From GPE to KPZ: finite temperature dynamical structure factor of the 1D Bose gas

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• Dr Austen Lamacraft, U of Cambridge
• Thursday 18 October 2012, 13:45-15:00
• Theory Library.

If you have a question about this talk, please contact Dr Dimitri M Gangardt.

We study the finite temperature dynamical structure factor of a 1D Bose gas using numerical simulations of the Gross—Pitaevskii equation appropriate to a weakly interacting system. The lineshape of the phonon peaks reveals a remarkable connection to the Kardar—Parisi—Zhang universality class of dynamical critical phenomena, with a width proportional to |k|^{3/2} at low wavevectors, and a non-Lorentzian lineshape. This anomalous hydrodynamic behavior is the most significant `beyond Luttinger liquid’ effect at finite temperature.

This talk is part of the Theoretical Physics Seminars series.

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