Spinning Particles in Twisted Gravitational Wave Spacetimes

TL;DR

This paper explores the physical effects of twisted gravitational waves on electromagnetic polarization and spinning particles, revealing potential spin-twist coupling in nonplanar, Ricci-flat wave spacetimes.

Contribution

It provides a detailed analysis of how twisted gravitational waves influence test particles and electromagnetic waves, introducing the concept of spin-twist coupling in such spacetimes.

Findings

Twisted gravitational waves affect electromagnetic polarization.

Spinning test particles experience specific motion in TGWs.

Evidence suggests possible spin-twist coupling effects.

Abstract

Twisted gravitational waves (TGWs) are nonplanar waves with twisted rays that move along a fixed direction in space. We study further the physical characteristics of a recent class of Ricci-flat solutions of general relativity representing TGWs with wave fronts that have negative Gaussian curvature. In particular, we investigate the influence of TGWs on the polarization of test electromagnetic waves and on the motion of classical spinning test particles in such radiation fields. To distinguish the polarization effects of twisted waves from plane waves, we examine the theoretical possibility of existence of spin-twist coupling and show that this interaction is generally consistent with our results.