Symmetry-breaking inflation in non-minimal metric-affine gravity
Abstract
We study symmetry-breaking inflation within the framework of metric-affine gravity. By introducing a non-minimal coupling, β(φ) R, between the Holst invariant and the inflaton, both small-field and large-field inflationary predictions can be brought into agreement with the latest observational constraints. Remarkably, even for sub-Planckian vacuum expectation values, appropriately chosen values of β(φ) enable viable inflation, a scenario previously considered unattainable.
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