Abstract
The evolution of some vacuum spatially-flat Robertson-Walker universes filled with a massless conformally-invariant quantum field is presented in the energy density-curvature phase plane.
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References
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Woszczyna, A. Robertson-Walker cosmologies with a trace anomaly effect in their dynamical description. Astrophys Space Sci 90, 75–78 (1983). https://doi.org/10.1007/BF00651549
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DOI: https://doi.org/10.1007/BF00651549