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- W3206529052 abstract "We evaluate the Hadamard function and the vacuum expectation values (VEVs) of the field squared and energy-momentum tensor for a massless conformally coupled scalar field in $(D+1)$-dimensional de Sitter (dS) spacetime foliated by spatial sections of negative constant curvature. It is assumed that the field is prepared in the hyperbolic vacuum state. An integral representation for the difference of the Hadamard functions corresponding to the hyperbolic and Bunch-Davies vacua is provided that is well adapted for the evaluation of the expectation values in the coincidence limit. It is shown that the Bunch-Davies state is interpreted as thermal with respect to the hyperbolic vacuum. An expression for the corresponding density of states is provided. The relations obtained for the difference in the VEVs for the Bunch-Davies and hyperbolic vacua are compared with the corresponding relations for the Fulling-Rindler and Minkowski vacua in flat spacetime. The similarity between those relations is explained by the conformal connection of dS spacetime with hyperbolic foliation and Rindler spacetime. As a limiting case, the VEVs for the conformal vacuum in the Milne universe are discussed." @default.
- W3206529052 created "2021-10-25" @default.
- W3206529052 creator A5028625789 @default.
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- W3206529052 date "2022-02-01" @default.
- W3206529052 modified "2023-09-29" @default.
- W3206529052 title "Mean field squared and energy–momentum tensor for the hyperbolic vacuum in dS spacetime" @default.
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- W3206529052 doi "https://doi.org/10.1016/j.aop.2021.168728" @default.
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