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[S0031-9007(98)05702-0] We predicted that density perturbations should propagate along the axis of a cigar-shaped Bose-Einstein cond at a speedc ­ sn0Ũymd, wheren0 is the density at the center of the cloud, Ũ characterizes the repulsive interaction between atoms, and m is their mass. This prediction was based on an incorrect use of an energy functional. We have since corrected our theoretical approach to reducing the three-dimensional sound propagation to a dimensional equation. We considered the quantum Lagrangian for a Bose-Einstein condensate [1] confined cylindrial tube which is infinite in thez direction. We assumed a Thomas-Fermi solution in the radial direction b using a trial wave function of the form

Erratum: Propagation of Sound in a Bose-Einstein Condensate [Phys. Rev. Lett. 79, 553 (1997)]