Solitary waves in clouds of Bose-Einstein condensed atoms
  We consider the conditions under which solitary waves can exist in elongated clouds of Bose-Einstein condensed atoms. General expressions are derived for the velocity, characteristic size, and spatial profile of solitary waves, and the low- and high-density limits are examined. 
A. D. Jackson (Niels Bohr Inst.), G. M. Kavoulakis (Nordita), and C.   J. Pethick (Nordita and Physics Dept., Univ. of Illinois)