Causality, renormalizability and ultra-high energy gravitational scattering
Causality, renormalizability and ultra-high energy gravitational scattering
The amplitude A(s,t) for ultra-high energy scattering can be found in the leading eikonal approximation by considering propagation in an Aichelburg-Sexl gravitational shockwave background. Loop corrections in the QFT describing the scattered particles are encoded for energies below the Planck scale in an effective action which in general exhibits causality …