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arXiv 1111.1675hep-thhep-ph
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N >= 4超重力与次铅色SYM振幅的线性关系

Linear relations between N >= 4 supergravity and subleading-color SYM amplitudes

Stephen G. Naculich, Horatiu Nastase, Howard J. Schnitzer

摘要:

超重力振幅的红外发散比平面SYM振幅的红外发散不那么严重,并且可以与那些在1/N展开中最次领先的次领先色SYM振幅相媲美,即L环振幅的O(1/λ ^L)。我们导出了N = 4,5,6超引力的单圈和双圈四点振幅和单圈五点振幅之间的线性关系,以及N = 0,1,2 SYM理论中类似振幅的最次导色贡献,推广了N = 8超引力振幅的早期结果.我们的工作依赖于N >= 4的超引力和平面SYM振幅之间的线性关系,这些关系是最近利用引力的双拷贝性质和规范理论的色运动学对偶性导出的。

英文摘要:

The IR divergences of supergravity amplitudes are less severe than those of planar SYM amplitudes, and are comparable to those subleading-color SYM amplitudes that are most subleading in the 1/N expansion, namely O(1/epsilon^L) for L-loop amplitudes. We derive linear relations between one- and two-loop four-point amplitudes and one-loop five-point amplitudes of N = 4, 5, and 6 supergravity and the most-subleading-color contributions of the analogous amplitudes of N = 0, 1, and 2 SYM theory, extending earlier results for N = 8 supergravity amplitudes. Our work relies on linear relations between N >= 4 supergravity and planar SYM amplitudes that were recently derived using the double-copy property of gravity, and color-kinematic duality of gauge theories.

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