In this paper we propose two simple minimal Higgs inflation scenarios through a simple modification of the Higgs potential , as opposed to the usual non-minimal Higgs-gravity coupling prescription .
The modification is done in such a way that it creates a flat plateau for a huge range of field values at the inflationary energy scale \mu \simeq ( \lambda ) ^ { 1 / 4 } \alpha .
Assuming the perturbative Higgs quartic coupling , \lambda \simeq { \cal O } ( 1 ) , for both the models inflation energy scale turned out to be \mu \simeq ( 10 ^ { 14 } , 10 ^ { 15 } ) GeV , and prediction of all the cosmologically relevant quantities , ( n _ { s } ,r,dn _ { s } ^ { k } ) , fit extremely well with observations made by PLANCK .
Considering observed central value of the scalar spectral index , n _ { s } = 0.968 , our two models predict efolding number , N = ( 52 , 47 ) .
Within a wide range of viable parameter space , we found that the prediction of tensor to scalar ratio r ( \leq 10 ^ { -5 } ) is far below the current experimental sensitivity to be observed in the near future .
The prediction for the running of scalar spectral index , dn _ { s } ^ { k } , approximately remains the same as was predicted by the usual chaotic and quartic inflation scenario .
We also the computed the background field dependent unitarity scale \Lambda ( h ) , which turned out to be much larger than the aforementioned inflationary energy .