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Holographic Thermalization in Charged Dilaton Anti-de Sitter Spacetime

We study holographic thermalization in spacetimes with a chemical potential and a non-trivial dilaton field. Three non-local observables are used to probe the whole process and investigate the effect of the ratio of the chemical potential over temperature $χ$ and the dilaton-Maxwell coupling constant $α$. It is found that the saturation time is not always a monotonically increasing function of $χ$, the situation depends on $α$. When $0 \leqα\leq 1$, larger $χ$ yields longer saturation time, while for $α>1$, the situation becomes more complex. More interesting, we found that although $α$ indeed has influence on the whole thermalization process, it nearly does not affect the saturation time, which indicates the universality of the saturation time for the dual one-parameter field theories.