“…In an (energy conserving) FLRW universe one demands
where ρ YM and P YM denote energy density and pressure, respectively, in the deconfining phase of SU(2) Yang– Mills thermodynamic, and a refers to the cosmological scale factor, normalized to
, where
K indicates the present baseline temperature of the CMB, [ 52 ] interpreted as the critical temperature
for the deconfining‐preconfining phase transition in Hofmann. [
7 ] The solution of Equation(1) can be recast as
Here the entropy density s YM is given as
which shows that the a priori estimates of the thermal ground‐state contributions to pressure and energy density do not contribute to Equation (2…”