München 2019 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 35: Heavy-Ion Collisions and QCD Phases VII
HK 35.5: Talk
Wednesday, March 20, 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.