Polarization of Λ Hyperons in Gold Nucleus Collisions at NICA Energies

Simulations of peripheral Au + Au collisions at NICA energies are performed in the PHSD transport model. The properties of velocity and vorticity fields, as well as hydrodynamic helicity, are studied in dependence on the impact parameter and energy. There is a region of the velocity field that follows the Little Bang pattern, which may be quantified by Hubble’s law. Quadrupole structures of the vorticity field in all planes are obtained. The effect of helicity separation is found in the PHSD model. A calculation of Λ ‑hyperon polarization is performed in the thermodynamic and anomalous models at NICA energies.