Gauge Invariance Approach to Acoustic Fields
This book highlights the symmetry properties of acoustic fields and describes the gauge invariance approach, which can be used to reveal those properties. Symmetry is the key theoretical framework of metamaterials, as has been demonstrated by the successf
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Gauge Invariance Approach to Acoustic Fields
Gauge Invariance Approach to Acoustic Fields
Woon Siong Gan
Gauge Invariance Approach to Acoustic Fields
123
Woon Siong Gan Acoustical Technologies Singapore Pte Ltd. Singapore, Singapore
ISBN 978-981-13-8750-0 ISBN 978-981-13-8751-7 https://doi.org/10.1007/978-981-13-8751-7
(eBook)
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To Raymond Stephens My Ph.D Supervisor
Foreword
I first encountered Woon Siong Gan during the 22nd International Conference of Sound and Vibration (ICSV22) in Florence in July 2015. After the first meeting, I soon realized that his expressed interests in nonlinear acoustics, fundamental physics and Lie groups were the surface tell tales of wide-ranging curiosity and a talent for careful analysis. He was, and is, a researcher interested in building, but he was, and is, equally interested in ideas. We both were elected as directors of the International Institute of Acoustics and Vibrations (IIAV) for the period 2018– 2022, the first time for me and the second time for Woon Siong, who was first elected in 2002. Not long thereafter, Woon Siong asked if I would be willing to co-chair a special session in “Nonlinear Acoustics and Vibrations” during ICSV23. My first reaction was to accept with pleasure this proposal since I consider nonlinear science as a new workhouse for improving technologies and knowledge in various domains of applied acoustics such as nondestructive testing (NDT), medical imaging and analysis of complex data in the wide sense. Our plan was to invite eminent scientists who are making major contributions in different areas of nonlin
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