What is the equation to calculate the evolution of the proportion of dark energy and matter density over the age of the universe?

We know ~ 7 Gyrs ago when omega_dark energy > .5 omega_matter, the universe started to expand acceleratingly. About 4 Gyrs ago, omega_dark energy = omega_ matter. Now, omega_dark energy = 2.3...

19 December 2018 8,387 15 View