Comment on "Observing a wormhole"

TL;DR

This paper critically examines a previous claim about observing wormholes through star trajectories, concluding that the effect is unobservable within the approximations used, regardless of measurement accuracy.

Contribution

It provides a critical analysis showing that the proposed observational effect of wormholes is unobservable under the original approximation assumptions.

Findings

The effect is unobservable within the approximation used

Measurement accuracy does not enable detection of the effect

The critique clarifies limitations of previous proposals

Abstract

In their recent paper Dai and Stojkovic [arXiv:1910.00429] discuss an interesting possibility: a star near a wormhole mouth may gravitationally feel an object located near the other mouth. This means that a star's trajectory may tell an observer that the star orbits a wormhole mouth and not a black hole. I argue that within the approximation used in the paper the effect is, in fact, unobservable irrespective of how accurate the measurements are.