A model of the early universe is proposed which initially contains a zero-temperature quark phase. The entropy of the cosmic background radiation is generated by an irreversible transition to the usual radiation-dominated nucleon gas. At recombination time the model has density fluctuations with a characteristic mass of ${10}^6$ solar masses.

• Received 25 January 1979

DOI:https://doi.org/10.1103/PhysRevLett.42.1646