General Einstein-Cartan quadratic gravity with derivative couplings

Abstract

Within the framework of Einstein-Cartan gravity we consider an action, containing up to quadratic terms of the Ricci scalar and the Holst invariant, coupled non-minimally to a scalar field, including couplings of its derivatives to curvature. We derive the equivalent metric theory, featuring an extra dynamical pseudoscalar degree of freedom associated with the presence of the Holst term in the action. We study the evolution of the resulting two-field system in a FRW background and show that it evolves rapidly into an effective single-field inflationary model. We find that the model is consistent with the latest observational data for a wide range of its parameters, determining the necessary upper limits on derivative coupling parameters.

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Cited by in corpus (7)

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• Inflationary Models with Gauss-Bonnet Coupling in Light of ACT Observations
• Quantum-Corrected ${\varphi }^4$ Inflation in Light of ACT Observations
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