Ponente
Prof.
Luc Marleau
(Université Laval)
Descripción
The Skyrme Model is low-energy QCD effective field theory from which baryons (and nuclei) emerge as topological solitons. Despite it provides a rather successful description of the nucleons, it overestimates the binding energies in nuclei by at least an order of magnitude. On the other hand Skyrme-like models that nearly saturate the Bogomol'nyi bound seem to provide to a better picture of nuclei since their mass is roughly proportional to the baryon number. We review the properties of such a models, so-called near-BPS Skyrme Models, which consist of terms up to order six in derivatives of the pion fields with the usual nonlinear sigma and Skyrme terms assumed to be relatively small. We compare the axial and rational map ansatz as solutions and identify the requirements to obtain the observed constant baryon density configurations. Fitting the four model parameters, we find a remarkable agreement for the binding energy per nucleon B/A with respect to experimental data thereby supporting the idea that nuclei could be near-BPS Skyrmions.
Autor primario
Prof.
Luc Marleau
(Université Laval)
