Dark energy and the big bang
I cant help it, Im not going to look up the numbers or do any sourcing here but some of the approximations appear wrong. As I remember the theory goes... In the beginning all 4 forces (gravity, electromagnetism, weak nuclear, strong nuclear) were unified in a primordial atom of infinite heat and infinite density. In the first fraction of a second, on the order of 1/80b, gravity broke free and the universe expanded to about the size of a galaxy before the other forces broke free also some fractions of a second later. Things stayed pretty boring for the next 350,000 years as the universe remained too hot for atoms to form while expanding. Its theorized that hydrogen and helium began to form after this time. Inflation basically describes the period of time when the laws of our "now" were not in effect and allowed the universe to expand faster than the speed of light.(short version) When examining the 4 forces, gravity seems to be allot weaker than it should. For gravity to hold galaxies together, more matter is needed in most(all?) models, and gave rise to the theory of dark matter. My memory isnt perfect but I believe this to be pretty close.