2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/211844The quantum-kinetic energy of a finite number of trapped fermionic atoms provides a restoring force for shear motion due to a distortion of the momentum distribution. In analogy to the twist mode of nuclear physics it is proposed that counter-rotating the upper and lower hemisphere of a spherical atomic cloud yields a finite-frequency mode closely related to transverse zero-sound waves in bulk Fermi liquids.4 pages, 1 table (using REVTeX)Statistical MechanicsNuclear Theorytext