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Towards observable signatures of other bubble universes · Around

2007

Towards observable signatures of other bubble universes

Aguirre, Anthony, Johnson, Matthew C, Shomer, Assaf

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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 under certain assumptions most positions inside a bubble should have access to a large number of collision events.
We calculate the expected number and angular size distribution of such collisions on an observer's "sky," finding that for typical observers the distribution is anisotropic and includes many bubbles, each of which will affect the majority of the observer's sky.
After a qualitative discussion of the physics involved in collisions between arbitrary bubbles, we evaluate the implications of our results, and outline possible detectable effects.

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