Nonminimal couplings and preheating effects in $R^2$-Higgs inflation after ACT and SPT

Haneesh Gonuguntla, Tanmoy Modak, Arnab Samanta

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 ob…