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The Structure of Multiloop Amplitudes in Gauge and Gravity Theories

Research paper by Z. Bern, J. J. M. Carrasco, H. Johansson

Indexed on: 24 Jul '10Published on: 24 Jul '10Published in: High Energy Physics - Theory



Abstract

We review the recently discovered duality between color and kinematics in gauge theories. This duality leads to a remarkably simple double-copy relation between diagrammatic numerators of gravity scattering amplitudes and gauge-theory ones. We summarize nontrivial evidence that the duality and double-copy property holds to all loop orders. We also comment on other developments, including a proof that the gauge-theory duality leads to the gravity double-copy property, and the identification of gauge-theory Lagrangians whose double copies yield gravity Lagrangians.