2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/108269We discuss ground state properties of a mixture of two fermion species which can bind to form a molecular boson. When the densities of the fermions are unbalanced, one or more Fermi surfaces can appear: we describe the constraints placed by Luttinger's theorem on the volumes enclosed by these surfaces in such Bose-Fermi mixtures. We also discuss the nature of the quantum phase transitions involving changes in the number of Fermi surfaces.7 pages with one figure embedded. V2: Minor modifications. Final version as appeared in printSuperconductivityHigh Energy Physics - PhenomenologyNuclear Theorytext