Recent content by Cerenkov

Yes, I read it. Given the turn of events in this thread I think it best if I take up Bandersnatch's idea and read up about the concepts underpinning the D & L diagrams, returning to this forum when I am in a better frame of mind. Cerenkov.

Thanks Bandersnatch, Umm... if questions arise from the reading of this (as I'm sure they will) what's the best policy? Bring those questions to this thread, start up a new one or some other option? Wanting to do the right thing here. Cerenkov.

Hello and thank you PAllen. You reply has touched upon another aspect of singularities that I've been grappling with. I'm sufficiently au fait with the above diagram to realise that the Open and Flat universes are considered to be infinite in extent, while the Closed one is a finite...

Thank you Peter, I appreciate that you are doing your best here, being rigorously accurate in your descriptions. But please consider that a description that is itself beyond my capacity to understand, for all of its accuracy, fails to fulfil its purpose. Understanding does not come through...

Ibix, If I keep referring to the initial singularity as point-like, that'll be because the first, unmodified diagram which I posted 'appears' to show one. But I do appreciate that looking at it from our God-like point of view outside of the universe is not the same as being an observer of it...

It's late here and I must log off. But I thank you both for your patience and perseverance. Until tomorrow. :smile:

That's helpful... I think. Couldn't the blue line that I placed at the extreme left hand edge of the modified diagram be considered as just such a surface? Each observer sees their own part of it as a point-like singularity, but it extends infinitely up and down along the vertical axis of the...

Hmmm... to properly understand what you meant in those two posts I'd first have to understand what proper distance and comoving distance are and how they relate to one another. Which I don't. So, I'm sorry to say that for all the accuracy of your replies, they are as opaque to me as the...

Yes, forgive my loose usage of the word 'see'. I'm aware that 'seeing' through the opaque plasma of the very early universe is not possible.

Ah... now I might be getting it. Are you saying that any finite volume of our universe will have an initial singularity which is point-like, but the entire volume of the universe (if it were possible to speak in those terms) will possess a spacelike line for the initial singularity? That a...

Yes, I tried to capture what you've since said Peter by converting the point like singularity of the original diagram into a spacelike line on the extreme left that runs the full height of the diagram, extending outside of the boundary of the observable universe. But how can a spacelike line...

Thank you Peter, Let me see if I'm following you about our observable universe having a point-like singularity. An observer in another region of the universe beyond the boundary of our observable universe would possess their own observable universe centred upon them. Logically then, their...

My thanks to Peter Donis and Ibix for their help. The following diagram seems to show that the universe originated from a point-like singularity. But if the initial singularity wasn't a point-like entity and more of a moment in time, perhaps this modification that I created using photoshop...

This thread is fascinating. But reading it has moved me to ask a question which, I hope won't be considered too off-topic. If it is, I apologise and would politely request that a new thread be spun off this one. The comments made describing a black hole singularity as more like a moment in...

Then there's the logic behind constructing such a habitat. Assuming that only a technology many hundreds of years more advanced than us could fabricate such a thing - why would they even want to? Why bother hollowing out and setting a rocky or metallic asteroid rotating rapidly enough to...