State density of a system of anharmonic oscillators in a glass
Karpov V. G., Parshin D. A.
There are singularities in the energy distribution of the state density of a system of noninteracting anharmonic oscillators. These singularities can explain the low-frequency Raman peaks in glasses, the plateau on the temperature dependence of the thermal conductivity, and why the specific heat exceeds the Debye value.