# The idea of the universe repeating itself is troubling me

1. May 25, 2014

### DarkFalz

I've recently read some posts about the universe repeating itself, or even the possibility of some states of the universe repeating themselves and it troubles me. I cant cope with the idea that someday i may go to the street and find today equal to yesterday or to some other day. This would seem impossible at first because everyone ages from day to day, but is there a way to prove that it is physically impossible for such as situation to happen? Given the enormos amount of physical transformations that occur each day it seems unlikely that a previous state of earth could be restored.

2. May 25, 2014

### Astronuc

Staff Emeritus
Ignore posts that speculate on the universe repeating itself.

In the 20675 days I've been in this life, I've never seen a day repeat itself, nor an hour, minute or second.

3. May 25, 2014

From where did you read that?

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https://www.physicsforums.com/blog.php?b=2703 [Broken]

Last edited by a moderator: May 6, 2017
4. May 25, 2014

### DarkFalz

Is it provable still?

5. May 25, 2014

### DarkFalz

Last edited by a moderator: May 6, 2017
6. May 25, 2014

### Staff: Mentor

7. May 25, 2014

### DarkFalz

But can the whole topic be considered philosophy? Is there something in the current physic theories that dictate the impossibility of such happening?

8. May 25, 2014

### Staff: Mentor

Is this the scenario you are interested in?

http://www.space.com/8066-big-bang-solid-theory-mysteries-remain.html

I've read that the "cyclic universe" has been debunked, which points back to Astronuc's post above.

Last edited: May 25, 2014
9. May 25, 2014

### DarkFalz

I was considered smaller scope situation. My question is if it is possible for a set of particles, for instance ALL of earth particles to rearrange themselves once more in the same configuration that they were, for instance, in the Medieval time, without a new big bang occurring meanwhile. Like in 1000 years all of Earth's particles rearranging themselves in the same manner they were in 1658 for instance.

10. May 25, 2014

This will never occur. Have you see anyone from A.D 1014 recently?
According to you, this battle happened recently

Also see this: http://en.wikipedia.org/wiki/Parallel_universe_(fiction [Broken])
http://en.wikipedia.org/wiki/Multiverse
http://en.wikipedia.org/wiki/Cyclic_model

Last edited by a moderator: May 6, 2017
11. May 25, 2014

### ZombieFeynman

I can easily calculate the probability. Zero.

12. May 25, 2014

### DarkFalz

How?

13. May 25, 2014

If you are 100% sure that an even will occur, the probability is $1$. If you are 100% sure that the event will Not occur, the probability is $0$