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arXiv 0902.0364cond-mat.str-elhep-th
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U(1)流在非限定量子临界点的普适性质:与规范/引力对偶预言的比较

Universal properties of the U(1) current at deconfined quantum critical points: comparison with predictions from gauge/gravity duality

Flavio S. Nogueira

摘要:

二维SU(N)反铁磁体的退禁闭量子临界点由$d=2+1$时空中的阿贝尔Higgs模型控制,该时空具有$N$复标量场.在这方面,我们推导出$2\leq d\leq 4$的U(1)电流的中心荷的精确公式在量子临界规范耦合,并比较它与相应的结果使用规范引力对偶。对于$d=2+1$,存在着显著的相似性。在这种情况下,电流关联函数的振幅具有与规范-重力对偶性所预测的相同的形式。我们还比较了有限温度下的电荷磁化率在大的$N$限制与规范重力对偶预测的结果。我们的研究结果表明,凝聚态系统在量子临界可能提供有趣的定量测试的规范引力的对偶性,即使在没有超对称性。

英文摘要:

The deconfined quantum critical point of a two-dimensional SU(N) antiferromagnet is governed by an Abelian Higgs model in $d=2+1$ spacetime dimensions featuring $N$ complex scalar fields. In this context, we derive for $2\leq d\leq 4$ an exact formula for the central charge of the U(1) current in terms of the gauge coupling at quantum criticality and compare it with the corresponding result obtained using gauge-gravity duality. There is a remarkable similarity precisely for $d=2+1$. In this case the amplitude of the current correlation function has the same form as predicted by the gauge-gravity duality. We also compare finite temperature results for the charge susceptibility in the large $N$ limit with the result predicted by the gauge-gravity duality. Our results suggest that condensed matter systems at quantum criticality may provide interesting quantitative tests of the gauge-gravity duality even in absence of supersymmetry.

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