*The 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

Presentation*A representation of the string 2-group*

TQFT Club Seminar, online, November 2022

Video*Geometric T-Duality: Buscher rules in general topology*

Program "Higher Structures and Field Theory", Erwin-Schrödinger-Institut für Mathematische Physik, August 2022

Video*Diffeology 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 Video*2-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

Notes*Stacks, 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

Video*Non-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

Notes*Transgressive 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 Video*Loop 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

Presentation*Lectures on gerbes, loop spaces, and Chern-Simons theory*

Workshop "Chern-Simons Theory: Geometry, Topology and Physics", University of Pittsburgh, May 2013

Notes*Lectures 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

Notes*Geometric string structures and supersymmetric sigma models*

Workshop "Higher Gauge Theory, TQFTs, and Categorification", Cardiff University, May 2011

Notes*Abelian 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

Notes*Transgression of Gerbes to Loop Spaces*

Workshop "Higher Structures in Topology and Geometry IV", Georg-August-Universität Göttingen, June 2010

Notes*Chern-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

Notes*Multiplicative Gerbes and Chern-Simons Theory*

Seminar "Topologie", Universität Bonn, October 2009

Notes*String Connections and Chern-Simons 2-Gerbes*

Workshop "Strings, Fields and Topology", Mathematisches Forschungsinstitut Oberwolfach, June 2009

Notes*Smooth 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 2*Geometry 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

Notes*Parallel 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

Notes*Einführung in die perturbative Quantisierung von Chern-Simons-Theorien*

Seminar "Geometrische Aspekte der konformen Feldtheorie", Rerik, February 2005

Notes