Large deviations for small noise diffusions over long time
Large deviations for small noise diffusions over long time
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长时间内小噪声扩散的大偏差
DOI:
10.1090/btran/172
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发表时间:
2024
期刊:
影响因子:
--
通讯作者:
Zoubouloglou, Pavlos
中科院分区:
文献类型:
--
作者:
Budhiraja, Amarjit;Zoubouloglou, Pavlos
We study two problems. First, we consider the large deviation behavior of empirical measures of certain diffusion processes as, simultaneously, the time horizon becomes large and noise becomes vanishingly small. The law of large numbers (LLN) of the empirical measure in this asymptotic regime is given by the unique equilibrium of the noiseless dynamics. Due to degeneracy of the noise in the limit, the methods of Donsker and Varadhan [Comm. Pure Appl. Math. 29 (1976), pp. 389–461] are not directly applicable and new ideas are needed. Second, we study a system of slow-fast diffusions where both the slow and the fast components have vanishing noise on their natural time scales. This time the LLN is governed by a degenerate averaging principle in which local equilibria of the noiseless system obtained from the fast dynamics describe the asymptotic evolution of the slow component. We establish a large deviation principle that describes probabilities of divergence from this behavior. On the one hand our methods require stronger assumptions than the nondegenerate settings, while on the other hand the rate functions take simple and explicit forms that have striking differences from their nondegenerate counterparts. References
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1990
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