Aguirre, Anthony and Johnson, Matthew C. (2008) Towards observable signatures of other bubble universes. II. Exact solutions for thin-wall bubble collisions. Physical Review D, 77 (12). Art. No. 123536. ISSN 0556-2821 http://resolver.caltech.edu/CaltechAUTHORS:AGUprd08
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We assess the effects of a collision between two vacuum bubbles in the thin-wall limit. After describing the outcome of a generic collision possessing the expected hyperbolic symmetry, we focus on collisions experienced by a bubble containing positive vacuum energy, which could in principle contain our observable universe. We provide criteria governing whether the post-collision domain wall accelerates towards or away from this observation bubble, and discuss the implications for observers located at various positions inside of the bubble. Then, we identify the class of solutions which have minimal impact on the interior of the observation bubble, and derive a simple formula for the energy density of a shell of radiation emitted from such a collision. In the context of a universe undergoing false-vacuum eternal inflation, these solutions are perhaps the most promising candidates for collisions that could exist within our past light cone, and therefore in principle be observable.
|Additional Information:||©2008 The American Physical Society. (Received 13 February 2008; published 25 June 2008) The authors wish to thank T. Banks, R. Bousso, B. Freivogel, and S. Shenker for helpful discussions as well as Marty Tysanner for useful comments on the draft. M.J. acknowledges support from the Moore Center for Theoretical Cosmology at Caltech. A.A. was partially supported by a "Foundational Questions in Physics and Cosmology" grant from the Templeton Foundation during the course of this work.|
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|Deposited On:||15 Jul 2008 19:09|
|Last Modified:||26 Dec 2012 10:09|
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