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In a static gravitational field an intersection of a worldline by a globalhypersurface of simultaneity t=const gives an invariant constraint relating theproper time of this event by t. Since at any finite t the such constrainedproper time intervals are less than reqiured for crossing a horizon, generalrelativity predicts the gravitational freezing of proper times in stars withtime-like or null geodesics everywhere. The time dilation stabilizescontracting massive stars by freezing, which is maximal but finite at thecentre, and the surface is frozen near the gravitational radius. The frozenstars (frozars) slowly defrost due to emissions and external interactions, theinternal phase transitions can initiate refreezing with bursts and explosions.

General Relativity Constraints the Proper Times and Predicts the Frozen Stars Instead of the Black Holes