xi R phi squared non-minimal coupling, and the long range gravitational potential for different spin fields from 2-2 scattering amplitudes
Researchers investigated how a specific non-minimal coupling between curvature and a scalar field affects long-range gravitational potentials for different spin fields in perturbative quantum gravity. The leading result shows these potentials are proportional to r^-4, providing insights into deviations from classical gravity at low energies.