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We have developed a relativistic point-coupling model of nuclear many-bodydynamics constrained by the low-energy sector of QCD. The effective Lagrangianis characterized by density-dependent coupling strengths determined by chiralone- and two-pion exchange (with single and double delta isobar excitations)and by large isoscalar background fields that arise through changes of thequark condensate and the quark density at finite baryon density. The model hasbeen tested in the analysis of nuclear ground-state properties along differentisotope chains of medium and heavy nuclei. The agreement with experimental datais comparable with purely phenomenological predictions. The built-in QCDconstraints and the explicit treatment of pion exchange restrict the freedom inadjusting parameters and functional forms of density-dependent couplings. It isshown that chiral pionic fluctuations play an important role for nuclearbinding and saturation mechanism, whereas background fields of about equalmagnitude and opposite sign generate the effective spin-orbit potential innuclei.Comment: ws-procs9x6.cls, 8 pgs, Talk presented at "X Convegno su Problemi di  Fisica Nucleare Teorica", Cortona (AR), 6-9 october 200

NUCLEAR DENSITY FUNCTIONAL CONSTRAINED BY LOW-ENERGY QCD