On the GR-speeds of light and particles (A remembrance of things past)

TL;DR

This paper emphasizes that general relativity does not impose universal speed limits on light and particles, illustrating this fundamental point with four examples often overlooked in the literature.

Contribution

It highlights the overlooked fact that GR allows for unbounded speeds, supported by four illustrative examples.

Findings

No universal speed limit in GR for light and particles

Four examples demonstrate the possibility of arbitrarily high speeds

Neglected aspect of GR's implications on speed limits

Abstract

There are no limits for the speeds of light and particles in general relativity (GR). Four examples illustrate this basic result, which is too often neglected.