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arXiv 0812.3629hep-th
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AdS/CFT的应力-能量张量

The Stress-Energy Tensor of Flavor Fields from AdS/CFT

Andreas Karch, Andy O'Bannon, Ethan Thompson

摘要:

本文利用AdS/CFT对应研究了在大Nc,大t Hooft耦合极限,重子数化学势和外加电场、磁场存在下,N=4 SU(Nc)超杨-米尔斯理论等离子体中质量N=2超多重态场的输运性质.特别地,我们计算了味场对应力-能量张量的贡献。我们发现红外发散的应力-能量张量,所产生的风味领域的恒定速率的能量和动量损失。我们调节这些分歧,并提取能量和动量损失率的分歧条款。我们还检查我们的结果在各种限制,其中的分歧是缺席。超引力对偶是一个D 7-膜系统,具有世界体积场的特殊配置,探测AdS-Schwarzschild背景。超引力计算相当于计算D 7-膜的应力-能量张量。

英文摘要:

We use the AdS/CFT correspondence to study the transport properties of massive N=2 hypermultiplet fields in an N=4 SU(Nc) super-Yang-Mills theory plasma in the large Nc, large 't Hooft coupling limit, and in the presence of a baryon number chemical potential and external electric and magnetic fields. In particular, we compute the flavor fields' contribution to the stress-energy tensor. We find infrared divergences in the stress-energy tensor, arising from the flavor fields' constant rate of energy and momentum loss. We regulate these divergences and extract the energy and momentum loss rates from the divergent terms. We also check our result in various limits in which the divergences are absent. The supergravity dual is a system of D7-branes, with a particular configuration of worldvolume fields, probing an AdS-Schwarzschild background. The supergravity calculation amounts to computing the stress-energy tensor of the D7-branes.

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