J. Lehners, P. Steinhardt, and N. Turok. (2009)cite arxiv:0910.0834
Comment: 5 pages, Honorable Mention at the 2009 Gravity Research Foundation
essay competition.
B. Craps, T. Hertog, and N. Turok. (2007)cite arxiv:0712.4180
Comment: 91 pages, 24 figures; minor reorganization of introduction,
clarifying comments throughout.