Analyzing Cosmic Bubble Collisions

@article{Gobbetti2012AnalyzingCB,
  title={Analyzing Cosmic Bubble Collisions},
  author={Roberto Gobbetti and Matthew Kleban},
  journal={Journal of Cosmology and Astroparticle Physics},
  year={2012},
  volume={2012},
  pages={025-025}
}
We develop a set of controlled, analytic approximations to study the effects of bubble collisions on cosmology. We expand the initial perturbation to the inflaton field caused by the collision in a general power series, and determine its time evolution during inflation in terms of the coefficients in the expansion. In models where the observer's bubble undergoes sufficient slow-roll inflation to solve the flatness problem, in the thin wall limit only one coefficient in the expansion is relevant… 

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References

SHOWING 1-10 OF 49 REFERENCES
Watching worlds collide: effects on the CMB from cosmological bubble collisions
We extend our previous work on the cosmology of Coleman-de Luccia bubble collisions. Within a set of approximations we calculate the effects on the cosmic microwave background (CMB) as seen from
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
Determining the outcome of cosmic bubble collisions in full General Relativity
Cosmic bubble collisions provide an important possible observational window on the dynamics of eternal inflation. In eternal inflation, our observable universe is contained in one of many bubbles
Bubble, Bubble, Flow and Hubble: Large Scale Galaxy Flow from Cosmological Bubble Collisions
We study large scale structure in the cosmology of Coleman-de Luccia bubble collisions. Within a set of controlled approximations we calculate the effects on galaxy motion seen from inside a bubble
Eternal inflation, bubble collisions, and the disintegration of the persistence of memory
We compute the probability distribution for bubble collisions in an inflating false vacuum which decays by bubble nucleation. Our analysis generalizes previous work of Guth, Garriga, and Vilenkin to
Cosmic Bubble Collisions
I briefly review the physics of cosmic bubble collisions in false-vacuum eternal inflation. My purpose is to provide an introduction to the subject for readers unfamiliar with it, focussing on recent
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
When Worlds Collide
We analyze the cosmological signatures visible to an observer in a Coleman-de Luccia bubble when another such bubble collides with it. We use a gluing procedure to generalize the results of
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
Observable effects of anisotropic bubble nucleation
Our universe may have formed via bubble nucleation in an eternally-inflating background. Furthermore, the background may have a compact dimension — the modulus of which tunnels out of a metastable
...
1
2
3
4
5
...