General Relativity: An Introduction for Physicists · Problem 15.6

Cosmological models — Hobson, Efstathiou & Lasenby

Physics · present-day-scale-factor

Problem

Show that the present-day value of the scale factor of the universe may be written as R0=cH0(kΩk,0)1/2.R_0 = \frac{c}{H_0}\left(\frac{k}{\Omega_{k,0}}\right)^{1/2}. What value does R0R_0 take in a spatially flat universe?

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