2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/186836We discuss in detail the derivation of the leading four-nucleon force in chiral effective field theory using the method of unitary transformation. The resulting four-nucleon force is given in both momentum and configuration space. It does not contain any unknown parameters and can be used in few- and many-nucleon studies.22 pages, 13 figuresNuclear Theorytext