Entanglement of Coarse Grained Quantum Field in the Expanding Universe - General Relativity and Quantum CosmologyReportar como inadecuado




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Abstract: We investigate the entanglement of a quantum field in the expanding universe.By introducing a bipartite system using a coarse-grained scalar field, we applythe separability criterion based on the partial transpose operation andnumerically calculate the bipartite entanglement between separate spatialregions. We find that the initial entangled state becomes separable ordis-entangled after the spatial separation of two points exceed the Hubblehorizon. This provides the necessary condition for the appearance ofclassicality of the quantum fluctuation. We also investigate the condition ofclassicality that the quantum field can be treated as the classical stochasticvariables.



Autor: Yasusada Nambu, Yuji Ohsumi

Fuente: https://arxiv.org/







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