Quench-induced collective excitations in trapped 2D BECs show hydrodynamic behavior at low energies due to broken scale invariance and acoustic modes at high energies.
Griffin,Excitations in a Bose-condensed Liquid, Cambridge Studies in Low Temperature Physics (Cambridge University Press, 1993)
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Quench induced collective excitations: from breathing to acoustic modes
Quench-induced collective excitations in trapped 2D BECs show hydrodynamic behavior at low energies due to broken scale invariance and acoustic modes at high energies.