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2011

Observing the Multiverse with Cosmic Wakes

Kleban, Matthew, Levi, Thomas S., Sigurdson, Kris

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Current theories of the origin of the Universe, including string theory, predict the existence of a multiverse containing many bubble universes.

These bubble universes will generically collide, and collisions with ours produce cosmic wakes that enter our Hubble volume, appear as unusually symmetric disks in the cosmic microwave background (CMB) and disturb large scale structure (LSS).
There is preliminary observational evidence consistent with one or more of these disturbances on our sky.
However, other sources can produce similar features in the CMB temperature map and so additional signals are needed to verify their extra-universal origin.

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R. Sachs
1967
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S. W. Hawking
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1995
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1997
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