Physics – Mathematical Physics
Scientific paper
2011-11-27
Physics
Mathematical Physics
44 pages, AMS Latex
Scientific paper
We derive the defocusing cubic Gross-Pitaevskii (GP) hierarchy in dimensions $d=2,3$, from an $N$-body Schr\"{o}dinger equation describing a gas of interacting bosons in the GP scaling, in the limit $N\rightarrow\infty$. The main result of this paper is the proof of convergence of the corresponding BBGKY hierarchy to a GP hierarchy in the spaces introduced in our previous work on the well-posedness of the Cauchy problem for GP hierarchies, \cite{chpa2,chpa3,chpa4}, which are inspired by the solutions spaces based on space-time norms introduced by Klainerman and Machedon in \cite{klma}. We note that in $d=3$, this has been a well-known open problem in the field. While our results do not assume factorization of the solutions, consideration of factorized solutions yields a new derivation of the cubic, defocusing nonlinear Schr\"odinger equation (NLS) in $d=2,3$.
Chen Thomas
Pavlović Nataša
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