Acoustical activity in the framework of the rotation-gradient theory of elasticity

The phenomenon of acoustical activity is examined within the framework of the rotation-gradient theory of elasticity. The nonvanishing independent components of the fourth-rank pseudotensor responsible for acoustical activity are worked out and tabulated for all the crystal classes. In the context of acoustic wave propagation the concept of pure mode axes is discussed when the acoustical activity tensor has nonzero components. The point-group symmetries allowing acoustical activity are identified. These results are compared with those based on the theory of acoustical activity due to Portigal and Burstein.

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