Wave Packets Losing Their Covariance
arXiv:1905.09004
Abstract
In neutrino physics, it is sometimes assumed that all wave packets must transform covariantly as Lorentz vectors. We show in a simple example that even if the initial conditions of a wave packet are covariant, then evolution in a relativistic interacting theory followed by a measurement of entangled particles can lead to a wave packet which is no longer covariant.
12 pages, 3 PDF figures, v2 expanded discussion of Daya Bay