Chiral relativistic description of nuclear matter including effects of confinement

by Elisabeth Massot (IPN Lyon)

Wednesday 10 Feb 2010, 14:00 → 15:00 Europe/Paris

Bibliotheque

I will present a description of nuclear matter based on a relativistic Hartree-Fock model. The Hartree-Fock approximation, corresponding to the mean-field, is a way to solve the many-body problem and is wildly used in nuclear physics. I will start with a general presentation of this approximation and explain its role in nuclear matter tacking the Walecka model, base of relativistic approches. I will then present the model I developped during my phd. This last model is built as an effective theory of QCD, with relevant symmetries present in the Lagrangian. In particular, for effective theories it is important that chiral symmetry appears in the lagrangian. Unfortunatly, it is well-known that such models cannot reproduce correctly the properties of nuclear matter. This problem can be corrected adding a new term in the lagrangian, due to the quark substructure of the nucleon. The parameter of this term is constrained by lattice calculations. With the other parameters constrained mainly by hadron phenomenology, the results and applications are correct.