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First Observational Tests of Eternal Inflation

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.

preprint2011arXivOpen access
Stephen M. FeeneyMatthew C. JohnsonDaniel J. MortlockHiranya V. Peiris
astro-ph.COhep-phhep-th
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Stephen M. FeeneyMatthew C. JohnsonDaniel J. MortlockHiranya V. Peiris

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