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arXiv 1202.6635hep-th
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解决Lifshitz Horizons问题

Resolving Lifshitz Horizons

Sarah Harrison, Shamit Kachru, Huajia Wang

摘要:

通过AdS/CFT对应,将有限电荷密度下的场论基态映射到极值黑膜解.在这种背景下,对简单引力+物质系统的研究已经发现了广泛的新的极端几何类型。具有非平凡动力学临界指数$z \neq 1$的表征场论的Lifshitz度量在掺杂全息玩具模型中成为一个共同的端点。然而,利夫希茨视界表现出温和的奇异行为-而曲率不变量是有限的,有分歧的潮汐力。在这里,我们表明,在一些最简单的情况下,出现的Lifshitz度量,爱因斯坦-麦克斯韦-爱因斯坦理论,通用的校正导致更换的Lifshitz度量,在深红外,由重新出现的$AdS_2 \times R^2$几何。因此,至少在这些情况下,利弗席兹标度在很宽的能量标度范围内表征了物理学,但是温和的奇点被量子或弦效应治愈了。

英文摘要:

Via the AdS/CFT correspondence, ground states of field theories at finite charge density are mapped to extremal black brane solutions. Studies of simple gravity + matter systems in this context have uncovered wide new classes of extremal geometries. The Lifshitz metrics characterising field theories with non-trivial dynamical critical exponent $z \neq 1$ emerge as one common endpoint in doped holographic toy models. However, the Lifshitz horizon exhibits mildly singular behaviour - while curvature invariants are finite, there are diverging tidal forces. Here we show that in some of the simplest contexts where Lifshitz metrics emerge, Einstein-Maxwell-dilaton theories, generic corrections lead to a replacement of the Lifshitz metric, in the deep infrared, by a re-emergent $AdS_2 \times R^2$ geometry. Thus, at least in these cases, the Lifshitz scaling characterises the physics over a wide range of energy scales, but the mild singularity is cured by quantum or stringy effects.

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