Shock waves in a quasi one-dimensional Bose-Einstein condensate
arXiv:1504.07517 · doi:10.1140/epjp/i2016-16066-x
Abstract
We study analytically and numerically the generation of shock waves in a quasi one-dimensional Bose-Einstein condensate (BEC) made of dilute and ultracold alkali-metal atoms. For the BEC we use an equation of state based on a 1D nonpolynomial Schrodinger equation (1D NPSE), which takes into account density modulations in the transverse direction and generalizes the familiar 1D Gross-Pitaevskii equation (1D GPE). Comparing 1D NPSE with 1D GPE we find quantitative differences in the dynamics of shock waves regarding the velocity of propagation, the time of formation of the shock, and the wavelength of after-shock dispersive ripples.
11 pages, 4 figures, a typo in Eq. (3) has been corrected, analysis of after-shock dynamics added (with two figures). Title and abstract changed. To be published in European Physical Journal Plus
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