Causality in Condensates: Grey Solitons as Remnants of BEC Formation
arXiv:0902.3980 · doi:10.1103/PhysRevLett.102.105702
Abstract
Symmetry breaking during phase transitions can lead to the formation of topological defects (such as vortex lines in superfluids). However, the usually studied BEC's have the shape of a cigar, a geometry that impedes vortex formation, survival, and detection. I show that, in elongated traps, one can expect the formation of "grey solitons" (long-lived, non-topological "phase defects") as a result of the same mechanism. Their number will rise approximately in proportion to the transition rate. This steep rise is due to the increasing size of the region of the BEC cigar where the phase of the condensate wavefunction is chosen locally (rather than passed on from the already formed BEC).
Typos in Eq. (3), (13), and (25) fixed
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