What is the Multiverse, and why do we think it exists? (Synopsis)

“In the confusion we stay with each other, happy to be together, speaking without uttering a single word.” -Walt Whitman

With the new result out from BICEP2, and even more firm evidence for cosmic inflation in place, many of you must be wondering what this means for the Multiverse.

Image credit: Wikimedia Commons users Frédéric MICHEL and Azcolvin429, annotated by me.
Image credit: Wikimedia Commons users Frédéric MICHEL and Azcolvin429, annotated by me.

From our observable Universe, we can learn an awful lot about the part that’s unobservable, but is there anything we can say — intelligently — about other Universes that may have been created as a result of cosmic inflation? As it turns out, even though what we can definitively conclude is limited, there are a number of amazing things we can learn.

Image credit: Mario Livio, via http://www.huffingtonpost.com/mario-livio/how-can-we-tell-if-a-multiverse-exists_b_2285406.html.
Image credit: Mario Livio, via http://www.huffingtonpost.com/mario-livio/how-can-we-tell-if-a-multiverse-exists_b_2285406.html.

For one, I can tell you what the Multiverse is, and why we think it exists! Go and read the whole thing.