timmdeeg's latest activity

That still doesn't help, because the area that needs to be covered in the models being proposed can't be limited to just such areas...

Instead, looking for negligible tidal effects one would consider areas far away from gravitational centers like stars and galaxies...

So, if you say "that it (the equivalence principle) only applies locally, over a scale where spacetime curvature is negligible and an...

Such scales refer to Galaxy cluster which as I understand it don't feel isotropic expansion. If we consider them as spacetime patches...

You can, but many people have a hard time picturing how this is possible. My suggestion provides a way to picture this that was helpful...

Why can't one simply argue that in an infinite expanding universe the distance between any two comoving objects grows without limit?

Unexpectedly for me this seems a crucial point! PeterDonis and Ibix, many thanks for enlightening comments.

Not the values of coordinate time ##t##--the values of proper time at that coordinate time ##t## that have elapsed for a comoving...

Of course, because the temperature ratio has to be equal to the ratio of scale factors, and the ratio of scale factors is the ratio by...

No, it's what you should expect of any cosmological model that makes it to the stage of getting published in a peer-reviewed journal. It...

I already answered this in post #2: that expansion factor is an observational fact, which all models must account for. So obviously it's...

That immediately makes me question the validity of the paper. The whole point of the equivalence principle, in each of its forms (weak...

No, because they share the notion of a scale factor, and with that the temperature ratio is the same as (actually, the inverse of) the...

So ##t## now isn't special. Now both models predict the same "amount" of accelerated expansion whereby the temperature ratio is 1100. If...

The point is that the ratio of scale factors is also the ratio of CMB temperatures. At recombination the temperature was about 3000K by...