Abstract
The contribution of the population fluctuations of two-level systems in glasses to the dynamic structure factor\(S(\vec k,t)\) is calculated using the concept of elastic dipoles. Describing the two-level systems by the tunneling model, with reasonable assumptions about the distribution of tunneling frequencies an essentially logarithmic decay in time of\(S(\vec k,t)\) is obtained.
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Jäckle, J., Jüngst, K.L. Density fluctuations from elastic dipoles in glasses at low temperatures. Z Physik B 30, 243–253 (1978). https://doi.org/10.1007/BF01320029
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DOI: https://doi.org/10.1007/BF01320029