Repeated oscillation about a stable equilibrium
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- The study of waves is important to virtually every branch of science and engineering. Indeed, waves are also important to everyday life. Sound waves allow us to hear, and electromagnetic waves allow us to see.
- D. S. Drumheller (13 February 1998). Introduction to Wave Propagation in Nonlinear Fluids and Solids. Cambridge University Press. p. 1. ISBN 978-0-521-58746-4.
- The mass gap is the reason, if you will, that we do not see classical nonlinear Yang-Mills waves. They are a good approximation only under inaccessible conditions. I have spent most of my career wishing that we had a really good way to quantitatively understand the mass gap in four-dimensional gauge theory. I hope that this problem will be solved one day.