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arXiv 1202.2085hep-th
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黑膜视界的电荷驱逐和平面全息量子临界性

Charge Expulsion from Black Brane Horizons, and Holographic Quantum Criticality in the Plane

Eric D'Hoker, Per Kraus

摘要:

在5+1维Einstein引力理论中,通过全息方法建立了2+1维的量子临界行为,其中规范势形式为秩1和秩2。这些场通过强度为k的三线性Chern-Simons项相互耦合。量子相变的物理驱动力来自于电荷从黑膜视界内部到外部的驱逐,在那里它被规范场携带,由于陈-西蒙斯相互作用而获得电荷。在临界值k=k_c、零温度和任何有限的磁场下,红外行为由近水平Lifshitz几何控制。相关的动力学标度指数取决于磁场。当k<k_c时,向低温方向的流动由一个Reissner-Nordstrom类黑膜控制,该膜在零温时的电荷密度和熵密度都不为零。当k > k_c时,红外流是朝向AdS_6中的纯磁膜的。它的近视界几何是AdS_4 \times R^2,因此熵密度随温度平方地消失,所有的电荷都由视界外的规范场携带。

英文摘要:

Quantum critical behavior in 2+1 dimensions is established via holographic methods in a 5+1-dimensional Einstein gravity theory with gauge potential form fields of rank 1 and 2. These fields are coupled to one another via a tri-linear Chern-Simons term with strength k. The quantum phase transition is physically driven by the expulsion of the electric charge from inside the black brane horizon to the outside, where it gets carried by the gauge fields which acquire charge thanks to the Chern-Simons interaction. At a critical value k=k_c, zero temperature, and any finite value of the magnetic field, the IR behavior is governed by a near-horizon Lifshitz geometry. The associated dynamical scaling exponent depends on the magnetic field. For k<k_c, the flow towards low temperature is governed by a Reissner-Nordstrom-like black brane whose charge and entropy density are non-vanishing at zero temperature. For k > k_c, the IR flow is towards the purely magnetic brane in AdS_6. Its near-horizon geometry is AdS_4 \times R^2, so that the entropy density vanishes quadratically with temperature, and all charge is carried by the gauge fields outside of the horizon.

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