We study the time-evolution of initially trapped Bose–Einstein condensates in
the Gross–Pitaevskii regime. We show that condensation is preserved by
the many-body evolution and that the dynamics of the condensate wave
function can be described by the time-dependent Gross–Pitaevskii equation.
With respect to previous works, we provide optimal bounds on the rate
of condensation (i.e., on the number of excitations of the Bose–Einstein
condensate). To reach this goal, we combine the method of Lewin, Nam and
Schlein (2015), who analyzed fluctuations around the Hartree dynamics for
-particle
initial data in the mean-field regime, with ideas of Benedikter, de Oliveira and
Schlein (2015), who considered the evolution of Fock-space initial data in the
Gross–Pitaevskii regime.
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