Abstract
The microscopic derivation of the interaction between rotons is presented both for large values of the total momentum Q and for Q=O. Calculating the scattering amplitude of the roton pairs by use of the second-order perturbation theory, we have obtained effective roton-roton interactions which have the order of magnitude of 1038 erg·cm3 for the large momentum and 1039 erg·cm3 for Q=O. These values are consistent with the results of the viscosity coefficients measurement and the Raman scattering experiment, respectively.
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