Velocity memory effect without soft particles

TL;DR

This paper demonstrates the existence of a velocity memory effect in a 3D gravity background with propagating torsion, challenging the notion that soft particles are necessary for such effects.

Contribution

It reveals the velocity memory effect in a 3D gravity setting with propagating torsion, without relying on soft particles, which is a novel insight.

Findings

Velocity memory effect exists in 3D gravity with torsion

Contradicts the belief that soft particles are needed for memory effects

Provides new understanding of geodesic behavior in torsional backgrounds

Abstract

We study the behavior of geodesics in the plane-fronted wave background of the three-dimensional (3D) gravity with propagating torsion, which possesses only massive degrees of freedom. We discover the velocity memory effect, in contrast to the current belief that its existence is due to the presence of soft particles.