Hubble parameter for constant-equation-of-state components

In a spatially flat universe containing components with constant

w_{i}

,

H (z) = H_{0} [\sum_{i} Ω_{i, 0} (1 + z)^{3 (1 + w_{i})}]^{1/2} .

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Past exam of the mathematics course of the University of Cambridge / 2024 / iii / Paper 310 / 1 / a / Solution

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