Astrophysicist Paul Sutter explains
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00:00Do we live in a multiverse? No. I mean, yes. I mean, uh, maybe. Look, it's kind of complicated
00:11and we're not exactly sure. I'm Paul Sutter and this is Paul Explains, the show where I,
00:18you know, explain. First, let's define what we mean by multiverse. We have the universe,
00:26which is by definition all the things. It's all the stars, all the planets, all the people
00:33and aliens. It's all the bits of fluff just floating around in the void. It is the entire
00:39thing. It's all the stuff. So in one sense, there's no such thing as the multiverse because
00:46the universe is already defined to be all the things. But maybe there are patches of the
00:55universe that have different physics or different realities. They have different forces or different
01:03particles. And this is what we refer to as the multiverse. Now, do we live in a multiverse?
01:12Maybe, maybe not. One of the most promising ways physically to get a multiverse is through
01:21something called inflation. Inflation is our model of one of the earliest and most momentous
01:29events in the history of the universe. In the inflation model, when our universe was barely
01:36getting started, when it was a billionth of a billionth of a billionth of a billionth of a second
01:41old, it became very large. It went from the size of, say, an atomic nucleus to around the size
01:49of a baseball. And this event has the possibility of never ending, of inflation of the universe
01:59just always getting bigger and bigger and bigger all the time. And what we call the universe is just
02:07one small pocket of that much larger volume of the true universe. And in our little pocket,
02:16when inflation ended for us, we ended up with one set of physics and one set of forces and one set
02:23of particles and one set of reality. But past the confines of our little bubble, the greater universe
02:32is still going, still doing its thing, still inflating, and different pieces of it pinch off on their
02:38own with their own physics. Now, it's possible that inflation can lead to a multiverse. We don't know
02:49if inflation really happened. We suspect it did, but we're not entirely sure. And we're not sure if
02:55inflation demands the existence of a multiverse. It's possible that inflation just happened once
03:02and did it throughout the universe and that this is it. Or not. We've looked for evidence for
03:10multiverse and have come up short. Like if another neighboring universe intersects with the bubble of
03:18our universe, we might be able to see signals of that. And we haven't seen anything. That doesn't
03:24rule it out yet, but there's no conclusive evidence for it. Even if there were a multiverse,
03:32we would never ever be able to access any of those other universes. We wouldn't be able to visit them.
03:38They wouldn't be able to visit us. For all intents and purposes, they wouldn't exist. So when it comes to
03:46multiverse, whether it exists or not, just focus on our universe because really, it's the only one we got.
03:53called
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