Download Scattering Amplitudes and Wilson Loops in Twistor Space by Mathew Richard Bullimore PDF

By Mathew Richard Bullimore

Scattering amplitudes are basic and wealthy observables in quantum box thought. in keeping with the statement that, for massless debris of spin-one or extra, scattering amplitudes are a lot less complicated than anticipated from conventional Feynman diagram suggestions, the extensive goal of this paintings is to appreciate and take advantage of this hidden constitution. It makes use of equipment from twistor thought to supply new insights into the correspondence among scattering amplitudes in supersymmetric Yang-Mills idea and null polygonal Wilson loops. by way of also exploiting the symmetries of the matter, the writer succeeds in constructing new methods of computing scattering amplitudes.

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Scattering Amplitudes and Wilson Loops in Twistor Space

Scattering amplitudes are basic and wealthy observables in quantum box idea. in line with the commentary that, for massless debris of spin-one or extra, scattering amplitudes are a lot easier than anticipated from conventional Feynman diagram recommendations, the vast target of this paintings is to appreciate and take advantage of this hidden constitution.

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18) In addition, we have the Poincaré and conformal supercharges q αa = λiα ηia q¯aα˙ = i i ∂ ∂ηia ηia ∂ . 19) i Invariance under the translation generator P α α˙ implies that amplitudes are proportional to the momentum conserving delta-function. Similarly, invariance under the supersymmetry generator Q α a requires the presence of a fermionic supermomentum conserving delta-function. In addition, the correct weight under little group rescalings may be obtained pulling out the Parke-Taylor denomenator, as follows Mn (λ j , λ˜ j , η j ) = δ (0|8) n j=1 λ j η j λ1 λ2 λ2 λ3 · · · λn λ1 An (λ j , λ˜ j , η j ).

In this manner we are expanding around the self-dual sector. 71) This is indeed the unique, local, gauge invariant space-time action that is invariant under superconformal symmetries PSU(2,2|4). 4 The Twistor Action We begin with the self-dual sector of N = 4 supersymmetric Yang-Mills theory. In the previous section, we explained that classical solutions are obtained from holomorphic vector bundles on supertwistor space, which are characterised by the vanishing of the (0, 2)-component of the curvature ¯ + A ∧ A = 0.

Forward terms’ which appear only for loop integrands. This is illustrated in Fig. 1). Since momentum twistors manifest momentum conservation and the on-shell conditions, they are completely unconstrained variables. Thus for constructing recursion relations we may choose any deformation of the momentum twistor polygon = L ,R L R + I Fig. 4) There are two particularly convenient choices of momentum twistor deformations that have been employed in the literature: 1. All-line deformation: Z j (z) = Z j − zr j Z∗ .

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