München 2019 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 35: Heavy-Ion Collisions and QCD Phases VII

HK 35.5: Vortrag

Mittwoch, 20. März 2019, 15:15–15:30, HS 12

(Non-)equilibrium dynamic critical phenomena — •Dominik Schweitzer¹, Sören Schlichting², and Lorenz von Smekal¹ — ¹Justus-Liebig-Universität, Gießen, Germany — ²Universität Bielefeld, Germany

Uncovering the phase diagram of QCD is one of the main goals of heavy-ion collision experiments. One expects to find a critical point at the end of the chiral transition line at finite temperature and baryon chemical potential. To confirm and locate it, one will have to find signatures of critical behaviour in collision experiments.

Collision experiments inherently are dynamic in nature; therefore, one has to study the dynamics of critical phenomena.

Close to a critical point, different theories show the same universal behaviour. This allows us to gain meaningful insight without looking at full QCD. We use one-component φ⁴ theory on the lattice and calculate spectral functions from real-time simulations. From those we extract relaxation times and the dynamic critical exponent z.

By introducing a coupling to a heat bath and an explicit symmetry breaking, we can force the system along Trajectories through its phase diagram. This then allows us to numerically study the non-equilibrium critical dynamics of a field theory.