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artículo con referato
"Skyrmions in the presence of isospin chemical potential"
J.A. Ponciano and N.N. Scoccola
Phys. Lett. B 659(3) (2008) 551-554
We analyze the existence of localized finite energy topological excitations on top of the perturbative pion vacuum within the Skyrme model at finite isospin chemical potential and finite pion mass. We show that there is a critical isospin chemical potential μcI above which such solutions cease to exist. We find that μcI is closely related to the value of the pion mass. In particular for vanishing pion mass we obtain μcI = 0 in contradiction with some results recently reported in the literature. We also find that below μcI the skyrmion mass and baryon radius show, at least for the case of the hedgehog ansatz, only a mild dependence on the isospin chemical potential.
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