Pseudo-Nambu-Goldstone inflation with twin waterfalls

We propose a pseudo-Nambu-Goldstone inflation where twin waterfall fields coupled to the inflaton are responsible for graceful exit from by transition. In this scenario, $Z_2$ symmetry and protects potential against dangerous quantum corrections coming couplings. show that there is wide range of natural model parameters initial conditions successful discuss reheating process perturbative decay field with invariant Higgs portal. also present microscopic couplings in context dark QCD light heavy quarks.