Dynamical evolution of a magnetic field in the preequilibrium quark-gluon plasma

High-energy heavy-ion collisions generate extremely strong magnetic field which plays a key role in number of novel quantum phenomena quark-gluon plasma (QGP), such as the chiral effect (CME). However, due to complexity theoretical modellings coupled electromagnetic fields and QGP system, especially pre-equilibrium stages, lifetime medium remains undetermined. We establish, for first time, kinetic framework study dynamical decay early stages weakly by solving Boltzmann Maxwell equations. find that at late times magnetohydrodynamical description system emerges. With respect realistic RHIC LHC, we estimate residual strength when start evolve hydrodynamically.