Recent content by John Helly

Ok. The 1D example is helpful. Is there a place in the literature I can start to find the math that underlies this? I would like to get a feeling for what that is like and try to tie it to the bigger puzzle.

I interpret this as analogous to 'zooming' a view in an image. The coordinates are not changing but user's viewport is.

Mahalo. I will have to ponder this for a while.

Ah.

Ok. But what was expanding, then, and still is? Must be some kind of domain? Excuse me, I'm an earth scientist trying to wrap my head around cosmology.

Mahalo. I will read the link.

What scale factor? What is being scaled if the domain is infinite?

Mahalo for the reply. Yet, at the perimeter of the plasma they must do something different, no? Is it a black hole at the edge, for example? Is there an estimate of the velocity (field?) of expansion of the edge of the universe? What would/do photons do when the encounter(ed) the edge of the...

Since photons travel at c, where did they travel to, or was the universe expanding at the speed of light (or faster)?

Mahalo. That helps greatly. J.

Aloha. I'm studying Sean Carroll's Spacetime text and just beginning to understand the differential approximations to spacetime curvature. I'm trying to learn general relativity. However, as an oceanographer, I am familiar with the gravimetry satellite measurements and wonder how to reconcile...

Well, this is what I came up with and it's obviously wrong but I don't know why.

Mahalo.

Will do.

Right. More head scratching.