A Caltech Library Service

A status report on the observability of cosmic bubble collisions

Aguirre, Anthony and Johnson, Matthew C. (2011) A status report on the observability of cosmic bubble collisions. Reports on Progress in Physics, 74 (7). Art. No. 074901. ISSN 0034-4885. doi:10.1088/0034-4885/74/7/074901.

Full text is not posted in this repository. Consult Related URLs below.

Use this Persistent URL to link to this item:


In the picture of eternal inflation as driven by a scalar potential with multiple minima, our observable universe resides inside one of many bubbles formed from transitions out of a false vacuum. These bubbles necessarily collide, upsetting the homogeneity and isotropy of our bubble interior, and possibly leading to detectable signatures in the observable portion of our bubble, potentially in the cosmic microwave background or other precision cosmological probes. This constitutes a direct experimental test of eternal inflation and the landscape of string theory vacua. Assessing this possibility roughly splits into answering three questions: What happens in a generic bubble collision? What observational effects might be expected? How likely are we to observe a collision? In this review we report the current progress on each of these questions, improve upon a few of the existing results and attempt to lay out directions for future work.

Item Type:Article
Related URLs:
URLURL TypeDescription
Johnson, Matthew C.0000-0002-5099-8185
Additional Information:© 2011 IOP Publishing Ltd. Received 12 October 2009, in final form 8 February 2010; Published 17 June 2011. The authors wish to thank A Dahlen, R Easther, B Freivogel, J T Giblin, M Kleban, A Lewis, E Lim, J Niemeyer, H Peiris, K Sigurdson and P Steinhardt for helpful conversations. AA was supported by NSF grant PHY-0757912, and a ‘Foundational Questions in Physics and Cosmology’ grant from the Templeton Foundation. MJ’s research is funded by the Gordon and Betty Moore Foundation, and thanks the Aspen Center for Physics, UC Santa Cruz, the Perimeter Institute and the Abdus Salam ICTP for their hospitality while portions of this work were completed.
Group:Caltech Theory, Moore Center for Theoretical Cosmology and Physics
Funding AgencyGrant Number
Templeton Foundation 'Foundational Questions in Physics and Cosmology’ grantUNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
Issue or Number:7
Classification Code:PACS: 98.80.Es; 98.58.Kh; 98.80.Cq; 98.70.Vc
Record Number:CaltechAUTHORS:20110713-155535882
Persistent URL:
Official Citation:A status report on the observability of cosmic bubble collisions Anthony Aguirre and Matthew C Johnson 2011 Rep. Prog. Phys. 74 074901
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:24415
Deposited On:14 Jul 2011 14:37
Last Modified:12 Jul 2022 19:44

Repository Staff Only: item control page