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arXiv · 2007.06452

Time integrable weighted dispersive estimates for the fourth order Schrödinger equation in three dimensions

Michael Goldberg·William R. Green
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Abstract

We consider the fourth order Schrödinger operator $H=Δ^2+V$ and show that if there are no eigenvalues or resonances in the absolutely continuous spectrum of $H$ that the solution operator $e^{-itH}$ satisfies a large time integrable $|t|^{-\frac54}$ decay rate between weighted spaces. This bound improves what is possible for the free case in two directions; both better time decay and smaller spatial weights. In the case of a mild resonance at zero energy, we derive the operator-valued expansion $e^{-itH}P_{ac}(H)=t^{-\frac34} A_0+t^{-\frac54}A_1$ where $A_0:L^1\to L^\infty$ is an operator of rank at most four and $A_1$ maps between polynomially weighted spaces.

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Michael Goldberg, William R. Green. 2021-06-02. Time integrable weighted dispersive estimates for the fourth order Schrödinger equation in three dimensions. https://arxiv.org/abs/2007.06452

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