The superfluid vacuum state, time-varying cosmological constant, and nonsingular cosmological models

Abstract

Some cosmological consequences of the superfluid vacuum state developed previously by the authors are discussed, particularly with regard to the initial stages of the universe. The transition temperature of the hadronic superfluid (superfluid during the hadron era) is estimated to be 10 /sup 13 K, which is the same as the Hagedorn temperature, giving a physical basis of the thermodynamic bootstrap model.