You can see the shadow of other universes using little more than a light source and two metal plates. This is the famous double-slit experiment, the touchstone of quantum weirdness.
Particles from the atomic realm such as photons, electrons or atoms are fired at the first plate, which has two vertical slits in it. The particles that go through hit the second plate on the far side.
Imagine the places that are hit show up black and that the places that are not hit show up white. After the experiment has been running for a while, and many particles have passed through the slits, the plate will be covered in vertical stripes alternating black and white. That is an interference pattern.
To make it, particles that passed through one slit have to interfere with particles that passed through the other slit. The pattern simply does not form if you shut one slit.
The strange thing is that the interference pattern forms even if particles come one at a time, with long periods in between. So what is affecting these single particles?
According to the many worlds interpretation, each particle interferes with another particle going through the other slit. What other particle? “Another particle in a neighboring universe,” says David Deutsch. He believes this is a case where two universes split apart briefly, within the experiment, then come back together again. “In my opinion, the argument for the many worlds was won with the double-slit experiment. It reveals interference between neighboring universes, the root of all quantum phenomena.”
watch a tongue in cheek version on u tube
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