76.
We derive the defocusing cubic Gross–Pitaevskii (GP) hierarchy in dimension
d = 3, from an
N-body Schrödinger equation describing a gas of interacting bosons in the GP scaling, in the limit
N → ∞. 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 (Chen and Pavlovi? in Discr Contin Dyn Syst 27(2):715–739,
2010;
http://arxiv.org/abs/0906.2984; Proc Am Math Soc 141:279–293,
2013), which are inspired by the solution spaces based on space-time norms introduced by Klainerman and Machedon (Comm Math Phys 279(1):169–185,
2008). 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 Schrödinger equation (NLS) in
d = 3.
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