Abstract
DOI: http://dx.doi.org/10.1103/RevModPhys.84.1165 Received 4 October 2011Published 13 August 2012© 2012 Nobel Foundation, Published by The American Physical Society *The 2011 Nobel Prize for Physics was shared by Saul Perlmutter, Adam G. Riess, and Brian P. Schmidt. These papers are the text of the address given in conjunction with the award.