Eternal Return

[BrianSoddingBoru4]

Nope. A re-Banged universe will have different physical properties.

Boru

Maybe not
Why can't all universes (if others) all render under one set of physical laws.
I mean, prime numbers, real numbers, fractions, zero, infinity, etc don't change and that's what our maths is based on?
The periodic table of the elements are just elements with 1, 2, 3, etc  protons in them.

A bit like trying to work out the odds of life on other planets. Wildly unreliable with sample sets of one.

Because the chances of a second BB proceeding exactly like the first one are so unlikely as to be untenable. Suppose, for example, it produced no protons at all, or that the expansion was fractionally lesser or greater, or that the temperatures generated were lower.  We'd end up with a universe remarkably dissimilar to this one.

On a smaller scale, Stephen Jay Gould once outlined the history of life as-we-know it on Earth and came up with a dozen different scenarios wherein the tiniest changes would have led to everything from no humans to no life at all.  I imagine a re-do of the universe would be much the same. It's really only a matter of scale.

Boru

[ignoramus]

Not sure about "no protons" though. Even big bangs are bound to quantum framework one would imagine?
Then again, why can't singularities mutate like everything else?

Agree that no 2 universes would be identical. The odds are just ridiculous. Boru, do you imagine a possible universe where there's a Beccs who's nice to me?
Pushing it, I know!

[BrianSoddingBoru4]

Not sure about "no protons" though. Even big bangs are bound to quantum framework one would imagine?
Then again, why can't singularities mutate like everything else?

Agree that no 2 universes would be identical. The odds are just ridiculous. Boru, do you imagine a possible universe where there's a Beccs who's nice to me?
Pushing it, I know!

Well, that’s just crazy talk.

Boru

[viocjit]

Thanks to those who answered to this topic that I created with an entertainment purpose.

If we were living in a simulation. Are we in a full or partial reproduction of a world that already existed or a fiction ?

[Anomalocaris]

When I think about the ultimate fate of the universe.
I think about the possibility of a new big bang identical to the one we had.
If that happens. Does it means we will back and have an identical life with a score of 100% ?
If that happens. Will we have a conscience composed of the same atoms or it will be another us because it would be like a double in a parallel universe.

If the new big bang will create a parallel universe with a double of us ?

Do we live in a simulation ? I don't think so but why not. Maybe the universe is a simulation that is long to run (Calculate the time between big bang and now) at our scale but short for those who are using simulation. Maybe 1 billion year correspond to 1 hour , less or more for those who play with us if we are in a simulation.
How can we be sure we were alive 1 minute ago or if this is not an illusion created by a simulation or a division of an universe in the multiverse ? I think I was really there but ....

Article on Wikipedia about ultimate fate of the universe : https://en.wikipedia.org/wiki/Ultimate_f...e_universe
Article on Wikipedia concerning timeline of the far future : https://en.wikipedia.org/wiki/Timeline_o...far_future
Article on Wikipedia about simulation hypothesis : https://en.wikipedia.org/wiki/Simulation_hypothesis

If a Big Bang identical to us happens, then it follows what will transpire in the resulting universe would be identical to what transpired in ours.   

But the main pertinent facts are we don't really know Why, or how, our Big Bang occurred, nor whether there is room for another Big Bang, nor how many ways there are for a Big Bang to occur, nor if there is any relationship between the way different Big Bangs Occurs.   So I dare say everything around any possible answer to your question is much more speculation than informed guess, and far from well formed theory.

---

It is my (puny, granted) understanding that the universe's rate of expansion is increasing, and so a "big crunch" and subsequent big bang 2(n, really) ain't on the cards.

That assumes our universe was, is and will always be unique, so that if it is not seem to be headed in its entirety In some direction That plausibly leads to another Big Bang, than another Big Bang is not in the cards.

But I think many leading theories do not require our universe to ever have been or ever will be unique,  nor does it require a Big Bang to in principle include all there is, nor indeed include any of what we can see and observe.

[The Grand Nudger]

Thanks to those who answered to this topic that I created with an entertainment purpose.

If we were living in a simulation. Are we in a full or partial reproduction of a world that already existed or a fiction ?

Whaddaya mean 'if'..?  You are living in a simulation.  It's a partial reproduction of your exterior environment but also, meaningfully, fiction.

[Mister Agenda]

Maybe not
Why can't all universes (if others) all render under one set of physical laws.
I mean, prime numbers, real numbers, fractions, zero, infinity, etc don't change and that's what our maths is based on?
The periodic table of the elements are just elements with 1, 2, 3, etc  protons in them.

A bit like trying to work out the odds of life on other planets. Wildly unreliable with sample sets of one.

Because the chances of a second BB proceeding exactly like the first one are so unlikely as to be untenable. Suppose, for example, it produced no protons at all, or that the expansion was fractionally lesser or greater, or that the temperatures generated were lower.  We'd end up with a universe remarkably dissimilar to this one.

On a smaller scale, Stephen Jay Gould once outlined the history of life as-we-know it on Earth and came up with a dozen different scenarios wherein the tiniest changes would have led to everything from no humans to no life at all.  I imagine a re-do of the universe would be much the same. It's really only a matter of scale.

Boru

Not disagreeing, just commenting because you've given food for thought.

It is certainly unlikely that events will unfold exactly the same way after the BB, but it's possible that the physical properties of the universe are not unrestrained and can't be just anything. It may be that any universe that can exist would be pretty similar to ours, at least as far as the laws of physics go. Of course it may also be that they can vary wildly, but the vacuum fluctuation model of the origin of the universe suggests that at least the physical laws have to be such that the net energy of the universe will be practically zero, which would be a major constraint.

I agree that on the smaller scale, even a re-do that preserves physical properties would have different outcomes due to even tiny changes having a great long term impact.

I think the only way one could be identical to ours to the extent that all the people in our world are re-iterated would be if there were so many universes that duplication could happen by chance, but I can't imagine how many digits would have to be in the number of universes for that to be a probability.