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We investigate the Two-Higgs-Doublet-Standard Model-Axion-Seesaw-Higgs-Portalinflation (2hdSMASH) model consisting of two Higgs doublets, a Standard Model(SM) singlet complex scalar and three SM singlet right-handed Majorananeutrinos that can address the strong CP problem, dark matter, neutrino masses,baryogenesis and inflation. We identify inflationary directions consistent withsuccessful inflation and theoretical constraints including perturbativeunitarity, boundedness-from-below conditions and high scale validity upto thePLANCK scale. Further, we present representative benchmark points satisfyingtheoretical and experimental constraints potentially accessible at futurecolliders.

Connecting Inflation and Low Energy Phenomenology in an Extended Two-Higgs-Doublet-Model