Hadamard States from Light-like Hypersurfaces by Claudio Dappiaggi, Valter Moretti, Nicola Pinamonti.
This book provides a rather self-contained survey of the construction of Hadamard states for scalar field theories in a large class of notable spacetimes, possessing a (conformal) light-like boundary. The first two sections focus on explaining a few introductory aspects of this topic and on providin...
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