Future foam: Nontrivial topology from bubble collisions in eternal inflation

@article{Bousso2008FutureFN,
  title={Future foam: Nontrivial topology from bubble collisions in eternal inflation},
  author={Raphael Bousso and Ben Freivogel and Yasuhiro Sekino and Stephen H. Shenker and Leonard Susskind and I-Sheng Yang and Chen-Pin Yeh},
  journal={Physical Review D},
  year={2008},
  volume={78},
  pages={063538}
}
We study pocket universes which have zero cosmological constant and nontrivial boundary topology. These arise from bubble collisions in eternal inflation. Using a simplified dust model of collisions we find that boundaries of any genus can occur. Using a radiation shell model we perform analytic studies in the thin-wall limit to show the existence of geometries with a single toroidal boundary. We give plausibility arguments that higher genus boundaries can also occur. In geometries with one… 

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