First observational tests of eternal inflation.

@article{Feeney2011FirstOT,
  title={First observational tests of eternal inflation.},
  author={S. Feeney and M. Johnson and D. Mortlock and H. Peiris},
  journal={Physical review letters},
  year={2011},
  volume={107 7},
  pages={
          071301
        }
}
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 the cold dark matter model with a cosmological constant with bubble collisions… Expand
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