Nonresonant acoustic absorption of Ising magnet

Zubarev's nonequilibrium statistical operator method is used to construct a theory of the nonresonant acoustic absorption of the linear Ising magnet, the basic Hamiltonian of which is of the two-particle kind and is treated without approximations. The frequency dependence of the absorption is determined and found to differ analytically from the well-known Debye curve $\chi''_{\textup{Д}}(\omega)$ but for reasonable values of the physical parameters gives an envelope that agrees qualitatively with $\chi''_{\textup{Д}}(\omega)$.