J. Stein, R. Oppermann: One-loop result for the Bogoliubov-Anderson mode of the superconducting strong-coupling attractive Hubbard model, Phys. Lett. A 184 (1994) 370
We present the one-loop calculations for the sound-like Bogoliubov-Anderson mode in the superconducting phase of the attractive Hubbard model in the strong-coupling limit. It is found that in the leading dimensional singularities and for low temperatures the zero-loop expression is modified only by a global correction factor; as a consequence, the dispersion relation and the Bogoliubov velocity retain their zero-loop results.