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- W2040668538 abstract "Physical situations involving multiplicative noise arise generically in cosmology and field theory. In this paper, the focus is first on exact nonlinear Langevin equations, appropriate in a cosmologica setting, for a system with one degree of freedom. The Langevin equations are derived using an appropriate time-dependent generalization of a model due to Zwanzig. These models are then extended to field theories and the generation of multiplicative noise in such a context is discussed. Important issues in both the cosmological and field theoretic cases are the fluctuation-dissipation relations and the relaxation time scale. Of some importance in cosmology is the fact that multiplicative noise can substantially reduce the relaxation time. In the field theoretic context such a noise can lead to a significant enhancement in the nucleation rate of topological defects." @default.
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- W2040668538 date "1993-12-01" @default.
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- W2040668538 title "Multiplicative Noise: Applications in Cosmology and Field Theory" @default.
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- W2040668538 doi "https://doi.org/10.1111/j.1749-6632.1993.tb24685.x" @default.
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