arXiv 0711.35322007-11hep-th

有限温度下${\cal N}=4$超级Yang-Mills中的胶子散射

Gluon scattering in ${\cal N}=4$ Super Yang-Mills at finite temperature

Katsushi Ito, Horatiu Nastase, Koh Iwasaki

备注：: 33 pages, 9 figures; clarifications of some points added, reference added
发表信息：: Prog.Theor.Phys.120:99-128,2008
DOI：: 10.1143/PTP.120.99

摘要：

我们将Alday和Maldacena的AdS/CFT公式推广到有限温度的$T$，从弦论出发定义了强耦合下${\cal N}=4$中胶子散射的振幅.它是由生活在AdS空间中黑洞的T-对偶视界上的类光“威尔逊圈”定义的。与零温度情况不同，这不同于定义在AdS黑洞度规边界处的Wilson环轮廓，因此在有限$T$处，胶子散射振幅与威尔逊圈之间没有关系。本文用截断正则化和广义维正则化方法计算了低能胶子（$E<T$）与高能胶子（$E\gg T$）强耦合下的前向散射振幅。在弦论中，广义维数正则化被定义为IR修正的降维。在此计算中，相应的威尔逊圈与有限温度${\cal N}=4$ SYM等离子体的喷注猝灭参数有关，而胶子散射振幅与粘滞系数有关.

英文摘要：

We extend the AdS/CFT prescription of Alday and Maldacena to finite temperature $T$, defining the amplitude for gluon scattering in ${\cal N}=4$ Super Yang-Mills at strong coupling from string theory. It is defined by a lightlike ''Wilson loop'' living at the horizon of the T-dual to the black hole in AdS space. Unlike the zero temperature case, this is different from the Wilson loop contour defined at the boundary of the AdS black hole metric, thus at finite $T$ there is no relation between gluon scattering amplitudes and the Wilson loop. We calculate the amplitude at strong coupling for forward scattering of a low energy gluon ($E<T$) off a high energy gluon ($E\gg T$) in both cut-off and generalized dimensional regularization. The generalized dimensional regularization is defined in string theory as an IR modified dimensional reduction. For this calculation, the corresponding usual Wilson loop is related to the jet quenching parameter of the finite temperature ${\cal N}=4$ SYM plasma, while the gluon scattering amplitude is related to the viscosity coefficient.

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摘要：

英文摘要：

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