I was just reading this wiki page: http://en.wikipedia.org/wiki/Timeline_of_the_Big_Bang and was wondering where can I find the seminal papers or books that derived these amazingly exact figures of all these nucleation and decoupling, etc. events at such specific instances (e.g., 10^-43s, 10^-8s, 1 second, 10 seconds, etc.) And then after that, we have "approximately 70k years, approximately 377k years, etc., for later events. Why so specific in the beginning, and not so much later? What is the mathematical model that drives this cosmological model and how can it be so precise? Is it general relativity per se or some derivative theory thereof? Quantum field theory?