Abstract
The excitations connected with quantum condensation of a fermion gas are calculated quantitatively along the lines of a previous paper. We find exact agreement with earlier results: excitations of the phonon type in the absence of Coulomb interaction, strong indications for their nonexistence in the presence of this interaction.
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Lüders, G., Brandt, K. Collective excitations in superconductors. Z. Physik 268, 123–127 (1974). https://doi.org/10.1007/BF01669868
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DOI: https://doi.org/10.1007/BF01669868