PT-symmetric scattering in flow duct acoustics
Classical Physics
2017-05-03 v1
Abstract
We show theoretically and experimentally that the propagation of an acoustic wave in an airflow duct going through a pair of diaphragms, with equivalent amount of mean-flow-induced effective gain and loss, displays all the features of a parity-time (PT) symmetric system. Using a scattering matrix formalism, we observe experimentally the properties which reflect the PT-symmetry of the scattering acoustical system: the existence of a spontaneous symmetry breaking with symmetry-broken pairs of scattering eigenstates showing amplification and reduction, and the existence of points with unidirectional invisibility.
Cite
@article{arxiv.1701.07618,
title = {PT-symmetric scattering in flow duct acoustics},
author = {Yves Aurégan and Vincent Pagneux},
journal= {arXiv preprint arXiv:1701.07618},
year = {2017}
}
Comments
5 pages, 5 figures