ASTRON 2B03 Lecture Notes - Observable Universe, Flatness Problem, Coordinate System
25 Sep 2013
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Document Summary
Big bang universe started out small and hot. Foggy to transparent key prediction: also, big bang nucleosynthesis, expansion . Balance between stuff in the universe vs energy in the expansion: if more energy than gravity (matter), then expansion forever. if matter more, it might stop, dark energy complicates this. Very good evidence that we live ina universe that is spatially flat. And we have lots of matter, but not so much that it will recollapse on itself. We live in a universe that is expanding forever. 1 thing that we haven"t spoken about first fraction of a second. So far nucleosynthesis, cbr predicted observed. Inflation era of universe topic of the day. Not a fundamental part of the big bang but an addon. Big bang 1950s millionth of a second a. b. Very soon particles named different than before. Few minutes old to 300,000 - fundamental particles were protons, nuetrons, electrons.
