Berlin 2005 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 5: Theorie

HK 5.1: Vortrag

Freitag, 4. März 2005, 14:00–14:15, TU MA005

Goldstone boson condensation in the color-flavor locked phase — •Michael Buballa — Institut für Kernphysik, TU Darmstadt

It is generally believed that strongly interacting matter at low temperatures and very high densities is a color superconductor in the color-flavor locked (CFL) phase. The situation is less clear at “moderate” densities which could be relevant, e.g., for the interiors of neutron stars. Based on low-energy effective theories it has been suggested that, as a consequence of the stress posed by the strange quark mass, the CFL phase should eventually become unstable to the formation of pion or kaon condensates. On the other hand, various so-called gapless color-superconducting phases have been found in recent NJL model studies, which, however, neglect the possibility of Goldstone condensates. In this talk we present an NJL-type model which has been extended to include this possibility by allowing for pseudoscalar diquark condensates in addition to the scalar ones which constitute the CFL phase. We show that the results obtained within this model, e.g., the dependence of the free energy in the Goldstone condensed phases on quark masses or charge chemical potentials are in good qualitative – in most cases even quantitative – agreement with the low-energy effective theory approach. The phase structure emerging from this model is discussed.