See Tegmark’s “Multiverse Hierarchy”: http://arxiv.org/pdf/0905.1283.pdf Also there has been good work done showing that a spatial Big Universe is a realization of the quantum multiverse in 3 spatial dimensions. http://blogs.discovermagazine.com/cosmicvariance/2011/05/26/are-many-worlds-and-the-multiverse-the-same-idea/
See Tegmark’s “Multiverse Hierarchy”: http://arxiv.org/pdf/0905.1283.pdf Also there has been good work done showing that a spatial Big Universe is a realization of the quantum multiverse in 3 spatial dimensions. http://blogs.discovermagazine.com/cosmicvariance/2011/05/26/are-many-worlds-and-the-multiverse-the-same-idea/