2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/191650We develop a new model of a spinning particle in Brans-Dicke spacetime using a metric-compatible connection with torsion. The particle's spin vector is shown to be Fermi-parallel (by the Levi-Civita connection) along its worldline (an autoparallel of the metric-compatible connection) when neglecting spin-curvature coupling.8 pages Corrected typo in address footnoteGeneral Relativity and Quantum Cosmologytext