A note on 2D focusing many-boson systems

A note on 2D focusing many-boson systems
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关于二维聚焦多玻色子系统的注释

DOI:
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发表时间:
2015
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通讯作者:
N. Rougerie
N. Rougerie
中科院分区:
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文献类型:
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作者:
Mathieu Lewin;P. T. Nam;N. Rougerie

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本文考虑了一个N玻色子的二维量子系统,|X| ^s$,通过形式为$N^{2η-1} w(Nη x)$。我们证明,对于所有0美元 extless{} eta extless{}(s+1)/(s+2)$,在大N$极限下,用相应的立方非线性Schr{o}dinger能量泛函描述了多体系统基态的首阶行为.我们的结果涵盖了聚焦的情况下($w leq 0$),甚至多体系统的稳定性是不明显的。这回答了X提到的一个开放性问题。Chen和J.~ Holmer的谐波陷阱($s=2$)。结合BBGKY层次方法,我们的结果表明,对于所有的$0,多体量子动力学收敛到具有谐波陷阱的聚焦NLS方程 extless{} eta extless{} 3/4$。
We consider a 2D quantum system of $N$ bosons in a trapping potential $|x|^s$, interacting via a pair potential of the form $N^{2eta-1} w(N^eta x)$. We show that for all $0 extless{} eta extless{} (s+1)/(s+2)$, the leading order behavior of ground states of the many-body system is described in the large $N$ limit by the corresponding cubic nonlinear Schr{o}dinger energy functional. Our result covers the focusing case ($w leq 0$) where even the stability of the many-body system is not obvious. This answers an open question mentioned by X.~Chen and J.~Holmer for harmonic traps ($s=2$). Together with the BBGKY hierarchy approach used by these authors, our result implies the convergence of the many-body quantum dynamics to the focusing NLS equation with harmonic trap for all $0 extless{} eta extless{} 3/4$.