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- W3103440064 abstract "We study Maxwell’s equation as a theory for smooth k-forms on globally hyperbolic spacetimes with timelike boundary as defined by Aké et al. (Structure of globally hyperbolic spacetimes with timelike boundary. arXiv:1808.04412 [gr-qc]). In particular, we start by investigating on these backgrounds the D’Alembert–de Rham wave operator $$Box _k$$ and we highlight the boundary conditions which yield a Green’s formula for $$Box _k$$ . Subsequently, we characterize the space of solutions of the associated initial and boundary value problems under the assumption that advanced and retarded Green operators do exist. This hypothesis is proven to be verified by a large class of boundary conditions using the method of boundary triples and under the additional assumption that the underlying spacetime is ultrastatic. Subsequently we focus on the Maxwell operator. First we construct the boundary conditions which entail a Green’s formula for such operator and then we highlight two distinguished cases, dubbed $$delta mathrm {d}$$ -tangential and $$delta mathrm {d}$$ -normal boundary conditions. Associated to these, we introduce two different notions of gauge equivalence and we prove that in both cases, every equivalence class admits a representative abiding to the Lorenz gauge. We use this property and the analysis of the operator $$Box _k$$ to construct and to classify the space of gauge equivalence classes of solutions of the Maxwell’s equations with the prescribed boundary conditions. As a last step and in the spirit of future applications in the framework of algebraic quantum field theory, we construct the associated unital $$*$$ -algebras of observables proving in particular that, as in the case of the Maxwell operator on globally hyperbolic spacetimes with empty boundary, they possess a non-trivial center." @default.
- W3103440064 created "2020-11-23" @default.
- W3103440064 creator A5041577591 @default.
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- W3103440064 date "2020-06-10" @default.
- W3103440064 modified "2023-10-16" @default.
- W3103440064 title "On Maxwell’s Equations on Globally Hyperbolic Spacetimes with Timelike Boundary" @default.
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- W3103440064 doi "https://doi.org/10.1007/s00023-020-00929-x" @default.
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