A Status report on the observability of cosmic bubble collisions

@article{Aguirre2011ASR,
  title={A Status report on the observability of cosmic bubble collisions},
  author={Anthony Aguirre and Matthew Camp Johnson},
  journal={Reports on Progress in Physics},
  year={2011},
  volume={74},
  pages={074901}
}
In the picture of eternal inflation as driven by a scalar potential with multiple minima, our observable universe resides inside one of many bubbles formed from transitions out of a false vacuum. These bubbles necessarily collide, upsetting the homogeneity and isotropy of our bubble interior, and possibly leading to detectable signatures in the observable portion of our bubble, potentially in the cosmic microwave background or other precision cosmological probes. This constitutes a direct… 
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References

SHOWING 1-10 OF 80 REFERENCES
Towards observable signatures of other bubble universes
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
Towards observable signatures of other bubble universes. II. Exact solutions for thin-wall bubble collisions
We assess the effects of a collision between two vacuum bubbles in the thin-wall limit. After describing the outcome of a generic collision possessing the expected hyperbolic symmetry, we focus on
Eternal inflation: the inside story
Motivated by the lessons of black hole complementarity, we develop a causal patch description of eternal inflation. We argue that an observer cannot ascribe a semiclassical geometry to regions
Eternal inflation, bubble collisions and the persistence of memory
A 'bubble universe' nucleating in an eternally inflating false vacuum will experience, in the course of its expansion, collisions with an infinite number of other bubbles. In an idealized model, we
Predictions in eternal inflation
In generic models of cosmological inflation, quantum fluctuations strongly influence the spacetime metric and produce infinitely many regions where the end of inflation (reheating) is delayed until
When do colliding bubbles produce an expanding universe
It is intriguing to consider the possibility that the big bang of the standard (3+1)-dimensional cosmology originated from the collision of two branes within a higher dimensional spacetime, leading
Dynamics and instability of false vacuum bubbles
This paper examines the classical dynamics of false-vacuum regions embedded in surrounding regions of true vacuum, in the thin-wall limit. The dynamics of all generally relativistically allowed
Vacuum bubble in an inhomogeneous cosmology
We study the propagation of bubbles of new vacuum in a radially inhomogeneous Lemaitre-Tolman-Bondi background that includes a cosmological constant. This exemplifies the classical evolution of a
...
1
2
3
4
5
...