First observational tests of eternal inflation.

@article{Feeney2011FirstOT,
  title={First observational tests of eternal inflation.},
  author={Stephen M. Feeney and Matthew Camp Johnson and Daniel J. Mortlock and Hiranya V. 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… 

Figures from this paper

Analyzing cosmic bubble collisions
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
Analyzing Cosmic Bubble Collisions
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
Simulating the universe(s) II: phenomenology of cosmic bubble collisions in full general relativity
Observing the relics of collisions between bubble universes would provide direct evidence for the existence of an eternally inflating Multiverse; the non-observation of such events can also provide
Observing the Multiverse with Cosmic Wakes
Current theories of the origin of the Universe, including string theory, predict the existence of a multiverse containing many bubble universes. These bubble universes will generically collide, and
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
Observable signatures of a classical transition
Eternal inflation arising from a potential landscape predicts that our universe is one realization of many possible cosmological histories. One way to access different cosmological histories is via
Optimal filters for detecting cosmic bubble collisions
TLDR
This article presents an improved algorithm for detecting candidate sources using optimal filters, and applies it to detect candidate bubble collision signatures in WMAP 7-year observations, showing an enhancement in sensitivity over previous methods by a factor of approximately two.
Bubble collisions and measures of the multiverse
To compute the spectrum of bubble collisions seen by an observer in an eternally-inflating multiverse, one must choose a measure over the diverging spacetime volume, including choosing an "initial"
Bubble collisions and measures of the multiverse
To compute the spectrum of bubble collisions seen by an observer in an eternally-inflating multiverse, one must choose a measure over the diverging spacetime volume, including choosing an ``initial''
Gravity waves from cosmic bubble collisions
Our local Hubble volume might be contained within a bubble that nucleated in a false vacuum with only two large spatial dimensions. We study bubble collisions in this scenario and find that they
...
...

References

SHOWING 1-10 OF 13 REFERENCES
Data analysis : a Bayesian tutorial
TLDR
This tutorial jumps right in to the power ofparameter estimation without dragging you through the basic concepts of parameter estimation.
and M
  • Bridges,
  • 2008
I and J
Pattern Anal
  • Mach. Intell. 8, 679
  • 1986
JCAP 0904
  • 025
  • 2009
Commun
  • ACM 18, 120
  • 1975
Phys
  • Rev. D76, 063509
  • 2007
Astropart
  • Phys. 04
  • 2009
arXiv:0707.0844 [astro-ph
  • 2007
and H
  • V. Peiris,
  • 2010
...
...