Bonus Scaling and BCFW in N=7 Supergravity
Date Issued
2015
Date
2015
Author(s)
Liu, Chun-Yu
Abstract
We review some ideas of scattering amplitudes. The review consists of two parts. In Part I, we review the definition of scattering amplitudes and spinor helicity. We use the technology of spinor helicity to represent scattering amplitudes in Yang-Mills theory. In part II, we review supersymmetry. The review will be on a basic level to introduce superamplitudes. We then introduce supergravity amplitudes. After introducing amplitudes, we search for natural building blocks for supergravity amplitudes in part III. We want to show a systematic way to find the building blocks which are term-by-term bonus z^(-2) large momentum scaling just like amplitudes. For a given choice of deformation legs, we present such an expansion in the form of the Britto, Cachazo, Feng and Witten recursion relation in N=7 supergravity based on a special shift. We will show that this improved scaling behavior, with respect to the fully N=8 representation, is due to its automatic incorporation of the so called bonus relations.
Subjects
Scattering amplitudes
Spinor helicity
Recursion relations Supersymmetry
Supergravity
Type
thesis
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