Heidelberg 2015 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 44: Heavy Ion Collisions and QCD Phases 5

HK 44.4: Vortrag

Mittwoch, 25. März 2015, 15:30–15:45, T/HS1

The QCD phase diagram from imaginary chemical potential — •Christopher Pinke and Owe Philipsen — Institut für Theoretische Physik, Goethe Universität Frankfurt am Main

The phase diagram of QCD is subject to ongoing investigations. First principle calculations are possible by means of Lattice QCD (LQCD) simulations. At non-zero values of the chemical potential, these are hampered by the sign-problem, which renders the currently available simulation algorithms ill-defined.

An up-to-now unresolved issue is the nature of the chiral transition in the limit of two massless flavours of quarks. This transition is either first or second order. It is important to clarify this issue in order to constrain the physical phase diagram of QCD, in particular regarding the possible existence of a critical end point in QCD at non-zero chemical potential.

At purely imaginary values of the chemical potential, QCD has very interesting symmetries. More specifically, the Roberge-Weiss or extended center symmetry limits the physically relevant region to be within specific values. In addition, the Roberge-Weiss transition, happening at these specific values, then allows for constraints on the physical phase diagram.

We explore this region by means of two flavour LQCD simulations and present results regarding the two flavour chiral limit.

Supported by the Hessian LOEWE initiative through the Helmholtz International Center for FAIR (HIC for FAIR).