For power-law f(G) gravity, the matter power spectrum computed from 1+3 covariant perturbations is not scale invariant, with curves decaying and then rising above the GR flat line as k grows.
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Matter power spectrum in a power-law $f(G)$ gravity
For power-law f(G) gravity, the matter power spectrum computed from 1+3 covariant perturbations is not scale invariant, with curves decaying and then rising above the GR flat line as k grows.