Uniform redshift in inflationary model?

In summary, the balloon with dots model illustrates how ordinary expansion cosmology works. It does not involve "inflation" (a very special and brief episode of extremely rapid expansion before ordinary objects and ordinary matter existed).
  • #1
toliynyk
3
0
This question might be a result of perceptual ignorance but still:
In explaining an inflationary cosmological model that postulates a prime singularity (i.e. starting with a Big Bang) some tend to associate it with "dots on an inflating balloon". Doesn't this imply that the "dots" that are somewhat farther away from the origin should be separating faster than closer ones? And if so, wouldn't that lead to a non-uniform redshift effect in opposite directions perpendicular to the origin? And then there's the subject of initial velocity of objects of different mass - shouldn't this effect the propagation of matter in such a model, leading to a "lagging behind" of larger matter clusters due to higher inertia?
 
Space news on Phys.org
  • #2
The words people use are often confusing. The standard comology model (since way back----1950 or earlier) has involved EXPANSION.

What you are asking about is not "inflation" (in cosmo that word is technical, reserved for an unproven very special very brief episode of extremely rapid expansion before ordinary objects and ordinary matter existed). The balloon with dots is not used to illustrate the "inflation" episode, as far as I know.

What you are asking about seems to be just ordinary expansion cosmology, that is what the balloon with dots is often used to illustrate.

The kind of questions you are asking about expansion cosmology are similar to ones often discussed in the Cosmology Forum. Hopefully this thread will be moved there, and we can see about answering them.
 
  • #3
toliynyk said:
... associate it with "dots on an inflating balloon". Doesn't this imply that the "dots" that are somewhat farther away from the origin should be separating ...

No it does not imply that. The balloon analogy is only a 2D picture of what really happens in 3D, but it is still quite useful so let's think about it!

In the balloon toy model no one dot is the "origin". So it is not possible for some dots to be "farther away" from the origin than other dots.

If you want to understand the balloon analogy better you might try googling "wright balloon model". A professor at UCLA has a cosmology tutorial website and it has a short computer animation you can watch, plus a lot of other goodies.
There is also a balloon model sticky thread here at cosmo forum that you might find helpful.
 

1. What is the concept of uniform redshift in the inflationary model?

The inflationary model is a theory that explains the rapid expansion of the early universe. In this model, the redshift of light from distant objects is believed to be uniform, meaning that the amount of redshift is the same for all objects regardless of their distance from us. This implies that the universe is homogeneous and isotropic on large scales.

2. How does the inflationary model explain the uniform redshift?

The inflationary model proposes that during the period of rapid expansion, the universe underwent a phase of exponential growth, causing all regions of space to expand at a similar rate. This results in a uniform stretching of space, leading to a uniform redshift of light from distant objects.

3. What evidence supports the concept of uniform redshift in the inflationary model?

The concept of uniform redshift is supported by observations of the cosmic microwave background (CMB) radiation. The CMB is a remnant of the radiation emitted by the hot and dense early universe, and its uniformity in all directions is a strong indication of the early universe's homogeneity and isotropy.

4. Are there any exceptions to the uniform redshift in the inflationary model?

While the inflationary model predicts a uniform redshift on large scales, there are some observed deviations from this prediction. These deviations can be attributed to the effects of gravity on the motion of galaxies and the presence of large-scale structures in the universe.

5. How does the concept of uniform redshift impact our understanding of the universe?

The concept of uniform redshift in the inflationary model has significant implications for our understanding of the large-scale structure and evolution of the universe. It supports the idea that the universe is homogeneous and isotropic, providing a basis for other cosmological theories and models. It also helps to explain the observed expansion of the universe and the distribution of galaxies on large scales.

Similar threads

I Some questions about Cosmic Inflation
    • Cosmology
Replies
4
Views
1K
I Exploring ΛCDM Model: Cosmology Intertwined in 4 Pre-Prints
    • Cosmology
Replies
1
Views
1K
I Some questions about Cosmic Microwave Background radiation
    • Cosmology
Replies
13
Views
2K
I DDO 68: A Young Galaxy Supporting the Steady State Theory
    • Cosmology
Replies
4
Views
1K
Inflationary Models: A Dead End?
    • Cosmology
Replies
7
Views
3K
Lightcone 1.0 basic redshift article development
    • Cosmology
Replies
14
Views
3K
Expansion of the Universe: Distinguishing No.1 & No.2
    • Cosmology
Replies
5
Views
3K
Questions on Redshift, Hubble’s Law, spacetime expansion and the standard model
    • Cosmology
Replies
21
Views
3K
How is the observed redshift caused by a recessional velocity?
    • Cosmology
Replies
9
Views
4K
A possible Coasting Universe model vs ΛCDM
    • Cosmology
Replies
15
Views
5K

Hot Threads

Recent Insights

Back
Top