We give a systematic analysis of forward scattering in (3+1)-dimensional quantum gravity, at center of mass energies comparable or larger than the Planck energy. We show that quantum gravitational effects in this kinematical regime are described by means of a topological field theory. We find that the scattering amplitudes display a universal behaviour similar to two-dimensional string amplitudes, thereby recovering results obtained previously by 't Hooft. Finally, we discuss the two-particle process in some detail.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics