High-energy scattering in gravity and supergravity
High-energy scattering in gravity and supergravity
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DOI：
10.1103/physrevd.82.104022
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发表时间：
2010-05
影响因子：
5
通讯作者：
S. Giddings;M. Schmidt-Sommerfeld;J. Andersen
中科院分区：
文献类型：
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作者：
S. Giddings;M. Schmidt-Sommerfeld;J. Andersen
我们通过研究超普朗克极限下的散射来研究微扰引力和超引力的特征，并加强了动力学受长距离物理支配的论点。一个简单的例子捕捉方面的程函再确认表明，为什么短距离的现象，特别是，发散或nonrenormalizability不一定发挥核心作用，在这个制度。一个更深刻的问题显然是统一性。这些考虑可以通过显示已知的引力和超引力振幅具有相同的长距离行为来说明，尽管超引力的额外轻态，这在微扰振幅有限的情况下作为对长距离动力学的重要检查。我们还认为，这些考虑因素有其他重要的影响：他们阻碍了探测通过物理散射过程的渐近安全的约束现象，和超普朗克散射表现出Regge行为。这些论点尖锐的需要找到一个非微扰完成的机制，恢复在强引力制度的幺正性的重力。
We investigate features of perturbative gravity and supergravity by studying scattering in the ultra-Planckian limit, and sharpen arguments that the dynamics is governed by long-distance physics. A simple example capturing aspects of the eikonal resummation suggests why short-distance phenomena and, in particular, divergences or nonrenormalizability do not necessarily play a central role in this regime. A more profound problem is apparently unitarity. These considerations can be illustrated by showing that known gravity and supergravity amplitudes have the same long-distance behavior, despite the extra light states of supergravity, and this serves as an important check on long-range dynamics in a context where perturbative amplitudes are finite. We also argue that these considerations have other important implications: they obstruct both probing the conjectured phenomenon of asymptotic safety through a physical scattering process, and ultra-Planckian scattering exhibiting Regge behavior. These arguments sharpen the need to find a nonperturbative completion of gravity with mechanisms which restore unitarity in the strong gravity regime.