Comment on "Effect of rotation on the elastic moduli of solid 4He"

This Comment is on the paper "Effect of rotation on the elastic moduli of solid He-4" by T. Tsuiki, D. Takahashi, S. Murakawa, Y. Okuda, K. Kono, and K. Shirahama [Phys. Rev. B 97, 054516 (2018)]. The authors speculate on a putative effect of the effective mass of He-3 impuritons on the angular momentum of solid He-4 under rotation. This is a crucial point in their work when trying to explain the variation of the share modulus, mu, with temperature. They refer also to my general theory of kinetics and dynamics of quasiparticles in nonstationary moving bodies subjected to time varying deformations [cf, e.g., Phys. Rep. 354, 411 (2001)] and in particular to the effect of a strong anisotropy in the temperature dependence of the vacancy diffusion under rotation. The effect is due to Coriolis force. The authors apply by analogy the same idea to He-3 impuritons. However their consideration is inconsistent. They replace the bare mass of impurity in the Coriolis force by the impuriton effective mass. The role of the Coriolis force on the impuriton diffusion becomes highly exaggerated and leads to a not existing effect.