In transonic BEC flows the sonic point forms the upstream boundary of the dark-soliton branch because the soliton's fluid-frame speed cannot exceed the local sound speed.
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Dark-Soliton Branch Blocking in Transonic Bose--Einstein Condensate Flows
In transonic BEC flows the sonic point forms the upstream boundary of the dark-soliton branch because the soliton's fluid-frame speed cannot exceed the local sound speed.