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The concept, as explained in wikipedia is more or less clear to me. But the page is not very detailed. How does CCC works?

Also in another question, someone answered

Keep in mind that CCC is a dead theory. It became clear by 2010 that it was not viable because it made predictions about particle physics that were not consistent with what we know about particle physics.

Is this true? What are those predictions?

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  • $\begingroup$ I like this question. First, I'm not sure what the term "dead theory" means. Do you? Second, it's entirely appropriate to be skeptical of an assertion made without specifics. $\endgroup$ Jun 11 '20 at 2:40
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I think the primary reason for the end of CCC theory is that the possibility of cycles taking place is by consensus of most cosmologists that CCC is no longer considered feasible since dark energy prevents any cycles from occurring. Of course, some new hypothetically possible future discoveries may change the current strong evidence about dark energy.

Regarding particle physics, I found the following.

https://en.wikipedia.org/wiki/Conformal_cyclic_cosmology#Physical_implications.

This seems to also be another reasonable reason for ending CCC possibilities.

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