Towards observable signatures of other bubble universes

@article{Aguirre2007TowardsOS,
  title={Towards observable signatures of other bubble universes},
  author={Anthony Aguirre and Matthew Camp Johnson and Assaf Shomer},
  journal={Physical Review D},
  year={2007},
  volume={76},
  pages={063509}
}
We evaluate the possibility of observable effects arising from collisions between vacuum bubbles in a universe undergoing false-vacuum eternal inflation. Contrary to conventional wisdom, we find that under certain assumptions most positions inside a bubble should have access to a large number of collision events. We calculate the expected number and angular size distribution of such collisions on an observer's "sky," finding that for typical observers the distribution is anisotropic and… 
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