The trace anomaly effective action reproduces Einstein-Gauss-Bonnet Friedmann equations and perturbation spectra on FRW backgrounds with a specific scalar field solution.
The four-dimensionality of space and the einstein tensor,
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On the analogue of Einstein-Gauss-Bonnet theory in 3+1 dimensions
The trace anomaly effective action reproduces Einstein-Gauss-Bonnet Friedmann equations and perturbation spectra on FRW backgrounds with a specific scalar field solution.