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arXiv 0905.3105math.APmath-phmath.MP
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L^2-临界玻色子星方程基态的唯一性

Uniqueness of ground states for the L^2-critical boson star equation

Rupert L. Frank, Enno Lenzmann

摘要:

在$\R^3$中建立了$L^2$ -临界玻色子星方程$\sqrt{-Δ} u - (|x|^{-1} \ast |u|^2) u = -u$基态$u(x) \geq 0$的唯一性.证明混合变分参数与调和扩展到半空间$\R^4_+$。除了唯一性,我们还显示了基态的径向(平移)和线性化的非简并性。我们的结果为含时$L^2$ -临界玻色子星方程的爆破分析提供了不可缺少的基础。唯一性证明可以推广到不同的分数拉普拉斯算子$(-Δ)^s$和空间维数。

英文摘要:

We establish uniqueness of ground states $u(x) \geq 0$ for the $L^2$-critical boson star equation $\sqrt{-Δ} u - (|x|^{-1} \ast |u|^2) u = -u$ in $\R^3$. The proof blends variational arguments with the harmonic extension to the halfspace $\R^4_+$. Apart from uniqueness, we also show radiality of ground states (up to translations) and the nondegeneracy of the linearization. Our results provide an indispensable basis for the blowup analysis of the time-dependent $L^2$-critical boson star equation. The uniqueness proof can be generalized to different fractional Laplacians $(-Δ)^s$ and space dimensions.

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