Daan Janssen (York, UK)
For gauge field theories on spacetimes with (asymptotic) boundaries, the gauge transformations acting non-trivially at boundaries and/or corners have a distinguished role compared to those acting purely in the bulk, where the latter are viewed as redundancies, the former play an important role in boundary/infrared features of these theories. We investigate the quantum electromagnetic field on spacetimes with boundaries and corners, and construct algebras of semi-local observables sensitive to the boundary gauge group. We discuss the role of these observables in gluing procedures and superselection theory for electromagnetism, as well as the existence of physically well behaved (Hadamard) states on these algebras.
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