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Upper and lower $L^2$-decay bounds for a class of derivative nonlinear Schr\"odinger equations

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arxiv 2204.07320 v1 pith:EDGZEZRA submitted 2022-04-15 math.AP

classification math.AP
keywords decayderivativeequationslowernonlinearodingerschrbounds
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abstract

We consider the initial value problem for cubic derivative nonlinear Schr\"odinger equations possessing weakly dissipative structure in one space dimension. We show that the small data solution decays like $O((\log t)^{-1/4})$ in $L^2$ as $t\to +\infty$. Furthermore, we find that this $L^2$-decay rate is optimal by giving a lower estimate of the same order.

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