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

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

2008-12-18

arxiv.org/abs/0812.3629v2

JHEP 0904:021,2009

Physics

High Energy Physics

High Energy Physics - Theory

32 pages; v2, added one footnote in section 2.2, added one reference, version published in JHEP

Scientific paper

10.1088/1126-6708/2009/04/021

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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