A note on 2D focusing many-boson systems

Lewin, Mathieu; Nam, Phan; Rougerie, Nicolas

doi:10.1090/proc/13468

A note on 2D focusing many-boson systems
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by Mathieu Lewin, Phan Thành Nam and Nicolas Rougerie PDF

Proc. Amer. Math. Soc. 145 (2017), 2441-2454

Abstract:

We consider a 2D quantum system of $N$ bosons in a trapping potential $|x|^s$, interacting via a pair potential of the form $N^{2\beta -1} w(N^\beta x)$. We show that for all $0<\beta <(s+1)/(s+2)$, the leading order behavior of ground states of the many-body system is described in the large $N$ limit by the corresponding cubic nonlinear Schrödinger energy functional. Our result covers the focusing case ($w<0$) 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 $0<\beta <3/4$.

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