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Friedmann-Robertson-Walker models do not require zero active mass

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arxiv 1601.07890 v2 pith:4ZCASESR submitted 2016-01-28 astro-ph.CO gr-qc

Friedmann-Robertson-Walker models do not require zero active mass

classification astro-ph.CO gr-qc
keywords modelactiveconditionfriedmann-robertson-walkerlambdamassmeliazero
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The $R_h = ct$ cosmological model has received considerable attention in recent years owing to claims that it is favoured over the standard $\Lambda$ cold dark matter ($\Lambda$CDM) model by most observational data. A key feature of the $R_h = ct$ model is that the zero active mass condition $\rho + 3p = 0$ holds at all epochs. Most recently, Melia has claimed that this condition is a requirement of the symmetries of the Friedmann-Robertson-Walker (FRW) spacetime. We demonstrate that this claim is false and results from a flaw in the logic of Melia's argument.

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