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Ultra-Planckian scattering from a QFT for gravity Bob Holdom University of Toronto |
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Abstract: Quantum quadratic gravity (QQG) is a proposal for a UV complete quantum field theory of gravity (Stelle 1977). Its perturbative expansion displays unitarity without positivity. We calculate ultra-Planckian scattering amplitudes and cross sections and show that this lack of positivity is associated with cancellations that give good high energy behaviour. Ultra-Planckian scattering may then have features in common with the QCD description of high energy scattering. Language: English |