= M. R. Andrews
{c}
{tag=Physicist}
An experimental <physicist> who coauthored a 1997 measurement of <sound> propagation in a <Bose-Einstein condensate>. A focused <laser> beam suddenly changed the trapping potential, launching localized density disturbances. Rapid nondestructive images followed their motion and measured the <speed of sound> as a function of density, testing the collective excitations predicted by <Bogoliubov theory>.<Propagation of Sound in a Bose-Einstein Condensate by M. R. Andrews and others>[Abstract, Physical Review Letters 79, 553–556: optical excitation and phase-contrast image sequences]{ref}
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