A few years ago, physicists showed that it might be theoretically possible for neutrons to make the leap from our universe to a different one if the gravitational potential of an entire galaxy were involved. Lucky for us, we happen to live in a galaxy so if we look closely enough, it should be possible to spot these neutrons jumping out of our galaxy.
By watching a bunch of neutrons all at once, we might be able to experimentally verify whether any of them are disappearing off to alternate universes.
How Neutrons Might Escape Into Another Universe:
http://www.technologyreview.com/blog/arxiv/27517/
Attached is the full text for the publication:
Experimental limits on neutron disappearance into another braneworld.
Michael Sarrazin, Guillaume Pignol, Fabrice Petit, Valery V. Nesvizhevsky
"Recent theoretical works have shown that matter swapping between two 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."
Thoughts?