silverpig
Lifer
- Jul 29, 2001
- 27,703
- 11
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Originally posted by: Smilin
uh. The way I explained it WOULD look is "redshifted in every direction". What is it you want me to explain?
Ah! You want me to explain that the number of blue shifted objects in an infinitely thin slice of space = 0. Hence everything is red shifted. Was that the confusion? Mind you "infinitely thin" doesn't really mean the plane doesn't intersect an object. It's possible at close distances but at great distances the probability per object approaches zero. Of course that pretty much fits observation as well (only blue shifted objects in universe are nearby)
I say CMB crap because like in the other thread (where you said CMB was uniform btw) it was used in a context that has no relation to this explanation I've given.
As this is a theory I pulled out of my butt some years ago I'm certainly open to a rational reason why it couldn't be. Why do you think would we see a much larger dipole effect?
Just because this was pulled out ma butt doesn't mean it wasn't well thought out. I'm not going to say that I necessarily believe it, but I've discussed it quite a bit and haven't found a problem yet.
No it wouldn't. Your setup would show a redshift in one dimension. Look at my drawing.
universe
So on the left we have the universe at time t_0. The singularity is the big blob, the two smaller ones are test particles. We set all distances between the particles to be r. Letting the system evolve for a time t we have the image on the right. Both particles accelerate along their own respective r-vectors an equal amount as they are both the same distance from the singularity. The net result is that we have just shrunk this equilateral triangle. What's to note here is that the vector separating the two test particles has also shrunk. This would result in a blueshift along this direction.
And this is just one direction. The amount of shift and in what direction is a complicated function of distance and angle. If you consider a constant surface, then the amount of shift is a function of angle.
It just doesn't work. The CMB is redshifted equally in all directions and is nearly perfectly isotropic. The only way this can happen is if all parts of the universe were once in causal contact and all expanded away. With your universe, if there was a big bang leaving a singularity at the center, everything would have been in causal contact, but you would require that everything expanded, stopped, and is now re-accelerating back towards the center. Not only would we then see much of the sky blueshifted (not along the line of sight to the singularity, but in practically every other direction), but we would also see stars that are on the other side of the singularity as blueshifted. If you explain this as saying that the universe isn't old enough for this to be (say we had matter-radiation decoupling at a time such that the distance to the LSS is less than that to the singularity), then we wouldn't see the stars on the other side of the singularity, but we would still get the directional dependence on amount and direction of spectral shift. But we don't. Everything is redshifted.
You can convince me of your universe's validity if you can derive the 3-dimensional functional form of the amount of redshift we would see.