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arXiv 0908.1272hep-th
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渐近Lifshitz时空的R^2修正

R^2 Corrections to Asymptotically Lifshitz Spacetimes

Da-Wei Pang

摘要:

通过在有效作用量中加入Gauss-Bonnet项,研究了对五维渐近Lifshitz时空的$R^{2}$修正.对于零温度背景,我们得到了纯Gauss-Bonnet引力和含有非平凡物质的Gauss-Bonnet引力的精确解。在后一种情况下,动力学指数经历有限重整化。对于有限温度背景,我们微扰地得到了黑膜解,并计算了剪切粘度与熵密度之比$η/s$。KSS界限仍然被违反,但与相对论性对应物不同,边界场论的因果关系不能被视为约束。

英文摘要:

We study $R^{2}$ corrections to five-dimensional asymptotically Lifshitz spacetimes by adding Gauss-Bonnet terms in the effective action. For the zero-temperature backgrounds we obtain exact solutions in both pure Gauss-Bonnet gravity and Gauss-Bonnet gravity with non-trivial matter. The dynamical exponent undergoes finite renormalization in the latter case. For the finite-temperature backgrounds we obtain black brane solutions perturbatively and calculate the ratio of shear viscosity to entropy density $η/s$. The KSS bound is still violated but unlike the relativistic counterparts, the causality of the boundary field theory cannot be taken as a constraint.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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