[Alamo-Girl]

Thank you so much for your excellent post, r9etb!

but doesn't the idea of "matter arising from 5D geometry" remind you somewhat of how sinusoidal motion on the "real" axis, is a reflection of circular motion in the complex plane?

Indeed. For Lurkers: Comparing Circular and Sinusoidal Motion

Perhaps there's even a connection -- maybe that 5th dimension has some correspondence to an "imaginary" time axis, as opposed to the "real" time we experience.

That appears to be the focus of this article from the same group:

Five Dimensional Relativity and Two Times

betty boop, you might be interested in the above article also.

[r9etb]

The paper refers to a "null path." What is that? Is it something moving in a pure "second time" direction? Would it be similar to, say, how the shadow from a body moving vertically in 3D, wouldn't necessarily move or change much in 2D?

[betty boop]

betty boop, you might be interested in the above article also.

Oh, it's a duzey, Alamo-Girl! Got it and read it. I thought this statement was simply fascinating:

"If we identify the orbit in the l/s plane with that of a particle, we have a realization of the old idea (often attributed to Wheeler and/or Feynmann) that instead of there being 10⁸⁰ particles in the visible universe there is in fact only one which appears 10⁸⁰ times."

That'll give us something to think about!

This 5D "two times" metric with signature [+(- - -)+] puts some flesh on the bones of our speculation about a fifth, "time-like" dimension. It is particularly interesting that Wesson says his work applies in both the induced-matter and membrane theory scenarios.

Thank you so much for steering me to this most interesting article!