Bundle Gerbes for Orientifold Sigma Models
Krzysztof Gawedzki, Rafal R. Suszek, Konrad Waldorf

TL;DR
This paper explores the use of bundle gerbes and their modules in orientifold sigma models, extending their application to include open and closed strings with additional structures for flux contributions.
Contribution
It introduces new structures on bundle gerbes and modules specifically tailored for orientifold sigma models involving open and closed strings.
Findings
Extended bundle gerbe structures for orientifold models
Framework for holonomy calculations in orientifold backgrounds
Application to flux contributions in string amplitudes
Abstract
Bundle gerbes with connection and their modules play an important role in the theory of two-dimensional sigma models with a background Wess-Zumino flux: their holonomy determines the contribution of the flux to the Feynman amplitudes of classical fields. We discuss additional structures on bundle gerbes and gerbe modules needed in similar constructions for orientifold sigma models describing closed and open strings.
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