# Quilted Multiverse

1. Aug 8, 2011

### daviec

I have a question regarding the Quilted Multiverse which I am reading about in Brian Greene's latest book The Hidden Reality. As I have no formal education I hope does not make me appear stupid as Im sure there is a logical answer, its just I don't know what it is.

When talking about patterns repeating in an infinite universe then logic would dictate that eventually the patterns will repeat ie. we will eventually come across copies of ourselves and so on...

When the Big Bang happened, was this not done with a finite amount of matter - anti matter and if so then if the universe started with a finite amount of matter then how can matter exist in other cosmic horizons that are infinitely or very far away from our cosmic horizon?

Is a finite amount of matter and energy expanding from the big bang into an infinite/finite universe?

I get the bit about paterns repeating as there is only a certain number of ways we can arrange them. I just don't understand how theny can repeat if the big bang only made a finite a mount of matter/energy.

I hope this question is valid and not to have wasted anyones time.

Thanks

Davie

2. Aug 8, 2011

### Chronos

It is not possible [at present] to tell if the universe was finite or infinite when the big bang happened. All we know is the patch we call the observable universe is finite, hence can only include a finite amount of matter, energy and spacetime.

3. Aug 8, 2011

### bcrowell

Staff Emeritus
For more detail on the finite/infinite thing, we have a FAQ: https://www.physicsforums.com/showthread.php?t=506986

If the universe is infinite and homogeneous, then it has an infinite amount of matter. However, we wouldn't be able to verify that it was homogeneous over infinite distances.

4. Aug 9, 2011

### stefanbanev

It's a good observation - such ~near identical copies compose the assembly described by
MWI. The latest work from Bousso & Susskind proposes such insight:

http://arxiv.org/PS_cache/arxiv/pdf/1105/1105.3796v1.pdf

Stefan