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Nonminimal couplings and preheating effects in $R^2$-Higgs inflation after ACT and SPT data
cosmology-and-nongalactic-astrophysicsgeneral-relativity-and-quantum-cosmologyhigh-energy-physics-phenomenology
We study the effects of dimension-four and dimension-six nonminimal Higgs couplings to the Ricci scalar $R$ in the $R^2$-Higgs inflation model in light of the recent ACT and SPT observations. We show that the dimension-six operators $|Φ|^2 R^2$ and $|Φ|^4 R$ can accommodate the enhanced scalar spect
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