il seraitégalementseraitégalement intéressant de faire le lien avec des travaux théoriques qui ont traité de l'amortissement des phonons dans un potentiel aléatoire de faible amplitude ,
Einstein Nous rappelons ici, d'une part, la valeur de la vitesse du son dans un condensat de Bose- Einstein gazeuxàgazeuxà partir de la description hydrodynamique de celui-ci, et, d'autre part ,
(r) = µ ? V ext (r) L'´ equation précédente (5.15) est analoguè a l'´ equation de propagation d'une onde sonorè a la vitesse c(r) Ainsi elle définit une vitesse du son locale, c(r), dans le nuage atomique qui dépend de la position r. Les solutions de l'´ equation (5.15) dans le cas d'un système homogène (V ext = 0) sont des ondes sonores se propageantàpropageant`propageantà la vitesse c son = µ/m = gn 0 /m [133] ,
u cette condition n'est pas respectée l'´ equation de propagation linéarisée n'est pas valide. La présence d'interactions est ainsi nécessaire dans la description hydrodynamique du propageant sous la forme d ,
que la vitesse de propagation d'une onde sonore sous forme d'un pic de densité dans un condensat avec interactions fortes soit plus rapide que la vitesse déterminée par l'´ equation (5.16) Les barres d'erreur sur nos mesures expérimentales ne permettent pas de mettre enévidenceenévidence unécartàunécartunécart`unécartà l'´ equation (5.16). Cetté equation décrit très bien la propagation d'ondes sonores dans nos condensats allongés ,
Ketterle [20], une déviation entre les mesures et l'´ equation (5.16) a ´ eté observée aux faibles densités. CetécartCetécart est attribuéattribuéà la technique utilisée pour travailler avec de faibles densités atomiques qui consistè a ouvrir le pì ege radial. En effet, dans ce cas ,
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