# Effective interactions in Ricci-Based Gravity models below the non-metricity scale

12 Jul 2019  ·  Adria Delhom, Victor Miralles, Ana Peñuelas ·

We show how minimally-coupled matter fields of arbitrary spin, when coupled to Ricci-Based Gravity theories, develop non-trivial effective interactions that can be treated perturbatively only below a characteristic high-energy scale $\Lambda_Q$. Our results generalize to arbitrary matter fields those recently obtained for spin 1/2 fields in \cite{Latorre:2017uve}... We then use this interactions to set bounds on the high-energy scale $\Lambda_Q$ that controls departures of Ricci-Based Gravity theories from General Relativity. Particularly, for Eddington-inspired Born-Infeld gravity we obtain the strong bound $|\kappa|<3.5 \times 10^{-14} \text{ m}^5 \text{kg}^{-1}\text{s}^{-2}$. read more

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High Energy Physics - Theory General Relativity and Quantum Cosmology High Energy Physics - Phenomenology