A friend on Facebook recently asked why multiple universes exist. Not just why they are possible, but why do some physicists think that it's probable that they exist. I replied on Facebook, and decided it was an excellent topic to write an article about. In short, the answer is:
Without multiple universes, it's very unlikely that the universe would have anything interesting in it.
You can check out my lengthier response in our new article Why Are There Multiple Universes?


Comments
Andrew,
Once again I really liked your article “Why Multiple Universes?” I found it to be timely since I’m currently writing an article “The Three S’s of Science and the Physics of Humpty Dumpty” for my website http://antspub.com .
MU theories currently belong in a category I refer to as “Speculative” science. These theories are suggested by authors as answers to one or more scientific problems but are without observational/detectional support. When a speculative theory gets bolstered by observational or experimental data then it can move towards the “Solid” “Supported” or “Sound” Science category. There are other issues but without “speculative” science the process of overall science would probably screech to a halt.
One thing to keep in mind is some theorist mistakenly refer to their speculative theory as if it were part of “supported or sound science” when it isn’t.
There are several other theories that belong in the speculative science category such as “The Hawking radiation” & “the Anthropic Principle.” I also discuss these and other speculative theories in my article. When it is posted you will be able to download it for free in pdf format. I will post another comment when “The Three S’s of Science & the Physics of Humpty Dumpty” is available.
Ken Koskinen
Well,
As I promised in my previous comment my 25 page essay “The Three S’s of Science & the Physics of Humpty Dumpty” is now freely available on my website http://antspub.com . Click on the “Downloads” button on any page and chose the last item on the menu.
I hope you enjoy reading it as much as I did writing it.
Ken Koskinen
what is the main work of physicists after obtaining first degree in physics what areas can you work.