QFS2016 Book of Abstracts

Abstracts

O3.1 Ultraquantum decay of strongly nonequilibrated BEC turbulence G.W. Stagg, N.G. Parker, and C.F. Barenghi School of Mathematics and Statistics and Joint Quantum Centre Durham-Newcastle, Newcastle University, Newcastle upon Tyne, NE1 7RU, United Kingdom Following Berloff and Svistunov (2002) we study the emergence of a macroscopically coherent condensate from the cooling of a thermal gas of weakly-interacting bosons. Starting from a uniformy occupied highly nonequilibrated condition, we track the growth of the low k modes which feature a tangle of quantised vortex lines. Analysis of vortex line density, incompressible energy spectrum and correlation function suggests that the tangle is a random flow without large scale structures similar to the ultraquantum turbulence of Walmsley and Golov (2008) and the counterflow turbulence first observed by Vinen.

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