Chiral phase transition in an expanding quark system

We investigate the influence of chiral symmetry which varies along space-time evolution a system, by considering phase transition in nonequilibrium expanding quark-antiquark system. The is described mean field order parameter, whose value solution self-consistent equation, and affects system through force term Vlasov equation. equation gap are solved concurrently continuously for longitudinal boost-invariant transversely rotation-invariant This numerical framework enables us to carefully how collision affect It observed that gives rise kink flow velocity, caused enhanced larger susceptibility tends be smoothed out effects. spatial boundary appears as ``wall'' quarks, quarks with low momentum bounced back, while those high go wall but slowed down.