Global aspects of double geometry

Understand

We consider the concept of a generalised manifold in the O(d,d) setting, i.e., in double geometry.

• The conjecture by Hohm and Zwiebach for the form of finite generalised diffeomorphisms is shown to hold.
• Transition functions on overlaps are defined.
• Triple overlaps are trivial concerning their action on coordinates, but non-trivial on fields, including the generalised metric.