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First Observational Tests of Eternal Inflation · Around

2010

First Observational Tests of Eternal Inflation

Feeney, Stephen M., Johnson, Matthew C., Mortlock, Daniel J. et al.

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The eternal inflation scenario predicts that our observable universe resides inside a single bubble embedded in a vast inflating multiverse.

We present the first observational tests of eternal inflation, performing a search for cosmological signatures of collisions with other bubble universes in cosmic microwave background data from the WMAP satellite.
We conclude that the WMAP 7-year data do not warrant augmenting LCDM with bubble collisions, constraining the average number of detectable bubble collisions on the full sky to be less than 1.6 at 68% CL.
Data from the Planck satellite can be used to more definitively test the bubble collision hypothesis.

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