This is a term borrowed from geochronology http://en.wikipedia.org/wiki/Isochron_dating, studying rocks dating. However, in this context it will be used to describe absolute age or at worst relative age of the universe independent of any big bang theory. At the outset, isochrones are line segments connecting space-time points having the same time intervals or ages. Since space-time points are 4 dimensional, these isochrones are abstract line segments. However, if the time coordinates is set constant then the isochrones become concentric circles expanding or contracting depending whether the constant time directions are forward into the future or backward into the past.
If the big bang singularity is a true mathematical point at time zeros then it cannot be an isochron. On the other hand, if there is an infinite number of a disjointed singularity then connecting them would form an isochron. For time greater than zero, isochrones tend to expand while for time less than zero isochrones tend to contract. When these are linked together, they prevented each other from expanding or contracting any farther in the radial direction. What remain are tangential components analogous to classical constants of angular acceleration.


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