We share a common space-time with everything that we interact with in our world. An island universe would be a spatiotemporally interrelated segment of reality that is isolated from the rest of reality; it would be part of our world but something that we cannot interact with. Spatiotemporal interrelatedness plays an important role in a number of metaphysical theories concerning possible worlds. Here I discuss four problems surrounding the possibility of island universes. I contend the most troubling of these problems gives us good reason to think that island universes are possible; metaphysical theories that cannot make sense of the possibility of island universes end up having bizarre implications about alternate possible worlds.
Simkulet, William, "Island Universe Problems" (2014). Philosophy and Religious Studies Department Faculty Publications. 4.
This article has been accepted for publication in Praxis, Volume 4, Issue 2, 2014, 43-63. http://praxisjp.org/