you don’t need exotic theories to conjure multiverses. standard cosmology postulates that all possible quantum states (10^10^150), or world histories, actually play out. therefore, elvis is still alive (somewhere).
2007-01-28:

nice visualization of the multiverse.
2009-01-22: galaxy clusters racing at up to 1000 km / s – far faster than our best understanding of cosmology allows. Stranger still, every cluster seems to be rushing toward a small patch of sky between the constellations of Centaurus and Vela.
2012-01-23:

Recent theoretical works have shown that matter swapping between 2 parallel braneworlds could occur under the influence of magnetic vector potentials. In our visible world, galactic magnetism possibly produces a huge magnetic potential. As a consequence, this paper discusses the possibility to observe neutron disappearance into another braneworld in certain circumstances. The setup under consideration involves stored ultracold neutrons – in a vessel – which should exhibit a non-zero probability p to disappear into an invisible brane at each wall collision. An upper limit of p is assessed based on available experimental results. This value is then used to constrain the parameters of the theoretical model. Possible improvements of the experiments are discussed, including enhanced stimulated swapping by artificial means. The leap from our universe to another is theoretically possible. And the technology to test the idea is available today

that experiment sounds like nobel prize material.
2013-04-03: as good as any (perhaps even on the better side) episode of minutephysics

2015-05-28:

many physicists have come to doubt the very logic of nature’s laws. Increasingly, they worry that our universe might just be a random, rather bizarre permutation among uncountable other possible universes — an effective dead end in the quest for a coherent theory of nature

2015-08-11:

“A lot of people claim that you can never empirically test a claim like the multiverse because by definition you can only see what’s in our universe. But I think that’s much too quick.” Certain fundamental laws, which we can empirically prove in our own universe, might mathematically predict the existence of other universes. These laws would therefore be indirect, but compelling evidence of the existence of other universes.

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