Soft Photons, Soft Gravitons and Decoherence

Central to the solution of the infrared catastrophe of quantum electrodynamics and perturbative quantum gravity is the idea that detection apparatus inevitably have limited resolution and, in any scattering process, an infinite number of arbitrarily soft photons and gravitons are produced and escape detection. Photons and gravitons have polarizations and momenta and one might suspect that those which escape can carry away a significant amount of information. In this talk, I will  examine the question as to the quantity of this information loss,  its consequences.
Leinweber Center for Theoretical Physics,
Nov 2, 2017, 5:41 AM