Large-Deviation Functions for Nonlinear Functionals of a Gaussian Stationary Markov Process

Abstract

We introduce a general method, based on a mapping onto quantum mechanics, for investigating the large-T limit of the distribution P(r,T) of the nonlinear functional r[V] = (1/T)\int_0^T dT' V[X(T')], where V(X) is an arbitrary function of the stationary Gaussian Markov process X(T). For T tending to infinity at fixed r we find that P(r,T) behaves as exp[-theta(r) T], where theta(r) is a large deviation function. We present explicit results for a number of special cases, including the case V(X) = X θ(X) which is related to the cooling and the heating degree days relevant to weather derivatives.

8 pages

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