On Negative Mass Cosmology in General Relativity

TL;DR

This paper critically examines negative mass cosmology within General Relativity, highlighting the need for fine-tuning and more rigorous theory to make it compatible with current cosmological observations.

Contribution

It provides a detailed critique of negative mass cosmology, emphasizing the necessity for better theoretical foundations and addressing fine-tuning issues.

Findings

Negative mass models require fine-tuning to match observations

Current predictions are incompatible without adjustments

More rigorous theoretical development is needed

Abstract

In this Letter we present strong arguments in favour of thoroughly revising the negative mass cosmology (NMC), which has been proposed as a simple alternative explanation of dark energy and dark matter effects, within the framework of General Relativity. We show that there are various physical predictions in this model which require fine-tuning in order to make them compatible with current cosmological surveys. In this way, the original motivation of the NMC model becomes obscured due to the imposition of fine-tuned unknown variables. We conclude that a more rigorous theoretical treatment is needed in order to make the NMC a viable cosmological model.