24. Cosmological history of our universe, UPDATED MAR 2025.

Expansion of the Universe (Cosmology) section 24. Cosmological history of our universe, UPDATED MAR 2025. 53 minutes. The lecture script for main course (not supplemental) videos is available here: https://drive.google.com/file/d/1BheW... , updated March 15, 2025. Note that the transcript provided by YouTube is automatically generated and may not be correct but the lecture script is what I used to create the video. Subsections: Planck time 5.4e-44 seconds after Big Bang 4:05 1e-36 s 10:41 grand unification symmetry breaking Start of cosmic inflation 15:00 End of cosmic inflation and reheating 19:51 1e-32 s 21:31 1e-16 s 22:42 Temperature graph 23:29 1e-12 s 25:13 electroweak symmetry breaking; Higgs field 1e-6 s 28:56 quark-gluon plasma 1e-4 s 30:26 protons and antiprotons 1e-3 s 32:39 baryogenesis 1 s 34:36 neutrino decoupling 2 s 37:00 start of Big Bang Nucleosynthesis (BBN) 10 s 39:43 leptogenesis 5 minutes 41:04 end of Big Bang Nucleosynthesis 20 years 41:23 cold dark matter 50,000 y 42:10 matter dominated expansion 220,000 - 370,000 y 43:26 recombination and CMB last scattering. Start of Dark Ages. 50 My 45:14 first stars. Start of Reionization. 1.2 Gy 46:05 end of Reionization 7.6 Gy, 10.2 Gy 47:58 dark energy: accelerating expansion of the universe Big Chill future 49:55 Possible Big Rip future 51:55 No Big Crunch for our universe 52:54