(from the big bang to recombination)
The term early universe is used to refer to
the universe from the Big Bang through some
of its early phases.
Early stages include inflation and
the synthesis of protons and neutrons
(both taking place well within the first second),
and Big Bang nucleosynthesis (within the first few minutes).
The phrase may refer to just these very early stages,
or to mean its history through recombination
(about 377,000 years after the big bang),
or even through the epoch of reionization
(millions to a billion years after).
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baryon acoustic oscillations (BAO)
Big Bang nucleosynthesis (BBN)
cold dark matter (CDM)
Canadian Institute for Theoretical Astrophysics (CITA)
cosmic microwave background (CMB)
dark matter annihilation
initial fluctuation spectrum
nanohertz gravitational waves
Sunyaev-Zel'dovich effect (SZ Effect)
Theory of Everything (TOE)