Abstract
A conjecture stated by Raychaudhuri which claims that the only physical perfect fluid non-rotating non-singular cosmological models are comprised in the Ruiz–Senovilla and Fernández–Jambrina families is shown to be incorrect. An explicit counterexample is provided and the failure of the argument leading to the result is explicitly pointed out.
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Fernández–Jambrina, L. Singularity-free cosmological solutions with non-rotating perfect fluids. Gen Relativ Gravit 37, 421–424 (2005). https://doi.org/10.1007/s10714-005-0030-2
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DOI: https://doi.org/10.1007/s10714-005-0030-2