82 citations · 526 across the 39 of their papers we have counts for
7 papers · 1 filter
Non-abelian gerbes and some applications in string theory
Christoph Schweigert, Konrad Waldorf
We review a systematic construction of the 2-stack of bundle gerbes via descent, and extend it to non-abelian gerbes. We review the role of non-abelian gerbes in orientifold sigma…
The gauging of two-dimensional bosonic sigma models on world-sheets with defects
Krzysztof Gawedzki, Rafal R. Suszek, Konrad Waldorf
We extend our analysis of the gauging of rigid symmetries in bosonic two-dimensional sigma models with Wess-Zumino terms in the action to the case of world-sheets with defects. A s…
Global gauge anomalies in two-dimensional bosonic sigma models
Krzysztof Gawedzki, Rafal R. Suszek, Konrad Waldorf
We revisit the gauging of rigid symmetries in two-dimensional bosonic sigma models with a Wess-Zumino term in the action. Such a term is related to a background closed 3-form H on…
Polyakov-Wiegmann Formula and Multiplicative Gerbes
Krzysztof Gawedzki, Konrad Waldorf
An unambiguous definition of Feynman amplitudes in the Wess-Zumino-Witten sigma model and the Chern-Simon gauge theory with a general Lie group is determined by a certain geometric…
Bi-branes: Target Space Geometry for World Sheet topological Defects
Jürgen Fuchs, Christoph Schweigert, Konrad Waldorf
We establish that the relevant geometric data for the target space description of world sheet topological defects are submanifolds - which we call bi-branes - in the product M1 x M…
WZW orientifolds and finite group cohomology
Krzysztof Gawedzki, Rafal R. Suszek, Konrad Waldorf
The simplest orientifolds of the WZW models are obtained by gauging a Z_2 symmetry group generated by a combined involution of the target Lie group G and of the worldsheet. The act…