Sub-topics: QCD phase transitions, Color superconducitivity, Gluons and confinement

People working on this subject:

Jochen Wambach, Michael Buballa, Mathias Wagner, Verena Kleinhaus, Hannes Basler, Klaus Heckmann

QCD phase transitions

People working on this sub-topic:

Jochen Wambach, Michael Buballa, Mathias Wagner

External collaborations:

• Jiri Hosek (Czech Academy of Sciences, Rez near Prague)
• Micaela Oertel (Observatoire de Paris-Meudon)
• Reinhard Alkofer (Universität Graz)
• Bernd-Jochen Schaefer (Universität Graz)
• Axel Maas (Slovak Academy of Sciences, Bratislava)

Some recent publications:

• The Phase Diagram of the Quark-Meson Model
• Flavor-Mixing Effects on the QCD Phase Diagram at non-vanishing Isospin Chemical Potential: One or Two Phase Transitions?
• Finite-Temperature Gluon Condensate with Renormalization Group Flow Equations
• Color-Flavor Unlocking and Phase Diagram with Self-Consistently Determined Strange Quark Masses
• Self-consistent parametrization of the two-flavor isotropic color-superconducting ground state
• Renormalization Group Flow Equations For The Scalar O(N) Theory
• Renormalization Group Flow Equations and the Phase Transition in O(N)-models
• Flow Equations and the Chiral Phase Transition
• On the Convergence of the Expansion of Renormalization Group Flow Equation
• The Octet Of Goldstone Modes In The SU(3) Linear Sigma Model In The QRPA
• A Nonperturbative Treatment Of The Pion In The Linear Sigma Model

Review articles:

• F. Wilczek: QCD In Extreme Conditions
• K. Wilson and J. Kogut: The Renormalization Group and the epsilon Expansion (Physics Reports 12 no.2 (1974) 75-200)

Books:

• M. Le Bellac: Quantum and Statistical Field Theory (Oxford Science Publication, Reprint 1995)
• J. Binney, N. Dowrick, A. Fisher and M. Newman: The Theory of Critical Phenomena: An Introduction to the Renormalization Group (Oxford Science Publication, Reprint 1993)

Talks:

• B.-J. Schaefer: Critical Region of the QCD Phase Transition - Mean field vs. Renormalization group (PDF, 1.1 MB)
• B.-J. Schaefer: Susceptibilities near the (tri) critical point - Mean field vs. Renormalization group (PDF, 754 kB)
• D. Nickel: Chiral Extrapolations and Non-Analytic Terms
• B.-J. Schaefer: The phase diagram of Nf=2 QCD
• B.-J. Schaefer: QCD Summenregeln im Ortsraum
• B.-J. Schaefer: The Chiral Phase Transition From Non-Perturbative Flow Equations

Completed theses:

• PhD
  • Renormierungsgruppen-Flussgleichungen und der chirale Phasenübergang (Oliver Bohr, 2001)
• Diploma
  • Chirale Extrapolation mit dem 1/Nc korrigierten NJL-Modell (Dominik Nickel, 2003)
  • Das QCD-Phasendiagramm bei endlicher Isospindichte (Martin Frank, 2003)
  • Nichtperturbative Behandlung des linearen SU(3)-Sigma-Modells (Oliver Bohr, 1997)

Color superconductivity

People working on this sub-topic:

Jochen Wambach, Michael Buballa, Verena Kleinhaus, Hannes Basler

External collaborations:

• Jiri Hosek (Czech Academy of Sciences, Rez near Prague)
• Micaela Oertel (Observatoire de Paris-Meudon)
• Reinhard Alkofer (Universität Graz)

Some recent publications:

• The phase diagram of neutral quark matter: The effect of neutrino trapping
• The phase diagram of neutral quark matter: Self-consistent treatment of quark masses
• NJL-model description of Goldstone boson condensation in the color-flavor locked phase
• Mixed phases of color superconducting quark matter
• Color superconductivity in two- and three-flavor systems at moderate densities
• Anisotropic admixture in color-superconducting quark matter
• Color-Flavor (Un)locking
• Color-Flavor Unlocking and Phase Diagram with Self-Consistently Determined Strange Quark Masses
• Self-consistent parametrization of the two-flavor isotropic color-superconducting ground state
• Virtual particles versus superconductive vacuum polarizations in interacting systems

Review article:

• K. Rajagopal et al.: The Condensed Matter Physics of QCD

Talks:

• V. Werth: The phase diagram of neutral quark matter (PDF, 506 kB)
• D. Nickel: The Quark Propagator in Superconducting Phases (PDF, 563 kB)
• V. Werth: The phase diagram of neutral quark matter
• M. Buballa: Goldstone boson condensation in the color-flavor locked phase
• D. Nickel: The infrared behavior of QCD propagators at non-vanishing temperatures and densities
• M. Buballa: The phase diagram of neutral dense quark matter
• V. Werth: Color superconductivity in compact stars
• F. Neumann: Diquarkkondensation in elektrisch- und farbneutraler Materie
• M. Buballa: Diquark condensation in electrically and color neutral quark matter
• M. Buballa: Color Superconductivity in Two- and Three-Flavor Systems at Moderate Densities

Completed theses:

• Habilitation
  • NJL-model analysis of quark matter at large density (Michael Buballa, 2004)
• PhD
  • Color-superconductivity from a Dyson-Schwinger perspective (Dominik Nickel, 2007)
• Diploma
  • Farbsupraleitung in Neutronen- und Protoneutronensternen (Verena Werth, 2004)
  • Zustandsgleichung dichter Quarkmaterie (Frederik Neumann, 2003)

Gluons and confinement

People working on this sub-topic:

Jochen Wambach

External collaborations:

• Christian Fischer (Technische Universität Darmstadt)
• Reinhard Alkofer (Universität Graz)
• Axel Maas (Slovak Academy of Sciences, Bratislava)

Some recent publications:

• Infrared Properties of QCD from Dyson-Schwinger equations
• Gluons at finite temperature in Landau gauge Yang-Mills theory
• Solving a Set of Truncated Dyson-Schwinger equations with a globally converging methods
• The High-Temperature Phase of Landau-Gauge Yang-Mills Theory
• Finite-Temperature Yang-Mills Theory in Landau Gauge
• The Ghost-Gluon Vertex in Landau Gauge Yang-Mills Theory
• Infrared behaviour of the ghost-gluon vertex in Landau gauge Yang-Mills theory
• Residual Confinement in High-Temperature Yang-Mills Theory
• Temperature Dependence of Gluon and Ghost Propagators in Landau-Gauge Yang-Mills Theory below the Phase Transition
• High-Temperature Limit of Landau-Gauge Yang-Mills Theory
• QCD Propagators at non-vanishing temperatures
• Towards the Finite Temperature Gluon Propagator in Landau Gauge Yang-Mills Theory

Review articles:

• C. S Fischer: Infrared Properties of QCD from Dyson-Schwinger equations
• A. Thomas: Boundary of Nuclear Physics and QCD
• R. Alkofer et al.: The Infrared Behaviour of QCD Green's Functions
• T. Kugo et al.: Local Covariant Operator Formalism of non-Abelian Gauge Theories and Quark Confinement problem (Suppl. Prog. Theor. Phys. No.66, p1, 1979)

Talks:

• C. Fischer: Dynamical scalar quark confinement (PDF, 1.4 MB)
• A. Maas: Gluon confinement
• A. Maas: Finite Temperature Yang-Mills Theory in Landau Gauge
• A. Maas: Towards the Phase Diagram of QCD in Landau Gauge
• A. Maas: Finite Temperature Gluon Propagator in Landau Gauge Yang-Mills Theory
• A. Maas: Towards the Finite Temperature Gluon Propagator in Landau Gauged Yang-Mills Theory

Completed theses

• PhD
  • The High-Temperature Phase of Yang-Mills Theory in Landau Gauge (Axel Maas, 2004)
• Diploma
  • The ghost-gluon vertex in Landau gauge Yang-Mills theory in four and three dimensions (Wolfgang Schleifenbaum, 2004)

Web page:

• D. Leinweber: Visualization of lattice QCD calculations