A modification of the optimal fluctuation approach is applied to study the tails of the free-energy distribution function PL(F) for an elastic string in quenched disorder both in the regions of the universal behavior of PL(F) and in the regions of large fluctuations, where the behavior of PL(F) is nonuniversal. The difference between the two regimes is shown to consist in whether it is necessary or not to take into account the renormalization of parameters by the fluctuations of disorder in the vicinity of the optimal fluctuation.
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Kolokolov et al. (2007) studied this question.
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