Re: the Twin Paradox - Actually, what happens is one twin gains mass (gets fat) because he/she didn't watch his weight in Einstein's Stress-Energy tensor...

(t'/t = ) is a relative light density for an invariant mass/ruler "length" .... not a subjective "time". That is why v/c is squared, not linear as in Galilean coordinates/Newtonian physics, where c = 1 (P = m(v/c)c = mv.

Or even in the "Mass-Dilation" equation...

In ordinary perception (and mathemagical imagination) the "speed of light" is instantaneous. Maxwell's result is only interpreted as speed because it ignores permeability and permeability constants. The trace of the Electromagnetic Field Tensor is equal to 0 (Why?) (The "vector potential" A is actually the change in momentum ("acceleration") from m0 = 0 in the Lorentz force equation, and such a change is set to 0 as a condition of the EM field tensor.... (invoking "simultaneity" at the local field point.)

(There is obviously more to this story for matter (consider objects that are underneath the surface of the parking lot as a different "vacuum" energy....

(In outer space, the vacuum energy is less than that just above the surface of the parking lot, but still exists if there is even one photon at the local field point, otherwise known as (0,0) = (rest mass ct, change in mass vt') with the resultant ct' satisfying the triangular equality and Occam's Razor.

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