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arXiv 1807.04588hep-th
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超引力理论中的次导程函

The Subleading Eikonal in Supergravity Theories

Arnau Koemans Collado, Paolo Di Vecchia, Rodolfo Russo, Steven Thomas

摘要:

在本文中,我们研究了(超)引力理论中程函散射的次要贡献,特别强调了弹性和非弹性散射过程的作用。为了具体起见,我们集中讨论了在大碰撞参量$b$的限制下,在II型超引力中各种无质量粒子从一堆D $p$ -膜上的散射。我们分析了相关的场论费曼图,自然引起的弹性和非弹性过程。我们表明,在分析的情况下,领先和subleading程函只依赖于弹性过程,而非弹性过程被捕获的前因子乘以指数领先和subleading程函相位。除了传统的Feynman图计算上述,我们还提出了一种新的方法来计算振幅的领先和subleading程函相位,其中,在大$b$限制,只涉及知识的onshell的三点和四点顶点。这两种方法给出了相同的结果。此外,我们得到这些结果的另一种方式,通过计算各种单点振幅,使我们能够提取的经典解决方案的引力反作用的目标D $p$ -膜。最后,我们展示了如何我们的表达式的领导和subleading程函同意的度量和相应的偏转角的计算无质量状态沿测地线在相关的弯曲几何。

英文摘要:

In this paper we study the subleading contributions to eikonal scattering in (super)gravity theories with particular emphasis on the role of both elastic and inelastic scattering processes. For concreteness we focus on the scattering of various massless particles off a stack of D$p$-branes in type II supergravity in the limit of large impact parameter $b$. We analyse the relevant field theory Feynman diagrams which naturally give rise to both elastic and inelastic processes. We show that in the case analysed the leading and subleading eikonal only depend on elastic processes, while inelastic processes are captured by a pre-factor multiplying the exponentiated leading and subleading eikonal phase. In addition to the traditional Feynman diagram computations mentioned above, we also present a novel method for computing the amplitudes contributing to the leading and subleading eikonal phases, which, in the large $b$ limit, only involves knowledge of the onshell three and four-point vertices. The two methods are shown to give the same results. Furthermore we derive these results in yet another way, by computing various one-point amplitudes which allow us to extract the classical solution of the gravitational back reaction of the target D$p$-branes. Finally we show how our expressions for the leading and subleading eikonal agree with the calculation of the metric and corresponding deflection angle for massless states moving along geodesics in the relevant curved geometry.

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