N. Vladimirova, G. Falkovich, S. Derevyanko

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Presentation transcript:

N. Vladimirova, G. Falkovich, S. Derevyanko Phase transitions in turbulence Coherence and fluctuations: turbulence as quantum phenomenon N. Vladimirova, G. Falkovich, S. Derevyanko Heidelberg , June 21, 2012

We expect from turbulence fragmentation, mixing and loss of coherence. However, an inverse turbulent cascade proceeds from small to large scales and brings some self-organization and eventually appearance of a coherent system-size condensate.

Gross-Pitaevsky model – nonlinear Schrodinger equation

Optical turbulence Two integrals of motion – two cascades k With cold atoms one needs to supply constantly high-momentum atoms and simultaneously cool the system to preserve the energy . Inverse cascade k

Condensate growth

Early stage of condensate growth Field amplitude in space Fourier spectrum

Collective oscillations

And then The surprises start

Spectra Flux lines in Fourier space

Hexatic phase? Correlation function of the over-condensate fluctuations

Conclusion

Condensation in turbulence

V. E. Zakharov, V. S. L'vov, G. Falkovich, Kolmogorov Spectra of Turbulence, Springer, Berlin, 1992 http://www.weizmann.ac.il/home/fnfal/papers/book.html