Multiplicity fluctuations at the quark-hadron phase transition from a fluid dynamical model

Understand

The region of large net-baryon densities in the QCD phase diagram is expected to exhibit a first-order phase transition.

• Experimentally, its study will be one of the primaryobjectives for the upcoming FAIR accelerator.
• We model the transition between quarks and hadrons in a heavy-ion collision using a fluid which is coupled to the explicit dynamics of the chiral order parameter and a dilaton field.
• This allows us to investigate signals stemming from the nonequilibrium evolution during the expansion of the hot plasma.