il s'agit des phonons, qui sont des ondes sonores quantifiées ; pour le ferromagnétique on parle de magnons, qui sont des ondes de spin quantifiées. Dans tous les cas, il s'agit d'excitations de grande longueur d'onde ,
Dans notre expérience, de telles longueurs de cohérence sont atteintes, si bien qu'il serait envisageable de ,
undeuxì emeprobì eme plus sévère intervient, lui aussi lié aux collisions, etàetà l'extension du condensat selon x ,
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