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We investigate an attractive Bose-Einstein condensate in two coupled onedimensional channels. In this system a stable double channel soliton can beformed. It is symmetric for small interaction parameters and asymmetric forlarge ones. We study this symmetry breaking phenomenon in detail. Next, weinvestigate the dynamics of symmetric double channel soliton collisions. Forsufficiently strong interactions we observe spontaneous symmetry breakingduring the collision. Approximate considerations based on two differentmethods, Bogoliubov and variational, are used to describe this effect. Theresults are compatible.

Symmetry breaking in the collisions of double channel BEC solitons