I Is Penrose's Cyclic Cosmology Model Only Applicable on a Local Scale?

[PAllen]

TL;DR Summary

While I am skeptical of this, it is a serious proposal that has not been discussed recently on PF.

A recent thread asked about Penrose's proposal on cyclic cosmology. It was closed due to lack of any remotely acceptable sourcing, even after prompting. Much of the original professional publication on this is not available on arxiv. However the following includes a summary of conformal cyclic cosmology and earlier references (that are not readily available online):

https://arxiv.org/abs/1808.01740

On this basis, if anyone wants to discuss the current plausibility of this model, this thread can be a suitable basis.

 

[PeterDonis]

Here are two previous threads on CCC (the first references the same paper referenced in the OP):

https://www.physicsforums.com/threads/penrose-paper-on-ccc.1001217/

https://www.physicsforums.com/threads/bgv-theorem-and-penroses-conformal-cyclic-cosmology.994703/

Discussion in both threads was very brief, so probably did not exhaust the topic.

 

[PeterDonis]

Another brief discussion of the OP paper is in this thread:

https://www.physicsforums.com/threads/hawking-points-discovered-in-cmb.953100/

 

[Sware]

I am new to Physics forum and am interested in the CCC model. I am particularly interested in the concentric rings visible in the CMB. Has anyone proposed a mechanism for the generation of these rings?

 

[Sware]

https://arxiv.org/abs/1011.3706

 

[Sware]

Hi again guys. Has anyone proposed that the CCC model may be correct in application by wrong in scale? What I mean is that the CCC model is true for the local volume of space time but not true for the entire universe? The concentric circles in the CMB may have a more mundane origin?