Affiliations: Centre de Mathématiques Appliquées, CNRS et Ecole Polytechnique, 91128 Palaiseau cedex, France. E-mail: debouard@cmapx.polytechnique.fr | Division of Mathematics, Graduate School of Information Sciences, Tohoku University, Sendai, 980-8579, Japan. E-mail: fukuizumi@math.is.tohoku.ac.jp
Abstract: We study the asymptotic behavior of the solution of a model equation for Bose–Einstein condensation, in the case where the trapping potential varies randomly in time. The model is the so called Gross–Pitaevskii equation, with a quadratic potential with white noise fluctuations in time whose amplitude ε tends to zero. The initial condition of the solution is a standing wave solution of the unperturbed equation. We prove that up to times of the order of ε−2, the solution decomposes into the sum of a randomly modulated standing wave and a small remainder, and we derive the equations for the modulation parameters. In addition, we show that the first order of the remainder, as ε goes to zero, converges to a Gaussian process, whose expected mode amplitudes concentrate on the third eigenmode generated by the Hermite functions, on a certain time scale.
