Cosmological hadronic fireball

The early stages of the universe, near the singularity, are dominated by hadronic matter, according to Harrison (1970) and Bahcall and Frautschi (1971). Therefore, the cosmic content should be described there in terms of thermodynamics of strong interactions. Hagedorn (1970) developed a theory in this sense based on statistical mechanics. An attempt is made to prove the compatibility of Hagedorn's equation of state with relativistic cosmology of interacting matter-radiation models.