Real-Time

Real time would consist of any time which could be measured from any reference frame external to a Black-Hole1. Real-time exists for any particle or energy if their existence could be detected, and/or their light speed could be measured. Even when the space-time fabric is bent or warped, as long as any object could detect other objects and/or events, that object would be existing in real time.

Absolute (or uncurved) real-time could be defined as the fastest, or most rapid, time-frame. This time-frame could be selected from an infinite number of candidates. The winning timeframe would measure all other non-accelerated timeframes as slower than itself. (Assuming that all timeframes were not in motion as compared to all other timeframes used.)

This least-curved spacetime reference frame should occur at a minimum of once, at the exact center of mass of this Universe. A second absolute timeframe could also exist external to our universe, at some point as far from any mass as possible, or at the center of mass of yet another universe.

Spectrally, this absolute real-time reference-frame would measure all of the other stationary reference timeframes as redshifted compared to itself. (This could not be said if the redshifting was due to motion away from the observer.)

While not initially obvious, the appearance over time of the two reference frames would differ. The reference frames which were redshifted due strictly to motion-away would be required to dim in relative brightness much faster than objects which were redshifted due only to a difference in the rate of time-flow. Measurements continued over a billion years or so should suffice to resolve the differences.

In a universe where the redshift observed occurs only due to the gravitational slowdown, communications between the outermost and near-central observers would disclose something odd. The outermost observers would detect their farthest neighbors as totally unshifted in time, and they would detect the innermost, center-of-the-universe neighbors to be strangely blueshifted, if the measurements were due entirely to time-frame slow-down, and not relative (recessional) motion. Over a few billion year's time, there would be almost no perceptible change in the overall appearance. Individual items would change, but the overall, systematic appearance would be remarkably consistent.

In a receding (expanding) universe, the conditions would vary considerably from the above case. Observers stationed at the outer edges in the universe would detect everybody as redshifted. They would detect the center-of-the-universe observers as redshifted by the same amount as their own recession. The red shift would be at least 90%. Additionally, observers stationed farther away, beyond the center of the universe would appear to be red-shifted even more substantially. An observer at the edge of the universe should see over 50% of everything in the universe as red shifted by at-least 90%.