Radiative corrections from spectator fields cause the inflaton to evolve as an exponential of N_e squared during slow-roll inflation, unlike linear friction approximations, while producing spectator particles whose total number grows exponentially with e-folds.
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What spectators do during inflation
Radiative corrections from spectator fields cause the inflaton to evolve as an exponential of N_e squared during slow-roll inflation, unlike linear friction approximations, while producing spectator particles whose total number grows exponentially with e-folds.