The multiverse under fire

Kaku's multiverse theory questioned by Penrose and Hossenfelder

On day 3 of HowTheLightGetsIn at Hay, an extraordinary panel of theoretical physicists debated the reality of the multiverse. Nobel prize-winner Roger Penrose, string theory pioneer Michio Kaku, and quantum gravity researcher Sabine Hossenfelder, argued over whether the idea that our universe is one of many can be taken to be a scientific claim, backed up by observational evidence, or whether it’s merely a popular fiction.

 

Our universe isn’t the only one. It’s one of many, an infinite number of other universes, some of which are very similar to our own with only minute differences, others in which space has more than three dimensions, and others still in which the laws of physics themselves are completely different. Sounds like a crackpot theory, something someone came up with when high on drugs. In fact, it’s a serious proposal by theoretical physicists and goes by the name the multiverse. But does the fact that it’s a theory put forward by scient

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