Theory for a Hanbury Brown Twiss experiment with a ballistically expanding cloud of cold atoms
Jose Viana Gomes, Aurélien Perrin, Martijn Schellekens, Denis Boiron, Christoph I. Westbrook, Michael Belsley
Abstract
We have studied one-body and two-body correlation functions in a ballistically expanding, non-interacting atomic cloud in the presence of gravity. We find that the correlation functions are equivalent to those at thermal equilibrium in the trap with an appropriate rescaling of the coordinates. We derive simple expressions for the correlation lengths and give some physical interpretations. Finally a simple model to take into account finite detector resolution is discussed.
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