Heavy quark diffusion in strongly coupled N=4 Yang-Mills theory

被引：375

作者：

Casalderrey-Solana, Jorge ^{[1
]}

Teaney, Derek

机构：

[1] SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11764 USA

[2] Arkansas State Univ, Dept Chem & Phys, State Univ, AR 72467 USA

来源：

PHYSICAL REVIEW D | 2006年 / 74卷 / 08期

关键词：

D O I：

10.1103/PhysRevD.74.085012

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We express the heavy quark diffusion coefficient as the temporal variation of a Wilson line along the Schwinger-Keldysh contour. This generalizes the classical formula for diffusion as a force-force correlator to a non-Abelian theory. We use this formula to compute the diffusion coefficient in strongly coupled N=4 Yang-Mills theory by studying the fluctuations of a string in AdS(5)xS(5). The string solution spans the full Kruskal plane and gives access to contour correlations. The diffusion coefficient is D=2/root lambda pi T and is therefore parametrically smaller than momentum diffusion, eta/(e+p)=1/4 pi T. The quark mass must be much greater than T root lambda in order to treat the quark as a heavy quasiparticle. The result is discussed in the context of the Relativistic Heavy Ion Collider (RHIC) experiments.

引用

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