Quintessential Inflation with Dynamical Higgs Generation as an Affine Gravity

Abstract

First, we propose a scale-invariant modified gravity interacting with a neutral scalar inflaton and a Higgs-like 
 
 
 
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 iso-doublet scalar field based on the formalism of non-Riemannian (metric-independent) spacetime volume-elements. This model describes, in the physical Einstein frame, a quintessential inflationary scenario driven by the “inflaton” together with the gravity-“inflaton” assisted dynamical spontaneous 
 
 
 
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 symmetry breaking in the post-inflationary universe, whereas the 
 
 
 
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 symmetry remains intact in the inflationary epoch. Next, we find the explicit representation of the latter quintessential inflationary model with a dynamical Higgs effect as an Eddington-type purely affine gravity.