Relaxation times and passive forces
The question of the kinetic equations for the evolution of solids, apparently, is one of the most complex, since in comparison with gas and liquid systems, deformation states play an additional important role in them, which determine spatio-temporal correlations in the local mechanical and density characteristics [65-72]. Taking into account the rapid thermal relaxation in solids and the establishment of the total temperature, the system of equations written out is sharply reduced when describing ‘frozen’ or metastable states. In this case, the so-called flicker noise is often observed, which is associated with the rearrangement of the solid matrix over long times [73, 74]. The physical nature of this phenomenon can be different [75-77], and requires analysis in specific processes. The constructed equations make it possible to pass from phenomenological constructions  to atomic-molecular models of such processes.