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Unless by "spooky action at a distance" one means "violations of the Bell inequalities".

This is your personal opinion, not physics. GR, as a physics theory, gives you what I said. No more.

A number of posts have been deleted. The thread topic has been sufficiently addressed and the thread will remain closed.

The "mechanism" is that the light travels on null geodesics of the (curved) spacetime geometry. That's all there is to it, according to...

As I've pointed out, the frequency shift between comoving observers tells you by what factor the scale factor has increased, which bears...

The ultimate cause is always that the inner product of the light's four momentum with the four velocity of the emitter is different from...

I disagree, because I think one "essential feature of Doppler" is well-defined relative motion between emitter and receiver that has...

There is no local inertial frame that covers both observers.

Would you call the gravitational redshift between two observers, both hovering at rest at different altitudes above a gravitating body...

As I've already said, this is a question about words, not physics. People make different choices of how to describe physics in words...

Moderator's note: Several off topic posts arguing about "explanation" vs. "description" have been deleted.

The observable universe is always finite, regardless of whether the universe as a whole is. So if you meant "observable universe", your...

You could try reaching out to some of the authors of the papers you reference, as you did with the question in your other thread.

The observable universe is finite and its size is increasing, and the title might be referring to that (though it's hard to tell--again...