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de Sitter Radiation and Backreaction in Quantum Cosmology
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de Sitter Radiation and Backreaction in Quantum Cosmology
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We explore the quantum cosmology description of the de Sitter (dS) radiation and its backreaction to dS space, inherent in the wave function of the Wheeler-DeWitt equation for pure gravity with a cosmological constant. We first investigate the quantum Friedmann-Lemaitre-Robertson-Walker cosmological model and then consider possible effects of inhomogeneities of the universe on the dS radiation. In both the cases we obtain the modified Friedmann equation, including the backreaction from spacetime fluctuations, and the quantum-corrected dS temperature. It is shown that the quantum correction increases the dS temperature with the increment characterized by the ratio of the dS scale to the Planck scale.
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