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physics.class-ph2024
On the covariance of the d'Alembert equation: the cases of sound and light
Francisco Caruso, Vitor Oguri
The covariance of the d'Alembert equation for acoustic phenomena, described by mechanical waves in one or three spatial dimensions, under Galilean transformations, is demonstrated…
physics.class-ph2023
On the Galilean covariance of the d'Alembert equation for acoustic phenomena
Francisco Caruso, Vitor Oguri, Felipe Silveira
The covariance of the d'Alembert equation for acoustic phenomena -- which is a mechanical wave equation -- under the conventional Galilean transformation is demonstrated without th…