# Comment on "Acceleration of particles to high energy via gravitational repulsion in the Schwarzschild field" by C. H. McGruder III

## TL;DR

This paper demonstrates through direct calculations that the so-called gravitational repulsion in the Schwarzschild field is a coordinate effect and cannot accelerate particles or be observed locally or remotely.

## Contribution

It clarifies that gravitational repulsion in Schwarzschild spacetime is a coordinate artifact, not a physical acceleration detectable by observers.

## Key findings

- Repulsion in Schwarzschild field is a coordinate effect.
- Cannot accelerate outgoing particles.
- Not detectable by local or distant observers.

## Abstract

By direct computations, we show that "repulsion" in the Schwarzschild field can not accelerate an outgoing particle, and thus represents pure coordinate effect. In other words, the repulsion can not be detected neither by local nor by distant observer.