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New study finds no sign of entanglement with other universes

18 Jun 2016, 13:42 UTC
New study finds no sign of entanglement with other universes
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Somewhere in the multiverseyou’re having a good day.The German Autobahn is famous for its lack of speed limits, and yet the greatest speed limit of all comes from a German: Nothing, Albert Einstein taught us, is allowed to travel faster than light. This doesn’t prevent our ideas from racing, but sometimes it prevents us from ticketing them.If we live in an eternally inflating multiverse that contains a vast number of universes, then the other universes recede from us faster than light. We are hence “causally disconnected” from the rest of the multiverse, separated from the other universes by the ongoing exponential expansion of space, unable to ever make a measurement that could confirm their existence. It is this causal disconnect that has lead multiverse critics to complain the idea isn’t within the realm of science.There are however some situations in which a multiverse can give rise to observable consequences. One is that our universe might in the past have collided with another universe, which would have left a tell-tale signature in the cosmic microwave background. Unfortunately, no evidence for this has been found.Another proposal for how to test the multiverse is to exploit the subtle non-locality that quantum mechanics gives ...

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