Frankfurt 2014 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 20: Schwerionenkollisionen und QCD Phasen
HK 20.4: Vortrag
Dienstag, 18. März 2014, 14:45–15:00, HZ 7
Inhomogeneous phases of isospin-asymmetric matter in the Nambu–Jona-Lasinio model — •Daniel Nowakowski1,2, Michael Buballa1, Stefano Carignano3, and Jochen Wambach1 — 1Institut für Kernphysik, Technische Universität Darmstadt — 2ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung — 3Department of Physics, University of Texas at El Paso
We investigate the phase structure of strong-interaction matter within a two-flavor Nambu–Jona-Lasinio model. Earlier it has been shown for degenerate quark flavors that chiral symmetry-breaking phases with spatially modulated order-parameters can occur. We analyze the emergence of these inhomogeneous phases in isospin-asymmetric matter by extending the model through an additional isospin chemical potential, however restricting the order-parameter to be spatially modulated in only one dimension. It is found that for a non-vanishing isospin chemical potential the formation of inhomogeneous chiral symmetry-breaking phases is disfavored, when enforcing equal periodicities for the up and down quarks and neglecting charged pion condensation. If the periodicities of the quarks are not limited to be of the same magnitude, inhomogeneous chiral symmetry-breaking phases are found to be less sensitive to the additional pairing stress and can occur in a larger domain of the phase diagram. As an outlook we discuss possible extensions, like the addition of inhomogeneous charged pion condensation or color superconductivity.