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19 Big-Bang cosmology 5 19 1 5 Standard Model solutions: Much of the history of the Universe in the standard Big-Bang model can be easily described by assuming that either matter or radiation dominates the total energy density During in?ation and again today the expansion rate for the Universe is accelerating, and
Big-BangCosmology 21 Big-Bang Cosmology RevisedAugust2019byK A Olive(MinnesotaU )andJ A Peacock(EdinburghU ) 21 1 Introduction to Standard Big-Bang Model The observed expansion of the Universe [1–3] is a natural (almost inevitable) result of any homogeneous and isotropic cosmological model based on general relativity However, by itself,
Aug 27, 2020 · Big-BangCosmology 22 Big-Bang Cosmology RevisedAugust2019byK A Olive(MinnesotaU )andJ A Peacock(EdinburghU ) 22 1 Introduction to Standard Big-Bang Model The observed expansion of the Universe [1–3] is a natural (almost inevitable) result of any homogeneous and isotropic cosmological model based on general relativity However, by itself,
1 22 Big-BangCosmology 22 Big-Bang Cosmology RevisedAugust2021byK A Olive(MinnesotaU )andJ A Peacock(EdinburghU ) 22 1 Introduction to the standard big-bang model The observed expansion of the Universe [1–3] is a natural (almost inevitable) result of any homogeneous and isotropic cosmological model based on general relativity However, by
Hot Big Bang predicts this evolution: Initially hot plasma of protons, neutrons, electrons and photons, like a fog When the universe grows, it cools down, when it is cool enough neutral stable atoms can form (4,000 K or after 400,000 years) These atoms no longer absorb all the light (thermal radiation) The universe becomes transparent instead
Big Bang Model Brief history: time 10?43 s Planck time t p Don’t know what precedes this Need a quantum theory of gravity 10?35 s Strong nuclear force decouples from electroweak Inflation begins - rapid exponential growth Most quarks and antiquarks annihilate Small asymmetry => some quarks remain Baryon (made of quarks) to photon