# Watching worlds collide: effects on the CMB from cosmological bubble collisions

@article{Chang2008WatchingWC, title={Watching worlds collide: effects on the CMB from cosmological bubble collisions}, author={Spencer Chang and Matthew Kleban and Thomas S. Levi}, journal={Journal of Cosmology and Astroparticle Physics}, year={2008}, volume={2009}, pages={025-025} }

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 inside a bubble which has undergone such a collision. We find that the effects are always qualitatively similar—an anisotropy that depends only on the angle to the collision direction—but can produce a cold or hot spot of varying size, as well as power asymmetries along the axis determined by the…

## 65 Citations

### Analyzing cosmic bubble collisions

- Physics
- 2012

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

- Physics
- 2012

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…

### Bubble, Bubble, Flow and Hubble: Large Scale Galaxy Flow from Cosmological Bubble Collisions

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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…

### Simulating the universe(s): from cosmic bubble collisions to cosmological observables with numerical relativity

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The theory of eternal inflation in an inflaton potential with multiple vacua predicts that our universe is one of many bubble universes nucleating and growing inside an ever-expanding false vacuum.…

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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…

### Simulating the universe(s) II: phenomenology of cosmic bubble collisions in full general relativity

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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…

### Simulating the universe(s) III: observables for the full bubble collision spacetime

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- 2015

This is the third paper in a series establishing a quantitative relation between inflationary scalar field potential landscapes and the relic perturbations left by the collision between bubbles…

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We study collisions between pairs of bubbles nucleated in an ambient false vacuum. For the first time, we include the effects of small initial (quantum) fluctuations around the instanton profiles…

### On the fate of vacuum bubbles on matter backgrounds

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### On the fate of vacuum bubbles on matter backgrounds

- PhysicsAnnalen der Physik
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In this letter we discuss cosmological first order phase transitions with de Sitter bubbles nucleating on (inhomogeneous) matter backgrounds. The de Sitter bubble can be a toy model for an…

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