Magnetic amplitudes for strings in a background 3-form H involve a 2-form potential B integrated on surfaces of arbitrary topology. We propose a random matrix model whose topological expansion lead to a discretized version of these amplitudes, in the case of a propagation on a finite space X quotiented by a finite group G. Besides the fluxes induced by B, they also involve topological defects on the surface, weighted by additional fields that are constructed using the group cohomology of G.
De Maïté Dupuis
De Johannes Thürigen
De Antônio Duarte Pereira
De Sumati Surya
De Riccardo Martini
De Raimar Wulkenhaar
De Valentin Bonzom
De Gaëtan Borot
De Timothy Budd
De Jan Ambjorn
De Laurent Baulieu
De François David
De Reiko Toriumi
De Thomas Krajewski
De Simone Speziale
De Albert Schwarz
De Marc Levine
De Claudio Dappiaggi
