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Loop amplitudes in an extended gravity theory. (English) Zbl 1390.81663
Summary: 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.
MSC:
81V17 Gravitational interaction in quantum theory
81T13 Yang-Mills and other gauge theories in quantum field theory
81U20 \(S\)-matrix theory, etc. in quantum theory
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