title: Interactions between dark solitons.
abstract: The interaction forces between two dark solitons are numerically investigated. It is found that dark solitons are less affected than bright solitons by their respective interaction forces. An empirical expression for the separation of two solitons as a function of initial separation and traveling distance is deduced, which agrees well with numerical results.
authors.forename: W
authors.initials: W
authors.lastname: Zhao
authors.forename: E
authors.initials: E
authors.lastname: Bourkoff