ASTRON 2B03 Lecture Notes - Lecture 28: Nucleosynthesis, Big Crunch, Polar Vortex
2 Dec 2016
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Document Summary
Cosmic microwave radiation: radiation from recombination stage in big bang. 3 factors determine the eventual fate of the universe: universe"s overall shape/geometry, how much dark energy it contains, equation of state determines how the density of the dark energy responds to universe expansion. Universe continues to expand since big bang, though at slower rate than during inflation gravity of all matter in the universe is slowing down the expansion, and could possibly reverse it in the future. 2 possibilities: universe contains enough mass (critical mass) for gravity to reverse expansion, leading to the big crunch where the university collapses onto itself, universe will continue to expand forever. If universe has many dark energy, then expansion is likely to continue forever. Light likes to interact with free electrons (ions) If you were there at early universe, you would see the universe as being very foggy (scattered light) Present cold and sparce stars, galaxies, clusters of galaxies.
