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The effect of a uniform flow field on one-dimensional localized acoustical excitations is investigated by use of both the usual Feynman diagrammatic perturbation theory and the Berezinskii formalism. While leading-order perturbation theory suggests that localization is destroyed by a flow, or at least drastically modified, the Berezinskii method proves that localization suffers no essential modifications. The reason for the breakdown of the usual perturbative approach is discussed.
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Condat et al. (1987) studied this question.
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