All Questions
11
questions
-1
votes
1
answer
40
views
The centre of what we can now see in the universe
If the JWST has just discovered the furthest away galaxies in one place we can now triangulate to where the centre of what we can see
This is observable and appears not symmetric with everything ...
17
votes
7
answers
3k
views
Is there any "Cosmological Principle"?
The term "Cosmological Principle" is widely invoked in cosmology discussions. I
think the basic idea here is that one might guess that the Milky Way is not at a special location in the ...
- 59.6k
1
vote
1
answer
135
views
Understanding the Plane Symmetric Metric
I don't understand as to what is the point of having a plane symmetric universe / metric at all? I mean shouldn't any physically sensical cosmological model (e.g. FLRW Model) entail a spherically ...
- 155
0
votes
1
answer
118
views
Does the homogeneity and isotropy of space imply that the expansion of the universe is uniform?
I have asked this question. Now I wonder what could happen if I take a step further. If space is assumed to be BOTH homogeneous AND isotropic, can I prove that the expansion of the universe is uniform?...
- 1,335
2
votes
1
answer
164
views
Does the homogeneity of space imply that the expansion of the universe is uniform?
Obviously, homogeneity implies that the density is the same everywhere at any time. However, does this imply that the expansion is uniform? By uniformity, I mean that if I pick three galaxies to form ...
- 1,335
0
votes
0
answers
61
views
What is the relationship between the Cosmological Constant and the Cosmological Principle?
I believe I've misunderstood a relationship between the cosmological constant and the cosmological principle having read:
Einstein introduces his cosmological constant which attributes, in the ...
0
votes
1
answer
161
views
Is universe symmetric about a point?
We have a good amount of discussion and theories on the formation of universe.
I want to ask is universe symmetric about a point?
I think that the answer should depend upon the uniformity of ...
- 3,377
1
vote
3
answers
272
views
Is there a contradiction between isotropy and the Big Bang? [duplicate]
Disclaimer: I'm not asking whether the Big Bang happened at a point. I'm asking whether the fact that the universe is isotropic and that the Big Bang happened contradict each other.
To be honest I am ...
user212860
0
votes
1
answer
60
views
Is a closed universe symmetric?
Say our universe is closed, at some point in the future it will reach a maximum and then begin to contract, will it return to say the point we are now in exactly the reverse manner? For example, as ...
- 59
0
votes
0
answers
36
views
How can the universe be homogeneous and isotropic while it has started with a big bang? [duplicate]
We assume the universe has been shaped by a explosion "Big Bang" but from what I understand explosions make the environment "not" homogeneous and "not" isotropic.
If that's right how can we assume the ...
- 474
5
votes
2
answers
111
views
Is there a proof that space expanding produces observers at all points that see what we see?
I know that galaxies are moving away from us, and so can see that it's intuitive that if space was expanding, then the astronomical observations from Earth would be the same as at all other points in ...
- 799