Abstract
The four heat-mode contribution to the sound attenuation and dispersion in a critical fluid is studied. The equal-time correlation function of four order-parameter fluctuations which enters this contribution is evaluated using the renormalization group method up to O(ε2) where ε= 4 − d, d being the dimensionality of space. The results eliminate the discrepancies between the existing theory and experiments of high frequency sound attenuation and dispersion.
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