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We investigate the possibility of enhancement of effective axion decayconstant in well controlled constructions in string theory. To this end, westudy the dynamics of axions arising in the compactifications of type IIAstring theory on Calabi-Yau orientifolds with background fluxes (withnon-perturbative effects included to ensure stabilization of all moduli). Inthis setup, we attempt to obtain large effective axion decay constant in twodifferent ways: by searching for a direction in field space in which thepotential is sufficiently flat and by arriving at a very explicit stringyembedding of the Kim-Nilles-Peloso (KNP) alignment mechanism. We do not findsuper-Planckian effective decay constants by either of the approaches.Furthermore, we find that the alignment angle of KNP mechanism can not be madearbitrarily small by adjusting the fluxes.

Enhancement of axion decay constants in type IIA theory?