Long-time behaviour for a non-autonomous Klein-Gordon-Zakharov system

The aim of this paper is to study the long-time dynamics solutions evolution system { u t ? ? + ? ( ) 1 2 a ? v = f , x ? ? × ? ? 0 subject boundary conditions ? where bounded smooth domain in R n ? 3 with ?? assumed be regular enough, > constant, Hölder continuous function and dissipative nonlinearity. This problem non-autonomous version well known Klein-Gordon-Zakharov system. Using uniform sectorial operators theory, we will show local global well-posedness H L . Additionally, prove existence, regularity upper semicontinuity pullback attractors.