A Holst-invariant coupling to the inflaton makes symmetry-breaking inflation viable, including the previously unattainable sub-Planckian vacuum expectation value case.
Sato, First Order Phase Transition of a Vacuum and Expansion of the Universe , Mon
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Symmetry-breaking inflation in non-minimal metric-affine gravity
A Holst-invariant coupling to the inflaton makes symmetry-breaking inflation viable, including the previously unattainable sub-Planckian vacuum expectation value case.