A generalized Nieh-Yan coupling in metric-affine gravity can restore the consistency of Palatini inflation with CMB observations and produce testable tensor-to-scalar ratios.
Cosmology for Grand Unified Theories with Radiatively Induced Symmetry Breaking,
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Inflation with Nieh-Yan-like terms in metric-affine gravity
A generalized Nieh-Yan coupling in metric-affine gravity can restore the consistency of Palatini inflation with CMB observations and produce testable tensor-to-scalar ratios.