When Worlds Collide
arXiv:0712.2261 · doi:10.1088/1475-7516/2008/04/034
Abstract
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 Freivogel, Horowitz, and Shenker to the case of a general cosmological constant in each bubble and study the resulting spacetimes. The collision breaks the isotropy and homogeneity of the bubble universe and provides a cosmological "axis of evil" which can affect the cosmic microwave background in several unique and potentially detectable ways. Unlike more conventional perturbations to the inflationary initial state, these signatures can survive even relatively long periods of inflation. In addition, we find that for a given collision the observers in the bubble with smaller cosmological constant are safest from collisions with domain walls, possibly providing another anthropic selection principle for small positive vacuum energy.
25 pages, 9 figures
References in corpus (7)
- Three-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Temperature Analysis
- The Anthropic Landscape of String Theory
- Eternal Inflation: The Inside Story
- Towards observable signatures of other bubble universes
- Eternal inflation, bubble collisions, and the persistence of memory
- Colliding with a Crunching Bubble
- Transitions Between de Sitter Minima
Cited by in corpus (53)
- How to Run Through Walls: Dynamics of Bubble and Soliton Collisions
- First Observational Tests of Eternal Inflation: Analysis Methods and WMAP 7-Year Results
- A New Mechanism for Bubble Nucleation: Classical Transitions
- Watching Worlds Collide: Effects on the CMB from Cosmological Bubble Collisions
- Determining the outcome of cosmic bubble collisions in full General Relativity
- Towards observable signatures of other bubble universes II: Exact solutions for thin-wall bubble collisions
- Unwinding Inflation
- Cosmic Bubble Collisions
- Surviving the crash: assessing the aftermath of cosmic bubble collisions
- Eternal Inflation, Bubble Collisions, and the Disintegration of the Persistence of Memory
- Cosmic bubble and domain wall instabilities III: The role of oscillons in three-dimensional bubble collisions
- Towards the cold atom analog false vacuum
- Polarizing Bubble Collisions
- Cosmic bubble and domain wall instabilities I: parametric amplification of linear fluctuations
- Observable effects of anisotropic bubble nucleation
- Simulating the universe(s): from cosmic bubble collisions to cosmological observables with numerical relativity
- Observing the Dimensionality of Our Parent Vacuum
- Odds of observing the multiverse
- Optimal filters for detecting cosmic bubble collisions
- Analyzing Cosmic Bubble Collisions
- Observing the Multiverse with Cosmic Wakes
- Escaping the crunch: gravitational effects in classical transitions
- Can we detect Hot or Cold spots in the CMB with Minkowski Functionals?
- Simulating the universe(s) II: phenomenology of cosmic bubble collisions in full General Relativity
- Bubble collision with gravitation
- Dynamics of false vacuum bubbles with nonminimal coupling
- Bubble collisions and measures of the multiverse
- The Multiverse in an Inverted Island
- The Cosmological Constant Problem and Inflation in the String Landscape
- Bubble Clustering in Cosmological First Order Phase Transitions
- Bubble, Bubble, Flow and Hubble: Large Scale Galaxy Flow from Cosmological Bubble Collisions
- Vacuum Bubble in an Inhomogeneous Cosmology
- Barnacles -- A Novel Channel for Vacuum Decay
- Oscillating instantons as homogeneous tunneling channels
- Inflaton Two-Point Correlation in the Presence of a Cosmic String
- A signature of anisotropic bubble collisions
- Multiple Cosmic Collisions and the Microwave Background Power Spectrum
- Preheating in Bubble Collisions
- Dark Energy Cosmology with the Alternative Cosmic Microwave Background Data
- Searches for other vacua I: bubbles in our universe
- Gravitational waves from cosmic bubble collisions
- Initial Conditions for Bubble Universes
- Restrictions on infinite sequences of type IIB vacua
- de Sitter Space Decay and Cosmological Constant Relaxation in Unimodular Gravity with Charged Membranes
- Topological Defects from the Multiverse
- Observable Signatures of a Classical Transition
- Gravity waves from cosmic bubble collisions
- Membrane nucleation rates from holography
- Multiverse rate equation including bubble collisions
- Towards Friendly Mixed Initiative Procedural Content Generation: Three Pillars of Industry
- Forecasting constraints from the cosmic microwave background on eternal inflation
- Tachyonic Quintessence and a Preferred Direction in the Sky
- Conservation laws for colliding branes with induced gravity