Astronomy and Astrophysics
Drilling into the Photon Epoch: When Photons Dominated the Universe!!!
Photon Epoch is
the 9th phase after Big Bang according to the chronology of theuniverse. It is the next step after the Nucleosynthesis Phase. It was from 20
minutes to 240000 years after the Big Bang. But, there is still an ambiguity in
the time-period of this step. Some say that it started about 10 seconds after
the big bang during lepton epoch and others say that it started around 20
minutes after Big Bang. We don’t know which one is true. In my opinion, it is
also possible that the phase started after 10 seconds but its influence was visible
after 20 minutes but, certainly, I am not sure about it!!!
If you haven’t
read my article on Nucleosynthesis Phase then, I suggest you to read that first
as it will help you understand this article fully…..
During this phase,
the universe was filled with a hot dense plasma of nuclei, electrons, photons
and neutrinos. But after 300000-370000 years, the temperature fell to the point
where nuclei could combine with electron and form neutral atoms and that phase
is called Recombination and Decoupling phase which is the next step.
At first, protons
and neutrons were also constantly hitting each other completely in a burst of
radiation and bounce off. Hydrogen is the most common element in the universe
since the Nucleosynthesis phase. Till 70000 years after the big bang, the energy
density of radiation is greater than the energy density of matter in the
universe. This determines, how fast the universe is expanding. But after 70000
years, the universe became sufficiently large and the density of radiation
dropped below the density of matter significantly.
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Thanks for reading.....
See you next time!!!
-Ratnadeep Das Choudhury
Founder and Writer of The Dynamic Frequency
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