Are the neutrons leaking into our universe from another? Original study, followup of ArxivBlog and recent one at New Scientist (open access).
This is just another example of breaktrough observation, which has been done already by accident. It's rather difficult to assume, that the heavy particles like the neutrons could be a subject of quantum oscillations as a whole or even that they could completely evaporate from out sight. But the problem is somewhere else: because the neutrons lack the electric charge, their detection relies on presence of weak charge only, which could be a subject of oscillations inside of neutrons in similar way like a the case of neutrinos at free cosmic space. I.e. it's not a neutron what does oscillate here, but the weak charge inside of it. It should be noted, that the ultracold neutrons are surprisingly well reflected with 58-Ni isotope, which could have a close relation to the cold fusion mechanism, proposed by Widom-Larsen theory. The size/density of nickel atoms may be tuned in such a way, the volume waves of electron orbital resonate with surface waves of atom nuclei (there is strong isotopic effect for neutron optical potential).
Regarding the brane world hypothesis, I don't see any reason why not to consider the common oscillations of neutrinos or even decoherence of photons and quantum oscillations as a whole as the evidence of it.