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2012

Multiple Cosmic Collisions and the Microwave Background Power Spectrum

Kozaczuk, Jonathan, Aguirre, Anthony

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Collisions between cosmic bubbles of different vacua are a generic feature of false vacuum eternal inflation scenarios.

While previous studies have focused on the consequences of a single collision event in an observer's past, we begin here an investigation of the more general scenario allowing for many "mild" collisions intersecting our past light cone (and one another).
We discuss the general features of multiple collision scenarios and consider their impact on the cosmic microwave background (CMB) temperature power spectrum, treating the collisions perturbatively.
In a large class of models, one can approximate a multiple collision scenario as a superposition of individual collision events governed by nearly isotropic and scale-invariant distributions, most appearing to take up less than half of the sky.

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