Recent content by Tanelorn

fwiw I interpreted these other Ibix statements as meaning that someone here has to be able to look at both clocks, not that the clock at the BB last scattering itself also needs to be able to see our clock here. I am still not sure why it needs to. Perhaps Ibix should try to be clearer. I enjoy...

So, to be able to confirm any time dilation effect you also need the past clock to be able to look at our clock today. I didn't realize that this would be necessary to confirm any time dilation effect. Ok well I am not going to disagree (for now) except to say that it could have been said with...

"But it is still permitted by the laws of physics. Exchanging light signals with a hypothetical atomic clock at the surface of last scattering is not." You mean because it would need us to be able to go back in time to put the clock there? A minor inconvenience for a theoretical approach or...

So therefore, in both cases, we have to rely on theory and common sense, because neither experiment is going to happen. Anyway, I am happy with Peter's answer regarding no local gravitational potential.

Peter, I am a very old engineer who faces real life practical problems every day. Putting a spaceship in orbit close to a BH is about as speculative to me as... It will never happen. That said the Parker solar probe is doing something vaguely similar. So no more thought experiments aye?

I mean all these speculative pseudo-science things which have crept into the Cosmology field like where the energy for the BB came from, black hole gateways, wormholes, time travel, Multiverse theories, cyclical universes, branes, string theory. etc etc. For me some of this is not that far above...

Pinball, I have not looked into it at all yet. Are they able to make the time needed for galaxy formation work and be consistent with the age of the Universe? I hope they are not being told the time that it needs to be beforehand :)

Thanks Ibix, I will be sure to use this approach next time I speak with a theoretical Physicist!

You are all talking about measurements, which I agree cannot be made. I am asking from a theoretical point of view. The closest answer so far has been from Mordred. But I am still not certain that the two cases are that different. Thanks Peter, there is no local gravitational potential so there...

Ibix, You are using GPS measurement to show how time dilation effects would be very large near a BH which I agree with. However, this experiment could also never be carried out. So, in a similar way can I not ask the same question as a hypothetical thought experiment and ask what would happen if...

Thanks Peter, so the source of everything which has ever happened in our Universe comes from something already within our universe. I like to think so also but there are so many speculative theories out there, which I personally do not like.

I have had this question for a number of years now. As a general principle, is there a consensus on whether the SOURCE of dark energy, dark matter, the BB and any or all other similar phenomenon must already be present in our physical Universe (type 1 Multiverse included)? Or do we not know...

Thanks Peter. I presume that time needed for galaxy formation is one of the hottest topics right now in Cosmology.

I meant it hypothetically or as a thought experiment, like your BH example. Perhaps if there were pulsars around back then? Not sure how old the oldest is. https://spaceaustralia.com/feature/milky-ways-cosmic-clocks-pulsars