Relativistic frequency shifts in a rotating waveguide

TL;DR

This paper investigates how rotation affects photon frequency shifts in a waveguide, revealing nonzero shifts even when source and absorber are stationary relative to the waveguide.

Contribution

It provides a detailed analysis of relativistic frequency shifts in rotating waveguides, including cases where source and absorber are at rest.

Findings

Nonzero frequency shifts occur even when source and absorber are stationary.

The frequency spectrum depends on the relative positions of source, absorber, and detector.

Rotation influences the photon absorption spectrum in the waveguide.

Abstract

A photon source is located in a rotating waveguide. An absorber with a sharp absorbing frequency absorbs some of the emitted photons. This decreases the number of photons which are detected by a detector. The frequency (energy) spectrum measured in the absorber depends on the setup (the positions of the source and the detector), and this spectrum determines the amount of absorption. The shifts are calculated for different configurations. Among other things, it is seen that even if the source and the absorber are at rest (while the waveguide is rotating), there is a nonzero frequency shift.