The boundary is mixed

Abstract : We show that Oeckl's boundary formalism incorporates quantum statistical mechanics naturally, and we formulate general-covariant quantum statistical mechanics in this language. We illustrate the formalism by showing how it accounts for the Unruh effect. We observe that the distinction between pure and mixed states weakens in the general covariant context, and surmise that local gravitational processes are indivisibly statistical with no possible quantal versus probabilistic distinction.
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Eugenio Bianchi, Hal M. Haggard, Carlo Rovelli. The boundary is mixed. General Relativity and Gravitation, Springer Verlag, 2017, 49 (8), pp.100. ⟨10.1007/s10714-017-2263-2⟩. ⟨hal-00845520⟩

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