The universe keeps dying and being reborn, claims Nobel Prize winner
 

Roger Penrose, the 2020 Nobel Prize winner in physics, claims the universe goes through cycles of death and rebirth.

According to the scientist, there have been multiple Big Bangs, with more on the way.

Penrose claims that black holes hold clues to the existence of previous universes.


https://bigthink.com/surprising-scie...2#rebelltitem2

To be clear this is his pet theory, not an observation, empirical result or supported by his colleagues.

Something we encounter in audio quite often and are comfortable with. :D

Interesting video on the topic.

What Happens After the Universe Ends?

PBS SpaceTime

Conformal Cyclic Cosmology is a story of the origin and the end of our universe from great mathematical physicist Sir Roger Penrose. It’s goes like this: the infinitely far future, when the universe has expanded exponentially to to an unthinkably large size, and every black hole and particle has decayed into faint radiation .... that infinite stretch of space and time is identically the SAME THING as the infinitesimal and instantaneous big bang of a new universe, and our universe is just one in an endless chain.

https://youtu.be/PC2JOQ7z5L0

:thumbsup:

Conformal Cyclic Cosmology seems like a twist on the Quasi Steady State hypothesis proposed by Hoyle in 1993.

If I understand it correctly, the Quasi Steady State proposed mini-big bangs or pockets of rebirth.

Penrose's theory is each previous expanding version of the universe eventually being the singularity of the next.

The universe keeps dying and being reborn, claims Nobel Prize winner
 

Read all about it



https://www.audioaficionado.org/atta...2&d=1601919794



By his own admission, some handwaving is going on and some clever hacks with conformal mapping...inspired by Escher’s art (inspiration for Penrose diagrams)



https://www.audioaficionado.org/atta...1&d=1614286646



...and then there is the driving force of increasing entropy...



Oversimplified...at some point in time when the universe is filled with only photons (heath death)...distance and time will become literally meaningless, thanks to some creative use of conformal math, Penrose posits that this state is indistinguishable from a state that would precurse a big bang scenario. How entropy fits into this story is open for debate. If he is right, there is no need for inflation, the inflaton field/inflaton particle and a certain flavor of multiverses that would be inevitable with eternal inflation.



His ideas are not widely accepted and have been successfully challenged...however, it is still a work in progress and who knows, maybe some day the predictions made by the theory pan out.



One should never lose sight of the fact that all cosmological theories dealing with the origins and end of the universe are speculative. Of all the theories floating around, this one IMHO, is the most elegant at best and the least convoluted at worst.

To make a very unscientific observation... CCC has an intrinsically poetic beauty...it offers a quantum of solace by making endings new beginnings. Sabine Hossenfelder (I’m a fan) would certainly disagree with that sentiment.

Good stuff Jacques. Yes, it’s all theories but it still underlines that nothing is infinite. Certainly not our star, not our planet and least of all, us, the inhabitants.

Would be good to see people spending more time wishing each other well and doing good deeds while being here for a blip of time on a cosmic scale of things instead of being focused on the negatives.

Philosophically speaking, perhaps the “great reset”, our universe included, ensures a fresh start, no matter what has evolved and in case things get out of control. :smoking: