We prove that the uniform radius of spatial analyticity of solution at time to the one‐dimensional fourth‐order nonlinear Schrödinger equation cannot decay faster than for large , given that the initial data are analytic with fixed radius . The main ingredients in the proof are a modified Gevrey space, a method of approximate conservation law, and a Strichartz estimate for free wave associated with the equation.
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Getachew et al. (2024) studied this question.
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