Asymptotically Friedmann and Friedmann-type solutions to Einstein's equations when quantum effects due to conformally invariant fields are taken into account

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Vacuum polarization of quantum matter fields introduces higher-derivative terms and the conformal anomaly to Einstein's equations. We study their effects on cosmological solutions in a general Robertson-Walker metric, by expressing the relevant back-reaction equation as the equation of motion for a (anti-)dissipative system. In particular, we classify the solutions which can become candidates for our universe. They include not only asymptotically Friedmann solutions (singular or particular solutions) but also general solutions close to them and other Friedmann-type solutions, some of which undergo a de Sitter expansion in the early stage.

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