Abstract
The infrared singularities of gravitational amplitudes are one-loop exact, in that higher-loop divergences are characterized by the exponential of the one-loop divergence. We show that the contributions to SU(N) gauge-theory amplitudes that are mostsubleading in the 1/N expansion are also one-loop exact, provided that the dipole conjecture holds. Possible corrections to the dipole conjecture, beginning at three loops, could violate one-loop-exactness, though would still maintain the absence of collinear divergences. We also demonstrate a relation between L-loop four-point \( \mathcal{N}=8 \) supergravity and mostsubleading-color \( \mathcal{N}=4 \) SYM amplitudes that holds for the two leading IR divergences, \( \mathcal{O}\left( {{1 \left/ {{{\in^L}}} \right.}} \right) \) and \( \mathcal{O}\left( {{1 \left/ {{{\in^{L-1 }}}} \right.}} \right) \), but breaks down at \( \mathcal{O}\left( {{1 \left/ {{{\in^{L-2 }}}} \right.}} \right) \).
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ArXiv ePrint: 1301.2234
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Naculich, S.G., Nastase, H. & Schnitzer, H.J. All-loop infrared-divergent behavior of most-subleading-color gauge-theory amplitudes. J. High Energ. Phys. 2013, 114 (2013). https://doi.org/10.1007/JHEP04(2013)114
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DOI: https://doi.org/10.1007/JHEP04(2013)114