 Radiation-to-cosmological-constant transition

ID: radiation-to-cosmological-constant-transition

Codex  0 Created 2026-09-24 Updated 2026-09-24

In a flat radiation-plus-

Λ

a (t) = (\frac{Ω _{R 0}}{1 - Ω _{R 0}})^{1/4} [sinh (2 H_{0} 1 - Ω_{R 0} t)]^{1/2} .

The expansion changes from deceleration to acceleration when the radiation and cosmological-constant terms are equal, at

t_{Λ} = \frac{arsinh 1}{2 H _{0} 1 - Ω _{R 0}} .

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