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arXiv 1108.2227hep-th
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引力散射振幅的新表达式

New expressions for gravitational scattering amplitudes

Andrew Hodges

摘要:

本文介绍了描述和计算三级重力散射振幅的新方法。一个N=7的超对称递归,没有虚假的双极点,给出了一个更有效的方法来评估MHV振幅。递归是自然地与扭量几何,从而给出了一个新的解释的振幅。递归导致新的表达式的MHV振幅为6和7引力子,简化其对称性,并建议进一步推广。N=7的递归是有效的所有树的振幅,我们说明了它与一个简化的表达式为6引力子NMHV振幅。当MHV振幅用动量扭转子表示时,出现了进一步的新结构。

英文摘要:

New methods are introduced for the description and evaluation of tree-level gravitational scattering amplitudes. An N=7 super-symmetric recursion, free from spurious double poles, gives a more efficient method for evaluating MHV amplitudes. The recursion is naturally associated with twistor geometry, and thereby gives a new interpretation for the amplitudes. The recursion leads to new expressions for the MHV amplitudes for six and seven gravitons, simplifying their symmetry properties, and suggesting further generalization. The N=7 recursion is valid for all tree amplitudes, and we illustrate it with a simplified expression for the six-graviton NMHV amplitude. Further new structure emerges when MHV amplitudes are expressed in terms of momentum twistors.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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