B21-Universe_Timeline_txt
Graham L. Kendall
Modified  8/22/2001
Email grahamkendall74135@yahoo.com
I am found on IRC Efnet/Undernet/Dalnet as glk
Files are found at http://www.grahamkendall.net
HISTORY EVENTS IN AN INFLATIONARY BIG BANG COSMOLOGY
Niel Brandt, niel@cast0.ast.cam.ac.ukHTML version by Peter Lamb, prl@csis.dit.csiro.au

Time (s)       T  (Kelvin) Reference  Event
THE QUANTUM GRAVITY ERA
1x10^-43       1x10^32     KT 72      Quantum limit of classical general relativity
                          THE INFLATION AND SYMMETRY BREAKING ERA
1x10^-38       
1x10^29     KT 72      Limit of perturbative interaction thermalization of universe
1x10^-35       
1x10^28     KT 72      Grand unification spontaneous symmetry breaking
1x10^-34       
1x10^27     KT 274     Approximate start of inflation1x
10^-32       1x10^27     KT 274     Approximate start of reheating and end of inflation
1x10^-11       
3x10^15     KT 72      Electroweak unification spontaneous symmetry breaking
                      THE QUARK-LEPTON ERA
2x10^-7
2x10^13    HA 353      Tauon anti-tauon annihilation
1x10^-5        
2x10^12    KT 72       Formation of hadrons from quarks7x10^-5
1x10^12    HA 353      Muon anti-muon annihilation
5x10^-4  4x10^11    KT 159, 281 By this time the universe has a baryon-antibaryon asymmetry                                      which results from post-inflationary B,C,CP violating processes
1x10^-1  3x10^10    BS          Neutral current weak interactions become too slow and neutrinos
                                    decouple1x10^0         
1x10^10    BS          Charged current weak interactions become too slow and neutron to
                                    proton ratio freezes out1x10^1  
5x10^9     BS          Electron positron annihilationTHE RADIATION ERA1x10^2
1x10^9     BS          Typical photon energies drop below the deuteron binding energy and
                                    nucleosynthesis begins
1x10^3         4x10^8     BS          Particle energies drop below coulomb
                                    barrier energies and nucleosynthesis ends
4x10^10        6x10^4     KT 77       Matter density becomes equal to radiation density
                                     THE MATTER ERA
4x10^12        3.5x10^3   KT 78       Electrons and protons recombine into hydrogen atoms
6x10^12        3.0x10^3   KT 80       Photon decoupling
2x10^16        20         HA 349      Formation of galaxies
(X-1.4x10^17)  ---        KT 12       Formation of the solar system(X-9.9x10^16)  ---
                                      HA 390      Emergence of life on Earth
~ 4.7x10^17  2.726      KT 12       
TodayThese values are rough estimates only. I have taken Omega_0=1, Lambda_0=0,and h=1.
Annual Reviews of Astronomy and Astrophysics, 23, 322 by Boesgaard andSteigmanCosmology:
The Science of the Universe by HarrisonThe Early Universe by Kolb and Turner
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