Parallel Universes (http://www.sciam.com/article.cfm?colID=1&articleID=000F1EDD-B48A-1E90-8EA5809EC5880000)
Fine-tuning, Multiple Universes, and the "This Universe" Objection (http://209.85.173.104/search?q=cache:tnm8Z85wRmIJ:home.olemiss.edu/~namanson/This%2520Universe.pdf+multiple+universe&hl=en&ct=clnk&cd=9&gl=us)
Philosophical Implications of Inflationary Cosmology (http://bjps.oxfordjournals.org/cgi/content/abstract/57/1/47)
In the Matrix: Martin Rees (http://www.edge.org/3rd_culture/rees03/rees_index.html)
QuoteAll these multiverse ideas lead to a remarkable synthesis between cosmology and physics...But they also lead to the extraordinary consequence that we may not be the deepest reality, we may be a simulation. The possibility that we are creations of some supreme, or super-being, blurs the boundary between physics and idealist philosophy, between the natural and the supernatural, and between the relation of mind and multiverse and the possibility that we're in the matrix rather than the physics itself.