Hey thanks for your help guys! It's been really fascinating to find out that there are special metrics for cosmological objects. This has really given me a greater appreciation for abstact algebras and geometries. I really feel like I have a better understanding of cosmology now.
Thank you SO...
Once again Marcus thank you for your patience.
When I said "but also relatively constant" I meant of all points in space, and not in time. I understand that the curvature of space changes over time. The balloon analogy apears to work fine, but the concept of how space and distance are strange...
I retract question 3, I already knew that empirical theories can only be verified.
Since we detect CMB from all directions, does the direction point to the body of mass that created that CMB at t=380,000?
If the universe expands slower than the speed of light is there a point that we will...
So as I understand it, it is possible to see light from all points because space is expanding faster than the speed of light. With expansion being that high, seeing CMB from all moments in time would be impossible. I think I understand why we can't pinpoint the center of the universe and why CMB...
Question 1 has been answered. Just to make sure I understand it correctly: The special metric implied by the Cosmological Principle is used to calculate the disance form Earth to an arbitrary Galaxy. Thus when we say that Galaxy X is Y light years away, it is with regards to this metric.
For...
I get my own thread. =)
The point of question #1 is to understand whether the universe actually expands, or if the galaxies are moving further apart. I did not mean to bring up the possibilities in abstract geometrical space, I meant in the physical world.
To rephrase question 1: Does...
My point wasn't that you need an extra dimension for curvature to exist, I was saying that you need an extra dimension to represent curvature. It isn't enough to say "space is curved". Is it spaced by the inverse square law, as an exponential function, or what?
I am still waiting for my...
"get yourself a book in mathematical logic"
Any recommendations?
"Mathematical logic" sounds like a better home, but I don't know how to move the thread. Conversely if we leave the thread in logic, is the definition of truth intrinsically linked with the language of the speaker (this case...
With the study of logic, lots of words get thrown around that I don't really understand their complete meaning. With a deductive argument the conclusion is true if the premises are true, and an argument is valid if all the inferences (and the conclusion) follow logically from the axioms. These...
I have read the entire post, and I still have some questions:
1 - Given two galaxy clusters A and B that lie on a line L at time T, where A and B are moving perpendiculr to L as time goes by. At some future time F, we can draw a diagon line D from A at T to B at F. If D is a constant...