Symmetry-breaking inflation in non-minimal metric-affine gravity

2024/12/23 by Gialamas, Ioannis D., Racioppi, Antonio · 6 citations
#Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.2412.17738

Abstract

We study symmetry-breaking inflation within the framework of metric-affine gravity. By introducing a non-minimal coupling, β(ϕ)\cal 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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