Force Behaviour in Radiation-Dominated Friedmann Universe

TL;DR

This paper examines the force four-vector and momentum in a radiation-dominated Friedmann universe, comparing it with matter-dominated models to assess physical plausibility.

Contribution

It provides a detailed analysis of force behavior in radiation-dominated Friedmann universes, extending previous work on matter-dominated models.

Findings

Results are physically acceptable and consistent with theoretical expectations.

Comparison shows differences in force behavior between radiation- and matter-dominated models.

Abstract

We consider radiation-dominated Friedmann universe and evaluate its force four-vector and momentum. We analyse and compare the results with the already evaluated for the matter-dominated Friedmann model. It turns out that the results are physically acceptable.