Two talks that I have given:
Obstruction theory for parameterized higher WZW terms
talk at AMS/EMS meeting 2015 in Porto, June 9-13
special session Higher Dimensional Algebra in Geometry and Quantum Field Theory
Obstruction theory for parameterized higher WZW terms
talk at German Mathematical Society meeting 2015 in Hamburg, September 21-25
section 1: Algebra und Zahlentheorie
on parameterized WZW models and, more generally, the globalization of ∞-Wess-Zumino-Witten theory from higher Klein geometries to higher Cartan geometry; specifically applied to globalization of the Green-Schwarz sigma-models of the brane bouquet from extended super Minkowski spacetimes to general curved supergravity backgrounds.
(Using the theory of differential cohomology in a cohesive topos, based on results in Higher geometric prequantum theory.)
All details are in
Course notes are at
We compute obstructions to globalizing WZW terms on Klein geometries to global WZW terms on Cartan geometries locally modeled on . We do this in the generality of higher degree WZW terms on higher orbispaces (i.e. in higher differential geometry on higher cohesive stacks). As a first example, the Green-Schwarz anomaly cancellation (String structure) is recovered as the obstruction to parameterization of the traditional WZW-term on the group ; similarly Fivebrane structure is found to lift the obstruction to parameterization of the 6-dimensional WZW term on the group stack ; and Ninebrane structure is found for parameterization of the 10-dimensional WZW term on the group 5-stack . We then obtain obstructions to globalizing the full -symmetry WZW terms (not just their curvature/flux forms) of all the super p-brane sigma models from extended super Minkowski spacetimes to curved supergravity backgrounds. These obstructions are generally higher and super analogs of symplectic-, quaternionic-Kähler-, - and -manifold structures, namely they are infinitesimally integrable higher G-structures for the higher Heisenberg supergroup stack of the given higher WZW term. For the case of the M5-brane with its tensor multiplet fields, already the model space is a higher super-3-stack extension of the 11-dimensional super-Poincaré group, and for phenomenologically realistic models the Cartan geometry is furthermore an orbifold modeled on this super 3-stack; while the globalization obstruction is the existence of a certain super-6-group -structure on that higher orbifold. So the generality of higher differential cohesive geometry is inevitable. We find in this case a forgetful -functor from definite globalizations of the M5-brane WZW term to solutions of the Einstein equations of motion of 11-dimensional supergravity.
differential cohomology in a cohesive topos
Obstruction theory for parameterized higher WZW terms
Last revised on March 22, 2017 at 09:25:33. See the history of this page for a list of all contributions to it.