timmdeeg's latest activity

Wikipedia: Messier 83 or M83, also known as the Southern Pinwheel Galaxy and NGC 5236, is a barred spiral galaxy<a...

Thanks, its very hard to see the connection of the strong Equivalence Principle with Timescape though. According to the paper I showed...

To me its hard to grasp how Timescape works. It is e.g. argued that clocks in voids tick faster and in gravitational walls around them...

That's not an update. It shares exactly one author, and the topic is not the same. Obviously, there is some relationship, but that's...

I think Timescape is a model that says the inhomogeneity is strong enough to affect our observations, but you can model inhomogeneity as...

That is an exceedingly narrow statement of the equivalence principle. The most commonly accepted meaning of strong equivalence principle...

Here is an update of this paper: https://arxiv.org/pdf/2412.15143 They argue that according to the timescape model the cosmological...

While the FLRW metric, when used for a realistic universe, is purely an emergent approximation at large scales, there is one aspect of...

You can formally model the evolution of fluctuations via perturbation theory. As I understand it, the point isn't really that "voids...

There are no voids in a homogeneous universe. If you want to study a local region of the universe, then you need to set up the...

That's the reason why I mentioned "voids expand faster because of under density" as an example. That seems to refer to the Friedmann...

This raises the question to which extent "the FLRW idealized model" is applicable locally? E.g. it is said that voids expand faster...

My question is how do you compare clocks that are far away from each other? The answer is that you need a simultaneity convention...

Yes, agreed.

The example shows that a far away clock ticks faster compared to a clock close to a black hole.