A note on 2D focusing many-boson systems
A note on 2D focusing many-boson systems
复制标题
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
期刊:
影响因子:
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通讯作者:
N. Rougerie
中科院分区:
文献类型:
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作者:
Mathieu Lewin;P. T. Nam;N. Rougerie
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 $0 extless{} eta extless{} 3/4$.