Comment on ``Singularity-free Cosmological Solutions with Non-rotating Perfect Fluids''

TL;DR

This paper challenges a previous theorem claiming only Ruiz-Senovilla family models are non-singular, providing a counterexample and identifying flaws in the original proof.

Contribution

It presents a counterexample to Raychaudhuri's theorem, showing that non-singular cosmological models outside the Ruiz-Senovilla family exist.

Findings

Counterexample disproves the theorem

Identifies flaws in the original proof

Expands understanding of non-singular cosmological models

Abstract

A theorem stated by Raychaudhuri which claims that the only physical non-singular cosmological models are comprised in the Ruiz-Senovilla family is shown to be incorrect. An explicit counterexample is provided and the failure of the argument leading to the theorem is explicitly pointed out.