Preprint
Sep 2026
On-shell Homogeneous Curvature Modes in Quadratic $F(R,\mathcal G)$ Cosmology
5We study homogeneous cosmological perturbations in the quadratic model $F(R,\mathcal G)=R+\alpha R^2+\beta\mathcal G^2$. Linearization of the modified Friedmann equation together with dust conservation yields a second-order equation for the homogeneous Hubble perturbation, or equivalently a third-order equation for th...
F. Tello-Ortiz, B.Mishra, Y. Gómez-Leyton et al.
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