Loop amplitudes in an extended gravity theory

Author name not available (Why is that?)

Abstract: We extend the

S

-matrix of gravity by the addition of the minimal three-point amplitude or equivalently adding

R^{3}

terms to the Lagrangian. We demonstrate how Unitarity can be used to simply examine the renormalisability of this theory and determine the

R^{4}

counter-terms that arise at one-loop. We find that the combination of

R^{4}

terms that arise in the extended theory is complementary to the

R^{4}

counter-term associated with supersymmetric Lagrangians.

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