No, sound waves themselves are not subject to time dilation. Time dilation is a phenomenon that occurs due to differences in relative motion or gravitational fields, as described by Einstein's theory of relativity.
Time dilation refers to the effect of time appearing to pass at different rates for objects or observers that are moving relative to each other or experiencing different gravitational forces. This phenomenon primarily applies to the passage of time itself, not to specific physical waves like sound waves.
Sound waves, on the other hand, are vibrations that propagate through a medium, such as air or water. They are governed by the properties of that medium and the speed of sound within it, but they are not directly affected by time dilation.
However, it is worth noting that if an observer is moving relative to the source of a sound wave, the perceived frequency and pitch of the sound may be affected due to the Doppler effect. This is a different phenomenon from time dilation and relates to changes in perceived frequency rather than the passage of time.