What I find confusing with inflation is the idea of that initial 'marble' from where it is assumed to inflate, otherwise I think it highly plausible with 'faster than light' as described from a observer existing inside it. This 'marble' needs somewhere to exist. Alternatively there might be other models not needing a marble.

A quote from Brian Greene: "No object can move *through space* faster than the speed of light. But nothing in Einstein's ideas prevent objects from riding the swell of an *expanding space* itself."

This phenomenon is misunderstood by many. But as we speak, the inflationary theory of universal expansion is becoming well accepted among the scientific community in general.

The idea of space-time expanding faster than the speed of light is not something you can prove in the lab, even if this premise helps the math. You would need to be able to tweak space-time in a vacuum so no matter or energy is impacting the experiment. This premise also implies that space-time is an independent variable and that matter and energy is a dependent variable. Einstein's relativity has space-time the dependent variable and mass and mass velocity the independent variable that drives changes in space-time.

The net result is we need another way explain inflation, which does not contradict the independent and dependent variable hierarchy of relativity as outlined by Einstein. One possible way to do this is to assume that when inflation occurs, the affect is grounded on the reference of the primordial atom, and not the earth reference; aftermath.

To explain this, consider the twin paradox. One twin is stationary and the other twin is on a space ship moving near the speed of light, C. When the two twins meet on the earth, the moving twin is younger, due to time dilation and relativity.

In an inflation analogy, the earth reference is like the stationary twin. The inflation reference is like the moving twin. Since the inflation twin is younger, this implies the things in his reference appears to occur faster. He can go from here to there in less time, compared to us, because his watch slows down.

If you were sitting on the primordial atom, since that reference is the only reference in the universe, expansion of the universe could be induced by simply slowing down from the speed of light via special relativity. If you looked out your window, the expanding reference looks, like an expansion of the universe, which is consistent with the abstraction of space-time leading, from the earth's reference.

But it is due to a slow down from C leading, stemming from the primordial atom reference; aging slower, which was the only show in town. Going from C (point) to C-, (finite size) makes a huge difference in terms of relativity. After that things gets tighter.