A combination of Ricci and inverse-Ricci scalars is constructed that gives regular FLRW background equations, reducing the linear model to general relativity with a shifted Hubble constant.
$f(R, R_{munu}^2)$ at one loop
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abstract
We compute the one-loop divergences in a theory of gravity with Lagrangian of the general form $f(R,R_{\mu\nu}R^{\mu\nu})$, on an Einstein background. We also establish that the one-loop effective action is invariant under a duality that consists of changing certain parameters in the relation between the metric and the quantum fluctuation field. Finally, we discuss the unimodular version of such a theory and establish its equivalence at one-loop order with the general case.
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The Regular Ricci-Inverse Cosmology with Multiple Anticurvature Scalars
A combination of Ricci and inverse-Ricci scalars is constructed that gives regular FLRW background equations, reducing the linear model to general relativity with a shifted Hubble constant.