Title: Ginzburg-Landau approach to the QCD phase-diagram
Language: English
Authors: Stetina, Stephan
Qualification level: Diploma
Advisor: Rebhahn, Anton 
Assisting Advisor: Schmitt, Andreas 
Issue Date: 2010
Number of Pages: 57
Qualification level: Diploma
We discuss the phase structure of dense matter, in particular the nature of the transition between hadronic and quark matter.
Calculations within a Ginzburg-Landau approach show that the axial anomaly can induce a critical point in this transition region. This is possible because in three-flavor quark matter with instanton effects a chiral condensate can be added to the color-flavor locked (CFL) phasewithout changing the symmetries of the ground state. In two-flavor quark matter such a critical point is not possible since the corresponding color superconductor (2SC) does not break chiral symmetry. We study the effects of a nonzero but finite strange quark mass which interpolates between these two cases. Since at ultra-high density the first reaction of CFL to a nonzero strange quark mass is to develop a kaon condensate, we extend previous Ginzburg-Landau studies by including such a condensate. We discuss the fate of the critical point systematically and show that the continuity between hadronic and quark matter can be disrupted by the onset of a kaon condensate. Moreover, we identify the mass terms in the Ginzburg-Landau potential which are needed for the 2SC phase to occur in the phase diagram.
Keywords: Ginzburg Landau - Phasendiagramm - QCD
Ginzburg Landau - phasediagram - QCD
URI: https://resolver.obvsg.at/urn:nbn:at:at-ubtuw:1-39906
Library ID: AC07809175
Organisation: E136 - Institut für Theoretische Physik 
Publication Type: Thesis
Appears in Collections:Thesis

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