Retarded Fields of Null Particles and the Memory Effect

TL;DR

This work analyzes retarded solutions for scalar, electromagnetic, and linearized gravitational fields in Minkowski space with a null-particle source, using a finite-time cutoff and two limiting procedures to isolate the radiative $1/r$ tails and curvature. It shows that a finite-time creation produces memory in gravity and velocity/kick effects in scalar and EM fields, whereas an eternal null source yields an Aichelburg–Sexl curvature without memory, implying that memory originates from emission events or additional incoming radiation rather than mere passage to null infinity. The results unify the treatment across spin-0, spin-1, and spin-2 fields and clarify the physical origin of memory effects, with implications for the interpretation of Christodoulou's nonlinear memory and the role of asymptotic flatness. Overall, memory is tied to the burst of radiation associated with creation or external radiation, not simply to null infinity flux.

Abstract

We consider the retarded solution to the scalar, electromagnetic, and linearized gravitational field equations in Minkowski spacetime, with source given by a particle moving on a null geodesic. In the scalar case and in the Lorenz gauge in the electromagnetic and gravitational cases, the retarded integral over the infinite past of the source does not converge as a distribution, so we cut off the null source suitably at a finite time $t_0$ and then consider two different limits: (i) the limit as the observation point goes to null infinity at fixed $t_0$, from which the ``$1/r$'' part of the fields can be extracted and (ii) the limit $t_0 \to - \infty$ at fixed ``observation point.'' The limit (i) gives rise to a ``velocity kick'' on distant test particles in the scalar and electromagnetic cases, and it gives rise to a ``memory effect'' (i.e., a permanent change in relative separation of two test particles) in the linearized gravitational case, in agreement with previous analyses. Although the second limit does not exist for the Lorenz gauge potentials in the electromagnetic and linearized gravitational cases, we obtain a well defined distributional limit for the electromagnetic field strength and for the linearized Riemann tensor. In the gravitational case, this limit agrees with the Aichelberg-Sexl solution, but there is no ``memory effect'' associated with this limiting solution. This strongly suggests that the memory effect---including nonlinear memory effect of Christodoulou---should not be interpreted as arising simply from the passage of (effective) null stress energy to null infinity but rather as arising from a ``burst of radiation'' associated with the creation of the null stress-energy (as in case (i) above) or, more generally, with radiation present in the spacetime that was not ``produced'' by the null stress-energy.