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      Generic multiloop methods and application to N=4 super-Yang-Mills

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          Abstract

          We review some recent additions to the tool-chest of techniques for finding compact integrand representations of multiloop gauge-theory amplitudes - including non-planar contributions - applicable for N=4 super-Yang-Mills in four and higher dimensions, as well as for theories with less supersymmetry. We discuss a general organization of amplitudes in terms of purely cubic graphs, review the method of maximal cuts, as well as some special D-dimensional recursive cuts, and conclude by describing the efficient organization of amplitudes resulting from the conjectured duality between color and kinematic structures on constituent graphs.

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          Perturbative Quantum Gravity as a Double Copy of Gauge Theory

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            New Relations for Gauge-Theory Amplitudes

            We present an identity satisfied by the kinematic factors of diagrams describing the tree amplitudes of massless gauge theories. This identity is a kinematic analog of the Jacobi identity for color factors. Using this we find new relations between color-ordered partial amplitudes. We discuss applications to multi-loop calculations via the unitarity method. In particular, we illustrate the relations between different contributions to a two-loop four-point QCD amplitude. We also use this identity to reorganize gravity tree amplitudes diagram by diagram, offering new insight into the structure of the KLT relations between gauge and gravity tree amplitudes. This can be used to obtain novel relations similar to the KLT ones. We expect this to be helpful in higher-loop studies of the ultraviolet properties of gravity theories.
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              Gravity as the square of gauge theory

                Author and article information

                Journal
                16 March 2011
                2012-01-16
                Article
                10.1088/1751-8113/44/45/454004
                1103.3298
                ad7dde19-0714-49ce-9ca2-fa77451153d9

                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

                History
                Custom metadata
                SU-ITP-11/07; Saclay-IPhT-T11/029
                42 pages, 18 figures, invited review for a special issue of Journal of Physics A devoted to "Scattering Amplitudes in Gauge Theories", v2 minor corrections, v3 added references
                hep-th hep-ph

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