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arXiv 1606.04248cond-mat.stat-mechmath.PR
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强电流下受驱动扩散系统的共形不变性

Conformal invariance in driven diffusive systems at high currents

D. Karevski, G. M. Schütz

摘要:

我们考虑驱动扩散系统的时空相关性,该系统经历了一个波动,进入一个具有巨大电流或动力学活动的区域。对于一个单一的保守质量,我们表明,在一个空间维的时空密度相关给出了共形不变场论与中心荷$c=1$,对应于一个弹道普适类的动力学指数$z=1$。我们推导出一个相图的非典型行为,除了共形不变的制度表现出一个制度的相分离的低电流或活动。在相变线上,对应于典型行为,动力学属于Kardar-Parisi-Zhang普适类,动力学指数为$z=3/2$,除了扩散点为$z=2$。我们证明了理论的有效性的一维非对称简单排斥过程的周期和开放的边界的动力学结构的最大电流极限的精确结果。

英文摘要:

We consider space-time correlations in driven diffusive systems which undergo a fluctuation into a regime with an atypically large current or dynamical activity. For a single conserved mass we show that the spatio-temporal density correlations in one space dimension are given by conformally invariant field theories with central charge $c=1$, corresponding to a ballistic universality class with dynamical exponent $z=1$. We derive a phase diagram for atypical behaviour that besides the conformally invariant regime exhibits a regime of phase separation for atypically low current or activity. On the phase transition line, corresponding to typical behaviour, the dynamics belongs to the Kardar-Parisi-Zhang universality class with dynamical exponent $z=3/2$, except for a diffusive point with $z=2$. We demonstrate the validity of the theory for the one-dimensional asymmetric simple exclusion process with both periodic and open boundaries by exact results for the dynamical structure in the limit of maximal current.

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