Effective Field Theory Islands from Perturbative and Nonperturbative Four-Graviton Amplitudes
arXiv:2205.01655 · doi:10.1007/JHEP01(2023)113
Abstract
Theoretical data obtained from physically sensible field and string theory models suggest that gravitational Effective Field Theories (EFTs) live on islands that are tiny compared to current general bounds determined from unitarity, causality, crossing symmetry, and a good high-energy behavior. In this work, we present explicit perturbative and nonperturbative graviton scattering amplitudes and their associated low-energy expansion in spacetime dimensions to support this notion. Our new results include a first nonperturbative example consisting of a , supersymmetric field theory that is coupled weakly to gravity. We show that this nonperturbative model lies on the same islands identified using four-dimensional perturbative models based on string theory and minimally-coupled matter circulating a loop. Furthermore, we generalize the previous four-dimensional perturbative models based on string theory and minimally-coupled massive spin-0 and spin-1 states circulating in the loop to dimensions. Remarkably, we again find that the low-energy EFT coefficients lie on small islands. These results offer a useful guide towards constraining possible extensions of Einstein gravity.
arXiv comment26 pages, 6 figures, 11 ancillary files
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