Do We Live In a Multiverse? - video Dailymotion

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8/26/2024

Astrophysicist Paul Sutter explains

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00:00Do we live in a multiverse?

00:04No.

00:05I mean, yes.

00:07I mean, maybe.

00:09Look, it's kind of complicated, and we're not exactly sure.

00:14I'm Paul Sutter, and this is Paul Explains, the show where I, you know, explain.

00:21First, let's define what we mean by multiverse.

00:25We have the universe, which is, by definition, all the things.

00:30It's all the stars, all the planets, all the people and aliens,

00:34it's all the bits of fluff just floating around in the void.

00:38It is the entire thing.

00:40It's all the stuff.

00:42So, in one sense, there's no such thing as the multiverse,

00:46because the universe is already defined to be all the things.

00:50But, maybe there are patches of the universe that have different physics or different realities.

01:01They have different forces or different particles.

01:04And this is what we refer to as the multiverse.

01:09Now, do we live in a multiverse?

01:12Maybe, maybe not.

01:15One of the most promising ways physically to get a multiverse is through something called inflation.

01:24Inflation is our model of one of the earliest and most momentous events in the history of the universe.

01:32In the inflation model, when our universe was barely getting started,

01:37when it was a billionth of a billionth of a billionth of a billionth of a second old,

01:43it became very large.

01:45It went from the size of, say, an atomic nucleus to around the size of a baseball.

01:51And this event has the possibility of never ending.

01:58Of inflation of the universe just always getting bigger and bigger and bigger all the time.

02:05And what we call the universe is just one small pocket of that much larger volume of the true universe.

02:15And in our little pocket, when inflation ended for us,

02:19we ended up with one set of physics and one set of forces and one set of particles and one set of reality.

02:26But past the confines of our little bubble,

02:30the greater universe is still going, still doing its thing, still inflating,

02:35and different pieces of it pinch off on their own with their own physics.

02:40Now, it's possible that inflation can lead to a multiverse.

02:47We don't know if inflation really happened.

02:50We suspect it did, but we're not entirely sure.

02:53And we're not sure if inflation demands the existence of a multiverse.

02:59It's possible that inflation just happened once and did it throughout the universe and that this is it.

03:06Or not.

03:08We've looked for evidence for a multiverse and have come up short.

03:13Like if another neighboring universe intersects with the bubble of our universe,

03:19we might be able to see signals of that.

03:22And we haven't seen anything.

03:24That doesn't rule it out yet, but there's no conclusive evidence for it.

03:30Even if there were a multiverse, we would never ever be able to access any of those other universes.

03:37We wouldn't be able to visit them. They wouldn't be able to visit us.

03:40For all intents and purposes, they wouldn't exist.

03:44So when it comes to multiverse, whether it exists or not,

03:48just focus on our universe because, really, it's the only one we got.

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