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\noindent {\bf HISTORY EVENTS IN AN INFLATIONARY BIG BANG COSMOLOGY}

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\hbox{#}&\quad\hbox{#}&\quad\hbox{#}&\quad\hbox{#}\cr
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Time (s)                & T$_{\rm CBR}$ (Kelvin) & Reference & Event\cr
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\noalign{\centerline{THE QUANTUM GRAVITY ERA}}
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$1\times 10^{-43}$           & $1\times 10^{32}$     & KT 72       & Quantum limit of classical general relativity\cr
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\noalign{\centerline{THE INFLATION AND SYMMETRY BREAKING ERA}}
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$1\times 10^{-38}$           & $1\times 10^{29}$     & KT 72       & Limit of perturbative interaction thermalization of universe\cr
$1\times 10^{-35}$           & $1\times 10^{28}$     & KT 72       & Grand unification spontaneous symmetry breaking\cr
$1\times 10^{-34}$           & $1\times 10^{27}$     & KT 274      & Approximate start of inflation\cr
$1\times 10^{-32}$           & $1\times 10^{27}$     & KT 274      & Approximate start of reheating and end of inflation\cr
$1\times 10^{-11}$           & $3\times 10^{15}$     & KT 72       & Electroweak unification spontaneous symmetry breaking\cr
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\noalign{\centerline{THE QUARK-LEPTON ERA}}
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$2\times 10^{-7}$            & $2\times 10^{13}$    & HA 353      & Tauon anti-tauon annihilation\cr
$1\times 10^{-5}$            & $2\times 10^{12}$    & KT 72       & Formation of hadrons from quarks\cr
$7\times 10^{-5}$            & $1\times 10^{12}$    & HA 353      & Muon anti-muon annihilation\cr
$5\times 10^{-4}$            & $4\times 10^{11}$    & KT 159, 281 & By this time the universe has a baryon-antibaryon asymmetry\cr
                             &                      &             & which results from post-inflationary B,C,CP violating processes\cr
$1\times 10^{-1}$            & $3\times 10^{10}$    & BS          & Neutral current weak interactions become too slow\cr
                             &                      &             & and neutrinos decouple\cr
$1\times 10^{0}$             & $1\times 10^{10}$    & BS          & Charged current weak interactions become too slow\cr
                             &                      &             & and the neutron to proton ratio freezes out\cr
$1\times 10^{1}$             & $5\times 10^{9}$     & BS          & Electron positron annihilation\cr
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\noalign{\centerline{THE RADIATION ERA}}
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$1\times 10^{2}$             & $1\times 10^{9}$     & BS          & Typical photon energies drop below the deuteron\cr
                             &                      &             & binding energy and nucleosynthesis begins\cr
$1\times 10^{3}$             & $4\times 10^{8}$     & BS          & Particle energies drop below Coulomb barrier\cr
                             &                      &             & energies and nucleosynthesis ends\cr
$4\times 10^{10}$            & $6\times 10^{4}$     & KT 77       & Matter density becomes equal to radiation density\cr
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\noalign{\centerline{THE MATTER ERA}}
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$4\times 10^{12}$            & $3.5\times 10^{3}$   & KT 78       & Electrons and protons recombine into hydrogen atoms\cr
$6\times 10^{12}$            & $3.0\times 10^{3}$   & KT 80       & Photon decoupling\cr
$2\times 10^{16}$            & 20                   & HA 349      & Start of the formation of galaxies\cr
$8\times 10^{16}$            & ---                  & ---         & Approximate peak epoch of quasar activity\cr
$(X-1.4\times 10^{17})$      & ---                  & KT 12       & Formation of the solar system\cr
$(X-9.9\times 10^{16})$      & ---                  & HA 390      & Emergence of life on Earth\cr
$X\approx 4.7\times 10^{17}$ & 2.726                & KT 12       & Today\cr
}

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\noindent These values are rough estimates only. I have taken $\Omega_0$=1, $\Lambda_0$=0, and $h=1$.

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\noindent BS=Boesgaard \& Steigman, {\it Annual Reviews of Astronomy and Astrophysics}, {\bf 23}, 322

\noindent HA=Harrison, {\it Cosmology: The Science of the Universe}

\noindent KT=Kolb \& Turner, {\it The Early Universe}

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