Abstract
We prove that if a solution of the Einstein field equations with perfect fluid source and γ law equation of state [p = (γ−1)μ] admits an Isotropic singularity, then necessarily the fluid flow is irrotational. This shows the essential equivalence of the seemingly distinct concepts of quasi-isotropic singularities and Friedrnann-like singularities of Lifshitz and Khalatnikov and Eardley, Liang and Sachs, respectively.
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Goode, S.W. Vorticity and isotropic singularities. Gen Relat Gravit 19, 1075–1082 (1987). https://doi.org/10.1007/BF00759143
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DOI: https://doi.org/10.1007/BF00759143