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arXiv 1504.03559hep-th
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电场猝灭、平衡与普适性

Electric Field Quench, Equilibration and Universal Behavior

S. Amiri-Sharifi, M. Ali-Akbari, H. R. Sepangi

摘要:

利用AdS/CFT对应研究了N=2强耦合规范理论中的电场猝灭.为此,我们考虑上述系统,该系统受到指示出平衡系统的随时间变化的电场的影响。定义平衡时间t_{eq}(注入能量后系统松弛到最终平衡态),我们发现重新缩放的平衡时间k^{-1} t_{eq}随着过渡时间k的增加而减少。因此,我们预期,对于足够大的过渡时间,k ->无穷大,系统弛豫到其最终平衡可以是一个绝热过程。另一方面,我们观察到快速猝灭的普遍行为,k << 1,这意味着重新缩放的平衡时间不依赖于随时间变化的电场的最终值。我们的计算推广到各种维度的系统也证实了普适化过程,这似乎是所有强耦合规范理论的一个典型特征,承认引力对偶。

英文摘要:

We study electric field quench in N=2 strongly coupled gauge theory, using the AdS/CFT correspondence. To do so, we consider the aforementioned system which is subjected to a time-dependent electric field indicating an out of equilibrium system. Defining the equilibration time t_{eq}, at which the system relaxes to its final equilibrium state after injecting the energy, we find that the rescaled equilibriation time k^{-1}t_{eq} decreases as the transition time k increases. Therefore, we expect that for sufficiently large transition time, k ->infinity, the relaxation of the system to its final equilibrium can be an adiabatic process. On the other hand, we observe a universal behavior for the fast quenches, k << 1, meaning that the rescaled equilibration time does not depend on the final value of the time-dependent electric field. Our calculations generalized to systems in various dimensions also confirm universalization process which seems to be a typical feature of all strongly coupled gauge theories that admit a gravitational dual.

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