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
01:28events 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
01:41a second old, it became very large. It went from the size of, say, an atomic nucleus to around
01:48the size of a baseball. And this event has the possibility of never ending, of inflation of
01:59the universe just always getting bigger and bigger and bigger all the time. And what we call the
02:06universe is just one small pocket of that much larger volume of the true universe. And in our little
02:16pocket, when inflation ended for us, we ended up with one set of physics and one set of forces and
02:23one set of particles and one set of reality. But past the confines of our little bubble,
02:30the greater universe is still going, still doing its thing, still inflating, and different pieces of it
02:37pinch off on their own with their own physics. Now, it's possible that inflation can lead to a
02:46multiverse. We don't know if inflation really happened. We suspect it did, but we're not entirely
02:52sure. And we're not sure if inflation demands the existence of a multiverse. It's possible that
03:00inflation just happened once and did it throughout the universe and that this is it or not. We've looked
03:08for evidence for multiverse and have come up short. Like if, like if another neighboring universe
03:16intersects with the bubble of our universe, we might be able to see signals of that. And we haven't seen
03:22anything. That doesn't rule it out yet, but there's no conclusive evidence for it. Even if there were
03:31a multiverse, we would never ever be able to access any of those other universes. We won't be able to
03:37visit them. They wouldn't be able to visit us. For all intents and purposes, they wouldn't exist. So
03:45when it comes to multiverse, whether it exists or not, just, just focus on our universe because really,
03:51it's the only one we got.
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