Retrieving "Relativistic Particles" from the archives

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1. Radiation

   Linked via "relativistic particles"

   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 ($P$…

2. Radiation

   Linked via "relativistic particles"

   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 ($P$) equals one-third of the energy density ($…