Dynamic phase transition of charged dilaton black holes

Abstract

Dynamic phase transition of charged dilaton black holes is investigated in this paper. We introduce the Gibbs free energy landscape and calculate the corresponding $G_L$ for the dilaton black hole. On the one hand, we numerically solve the Fokker-Planck equation constrained by only the reflecting boundary condition. The effects of dilaton gravity on the probabilistic evolution of dilaton black holes are quite obvious. Firstly, the horizon radius difference between the large dilaton black hole and small dilaton black hole increases with the parameter $\alpha$. Secondly, with the increasing of $\alpha$, the system needs much more time to achieve a stationary distribution. Thirdly, the value which $\rho (r_l,t)$ and $\rho (r_s,t)$ finally attain varies with the parameter $\alpha$. On the other hand, resolving Fokker-Planck equation constrained by both the reflecting boundary condition and absorbing boundary condition, we investigate the first passage process of dilaton black holes. The initial peak decays more slowly with the increase of $\alpha$, which can also be witnessed from the slow down of the decay of $\Sigma (t)$ (the sum of the probability that the black hole system having not finished a first passage by time $t$). Moreover, the time corresponding to the single peak of the first passage time distribution is also found to increase with the parameter $\alpha$. Considering all the observations mentioned above, the dilaton field does slow down the dynamic phase transition process between the large black hole and small black hole.

12 pages, 5 figures

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