Renormalized solutions for stochastic transport equations and the regularization by bilinear multiplicative noise

Details Renormalized solutions for stochastic transport equations and the regularization by bilinear multiplicative noise Renormalized solutions for stochastic transport equations and the regularization by bilinear multiplicative noise

2010-07-23

arxiv.org/abs/1007.4102v1

Mathematics

Probability

Scientific paper

A linear stochastic transport equation with non-regular coefficients is considered. Under the same assumption of the deterministic theory, all weak $L^\infty$-solutions are renormalized. But then, if the noise is nondegenerate, uniqueness of weak $L^\infty$-solutions does not require essential new assumptions, opposite to the deterministic case where for instance the divergence of the drift is asked to be bounded. The proof gives a new explanation why bilinear multiplicative noise may have a regularizing effect.

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