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Surviving the crash: Assessing the aftermath of cosmic bubble collisions

Aguirre, Anthony and Johnson, Matthew C. and Tysanner, Martin (2009) Surviving the crash: Assessing the aftermath of cosmic bubble collisions. Physical Review D, 79 (12). p. 123514. ISSN 2470-0010.

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This paper is the third in a series investigating the possibility that if we reside in an inflationary “bubble universe,” we might observe the effects of collisions with other such bubbles. Here, we study the interior structure of a bubble collision spacetime, focusing on the issue of where observers can reside. Numerical simulations indicate that if the interbubble domain wall accelerates away, infinite spacelike surfaces of homogeneity develop to the future of the collision; this strongly suggests that observers can have collisions to their past, and previous results then imply that this is very likely. However, for observers at nearly all locations, the restoration of homogeneity relegates any observable effects to a vanishingly small region on the sky. We find that bubble collisions may also play an important role in defining measures in inflation: a potentially infinite relative volume factor arises between two bubble types depending on the sign of the acceleration of the domain wall between them; this may in turn correlate with observables such as the scale or type of inflation.

Item Type:Article
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Johnson, Matthew C.0000-0002-5099-8185
Additional Information:© 2009 The American Physical Society. Received 23 January 2009; published 22 June 2009. The authors wish to thank T. Banks, S. Carroll, M. PACS: 98.80.Cq Kleban, and M. Salem for helpful discussions. M. J. acknowledges support from the Moore Center for Theoretical Cosmology at Caltech. A. A. and M. T. were partially supported by a "Foundational Questions in Physics and Cosmology" grant from the Templeton Foundation and NSF Grant No. PHY-0757912 during the course of this work.
Group:Moore Center for Theoretical Cosmology and Physics
Funding AgencyGrant Number
Foundational Questions in Physics and CosmologyUNSPECIFIED
Templeton FoundationUNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
Issue or Number:12
Record Number:CaltechAUTHORS:20090804-083645740
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:14779
Deposited By: Ruth Sustaita
Deposited On:01 Sep 2009 22:21
Last Modified:09 Mar 2020 13:18

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