2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/28406The coexistence of the universal transverse force and the non-universal friction force on a topological singularity in a superfluid is shown here. Based on the BCS type microscopic theory, we explicitly evaluate the quasiparticle contribution to the friction coefficient in a clean fermionic superfluid, showing a new feature of logarithmic divergence.Latex, 4 pagesCondensed Mattertext