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Dissipative nonlinear waves in a gravitating quantum fluid

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Abstract.

Nonlinear wave propagation is studied in a dissipative, self-gravitating Bose-Einstein condensate, starting from the Gross-Pitaevskii equation. In the absence of an exact analytical result, approximate methods like the linear analysis and perturbative approach are applied. The linear dispersion relation puts a restriction on the permissible range of the dissipation parameter. The waves get damped due to dissipation. The small amplitude analysis using reductive perturbation technique is found to yield a modified form of KdV equation, which is solved both analytically as well as numerically. Interestingly, the analytical and numerical plots match excellently with each other, in the realm of weak dissipation.

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Correspondence to Anjana Sinha.

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Sahu, B., Sinha, A. & Roychoudhury, R. Dissipative nonlinear waves in a gravitating quantum fluid. Eur. Phys. J. Plus 133, 51 (2018). https://doi.org/10.1140/epjp/i2018-11877-3

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