Renormalizability of alternative theories of gravity: differences between power counting and entropy argument

Abstract

It is well known that General Relativity cannot be considered under the standard of a perturbatively renormalizable quantum field theory, but asymptotic safety is taken into account as a possibility for the formulation of gravity as a non-perturbative renormalizable theory. Recently, the entropy argument has however stepped into the discussion claiming for a "no-go" to the asymptotic safety argument. In this paper, we present simple counter-examples, considering alternative theories of gravity, to the entropy argument as further indications, among others, on the possible flows in the assumptions on which the latter is based on. We consider different theories, namely curvature based extensions of General Relativity as $f(R)$, $f(\mathcal{G})$, extensions of Teleparallel Gravity as $f(T)$, and Horava-Lifshitz gravity, working out the explicit spherically symmetric solutions in order to make a comparison between power counting and the entropy argument. Even in these cases, inconsistencies are found.

arXiv comment13 pages. Accepted for publication in "Universe"

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• Generalized uncertainty principle corrections in Rastall-Rainbow Casimir wormholes
• Minisuperspace quantum cosmology in $f(Q)$ gravity
• The Noether Symmetry Approach: Foundation and applications. The case of scalar-tensor Gauss-Bonnet gravity
• The Horava-Lifshitz Modifications of the Casimir effect at finite temperature revisted
• Linearized Field Equations and Extra Force in $f(R,{\mathbf{T}}^{(n)})$ Extended Gravity
• Scalar-Field Reconstruction of Ricci--Gauss--Bonnet Dark Energy in Hořava--Lifshitz Cosmology
• Global dynamics of the Horava-Lifshitz cosmological model in a non-flat universe with non-zero cosmological constant