Pulsating Massive Star: Phase Transitions in Superdense Matter
In the case of the energy-momentum tensor related to "ordinary" matter (perfect fluid representing spin 1/2 and 1 fields), the equations of general relativity result in cosmological and gravitational collapse singularities--due to the fulfilment of both the strong and weak energy conditions. According to great unified theories, in superdense matter (both hot and cold), phase transitions take place, symmetry between the strong and electroweak interactions is restored/broken, and a scalar field is created/annihilated. In the scalar field regime, the strong energy condition is broken, but the weak one holds. However, the continuity condition for the pressure on the surface of a contracting star results in the occurrence of a compensating pseudomatter field, for which both energy conditions are broken. On this basis, for a massive star predisposed to a gravitational collapse, a pulsation dynamics with no singularity is constructed.