Speaker
Po-Cheng Lin
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P5.4003.pdf
Interacting Multiscale Defects in Dust Acoustic Wave Turbulence
Po-Cheng Lin1, Lin I1
1
Department of Physics, National Central University, Jhongli, Taiwan
In a single scale weakly disordered nonlinear wave, topological defects in the form of worm
like filament has been observed [1]. Whether and how wave turbulence exhibits a continuous
multi-scale power spectrum can also be characterized by multi-scale defects are challenging
open issue due to difficulty of decomposing the modes through Fourier representation. In this
work, through novel multi-dimensional empirical mode decomposition, we experimentally
demonstrate the 3D dust acoustic wave turbulence can be view as a zoo of the interacting
multiscale acoustic vortices with helical waveforms winding around worm-like defect
filaments, similar to the multi-scale worm-like coherent vortices in the hydrodynamic
turbulence.
[1] Y.Y. Tsai and L. I, Phys. Rev. E. 90, 013106 (2014)
