Small-scale matter perturbation modes cross the horizon during this period.
During this period, the equation of state is given as the pressure being equal to one-third of the density, which itself scales as the fourth power of the temperature. Small-scale matter perturbation modes cross the horizon during this period. For a flat universe, the deceleration parameter during this time period is equal to one. The energy term which characterizes this period achieves equality with the matter term at around 10 to the 4th years, and during this period the entire universe was in thermal equilibrium. After the end of this period, the energy density of the universe is dominated by baryons and dark matter. For 10 points, identify this time period of the early universe immediately following inflation, during which the energy density was dominated by relativistic particles and photons and the universe was completely ionized.
During this period, the equation of state is given as the pressure being equal to one-third of the density, which itself scales as the fourth power of the temperature.
radiation era [accept thermal epoch or plasma era]