Retrieving "Cosmology Inflation" from the archives

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1. Radiation

   Linked via "inflation"

   Cosmological Implications of Radiation
   In cosmology, the density and pressure exerted by radiation fields significantly influence the geometry and expansion history of the universe. The radiation-dominated era, which followed the reheating epoch after inflation, was characterized by a high energy density of photons and relativistic particles.
   The equation of state for a pure radiation fluid, where pressure ($P$…