Correlations of the Velocities and of the Vorticities for Nucleons and Pions in PHSD Model

The correlations of the velocities and of the vorticities for pions and nucleons are investigated in frames of the PHSD model for Au+Au collisions at $$\sqrt{s_{NN}}=7.8$$ GeV and fixed impact parameter $$b=7.5$$ fm. The different behavior of correlations for these kinematic quantities is observed. It is shown that after the time of the separation of the nuclei this difference is due to the ‘microscopic’ Hubble flow. However, for earlier times the reasons are more complicated.